Journal of Polymer Science Part A: Polymer Chemistry

Cover image for Vol. 47 Issue 18

15 September 2009

Volume 47, Issue 18

Pages 4469–4845

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      Artificial polymerases and molecular chaperones (pages 4469–4481)

      Akira Harada

      Article first published online: 3 AUG 2009 | DOI: 10.1002/pola.23496

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      Cyclodextrins (CDs) were found to initiate polymerization of lactone to give polyesters with a CD ring at the end of the polymer chain in high yields only by mixing and heating with monomer. CD-tethered polyester propagates with the formation of polypseudo-rotaxane, which is necessary to initiate further polymerization. By polymerizing with CD, switching the activity of the polymerization by photoisomerization was demonstrated. By using the above polymerization system, β-CD nanospheres which initiates the oligomerization of lactone were constructed. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]

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    1. Silver metal nanoparticles: Facile dendrimer-assisted size-controlled synthesis and selective catalytic reduction of chloronitrobenzenes (pages 4482–4493)

      Amy Sutton, Grégory Franc and Ashok Kakkar

      Article first published online: 3 AUG 2009 | DOI: 10.1002/pola.23501

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      3,5-Dihydroxybenzyl alcohol-based dendrimers offer one-pot synthetic methodology to carry out tailored construction of silver metal nanoparticles without any external reducing agent. The resulting metal nanoparticles are excellent catalysts for the selective reduction of chloronitrobenzenes to chloroanilines. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]

    2. Synthesis of well-defined azide-terminated poly(vinyl alcohol) and their subsequent modification via click chemistry (pages 4494–4504)

      Yin-Yin Tong, Rui Wang, Ning Xu, Fu-Sheng Du and Zi-Chen Li

      Article first published online: 3 AUG 2009 | DOI: 10.1002/pola.23502

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      α-Azide-terminated PVAc was prepared via RAFT polymerization of VAc and hydrolyzed to obtain α-azide-terminated PVA, which was further modified via click chemistry with alkynyl compounds to afford PCL-b-PVA, mannose, or pyrene-end-functionalized PVA. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]

    3. Controlled reduction of polypropylene isotacticity and crystallinity by epimerization during reactive processing (pages 4505–4518)

      Gaëtan R. P. Henry, Xavier Drooghaag, Mikhaël Vandeuren, Michel Sclavons, André Schanck, Jacques Devaux, Véronique Carlier and Jacqueline Marchand-Brynaert

      Article first published online: 3 AUG 2009 | DOI: 10.1002/pola.23504

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      Reactive processing of isotactic polypropylene in the presence of peroxides and brominated compounds allows successive random epimerization of the backbone while preserving the molecular weight. These polypropylene elastomers feature random stereoblock microstructures.

    4. Synthesis of quaternary ammonium ion-grafted polyolefins via activation of inert C[BOND]H bonds and nitroxide mediated radical polymerization (pages 4519–4531)

      Tae Soo Jo, Meilong Yang, Lacie V. Brownell and Chulsung Bae

      Article first published online: 3 AUG 2009 | DOI: 10.1002/pola.23505

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      A TEMPO-functionalized isotactic poly(1-butene) macroinitiator was synthesized via rhodium-catalyzed activation of the alkane C[BOND]H bonds in polyolefin side chain using a boron reagent and subsequent transformations of the boronate ester group in the polymer. Nitroxide mediated radical polymerization of dipropyl(4-vinylphenyl)amine with the macroinitiator produced high-molecular-weight amine-grafted copolymers of the polyolefin. Quaternization of the amine-grafted copolymers with methyl triflate generated ammonium ion blocks along the side chain of the graft copolymers. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]

    5. New fluorene-based copolymers containing oxadiazole pendant groups: Synthesis, characterization, and polymer stability (pages 4532–4546)

      Dmitrij Bondarev, Jiří Zedník, Jiří Vohlídal, Klára Podhájecká and Jan Sedláček

      Article first published online: 3 AUG 2009 | DOI: 10.1002/pola.23506

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      A series of fluorene-based copolymers containing hole blocking/electron transporting diphenyloxadiazole units were synthesized. The emission stability of fluorene-based copolymers was improved by the replacement of alkyl groups on the C-9 carbon of flourene with aryl groups or by the incorporation of anthracene units into the copolymer main chain. A comparison of luminescence properties of pristine and annealed thin layers of studied copolymers was performed.

    6. Facile method to prepare monodispersed Ag/polystyrene composite microspheres and their properties (pages 4547–4554)

      Xinjian Cheng, Sie Chin Tjong, Qiang Zhao and Robert K. Y. Li

      Article first published online: 3 AUG 2009 | DOI: 10.1002/pola.23507

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      This article provided a very facile route to fabricate Ag/PS composite microspheres. In this approach, PVP acted both stabilizer and reductant, no further reducing agent to reduce silver precursors to zero-valent particles was needed. The resulted Ag/PS composite microspheres demonstrated excellent catalytic performance and SERS properties.

    7. Synthesis, characterization, and electroluminescence of novel copolyfluorenes and their applications in white light emission (pages 4555–4565)

      Ping Wang, Hao Jin, Qian Yang, Wanli Liu, Zhihao Shen, Xiaofang Chen, Xinghe Fan, Dechun Zou and Qifeng Zhou

      Article first published online: 4 AUG 2009 | DOI: 10.1002/pola.23508

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      New copolyfluorenes with different content of jacketed units were synthesized and characterized. The EL emissions of copolymers were pure blue and low-energy excimer emission bands were successfully suppressed. The maximum brightness and efficiency of the PC8OF25 surpassed those of PC8OF0 under three devices. Moreover, the EL devices of blends from PC8OF25 and IrMDPP exhibited near white light emission under different operating voltages. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]

    8. Oriented and low-density tin dioxide film by sol–gel mineralizing tin-contained hydroxypropyl cellulose lyotropic liquid crystal for laser-induced extreme ultraviolet emission (pages 4566–4576)

      Keiji Nagai, Qincui Gu, Yuzuri Yasuda, Takayoshi Norimatsu, Shinsuke Fujioka, Hiroaki Nishimura, Noriaki Miyanaga, Yasukazu Izawa and Kunioki Mima

      Article first published online: 4 AUG 2009 | DOI: 10.1002/pola.23509

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      The submicro crystalline tin dioxide (SnO2) with various morphologies was prepared by sol–gel mineralizing the tin-contained hydroxypropyl cellulose (HPC) lyotropic liquid crystal film. The mineralization would not happen during the gelation process but the calcinations process of HPC-Sn gel. The obtained SnO2 morphology was different from the HPC-Sn gel, and was dependent on the HPC content and the phase structure of the hybrid was considered to be responsible for the various morphologies. A relatively monochromatic and strong extreme ultraviolet (EUV) emission was observed by irradiating 1064 nm laser focused to 1010 W/cm2.

    9. Two-dimensionally extended aromatic polyamines for optimization of charge-transporting properties by partial oxidation (pages 4577–4586)

      Tsuyoshi Michinobu, Fumiaki Kato, Jun Inui and Hiroyuki Nishide

      Article first published online: 4 AUG 2009 | DOI: 10.1002/pola.23510

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      Hole-transporting properties of the two-dimensionally extended and cross-conjugated aromatic polyamines, prepared by the palladium-catalyzed polycondensation between the tri-sec-amine monomer and p-phenylenediamine-based dibromides, were significantly changed by partial oxidation. It was revealed that the oxidation lowers the injection barrier, but it also generates the hole-trapping sites. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]

    10. Mapping the characteristics of the radical ring-opening polymerization of a cyclic ketene acetal towards the creation of a functionalized polyester (pages 4587–4601)

      Peter Plikk, Therese Tyson, Anna Finne-Wistrand and Ann-Christine Albertsson

      Article first published online: 4 AUG 2009 | DOI: 10.1002/pola.23511

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      The free radical polymerization of the cyclic ketene acetal monomer 2-methylene-1,3-dioxe-5-pene yields oligomers comprised of both ring-opened and ring-retained repeating units as the main product at lower reaction temperatures. The ratio of ring-opening is increased when the reaction temperature is increased. Due to the stability of the allylic radical, propagation is inhibited, and the main product at high temperatures is 3-vinyl-1,4-butyrolactone formed by an intramolecular cyclization reaction.

    11. Star-like polyurethane hybrids with functional cubic silsesquioxanes: Preparation, morphology, and thermomechanical properties (pages 4602–4616)

      Khine Y. Mya, Yinxia Wang, Lu Shen, Jianwei Xu, Yongling Wu, Xuehong Lu and Chaobin He

      Article first published online: 4 AUG 2009 | DOI: 10.1002/pola.23512

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      Star-like polyurethane (PU) hybrid films containing octafunctional cubic silsesquioxanes were synthesized by polyaddition reaction. The enrichment of octafunctional silsesquioxane in PU hybrid film provided the improvement in thermal stability and crosslink density, and subsequently improved oxidation resistance and mechanical strength. AFM images revealed a highly intermingled, homogeneous distribution and no phase separation in the macroscopic level.

    12. Modification of silica nanoparticles by grafting of copolymers containing organosilane and fluorine moities (pages 4617–4628)

      Francis Pardal, Vincent Lapinte and Jean-Jacques Robin

      Article first published online: 4 AUG 2009 | DOI: 10.1002/pola.23513

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      After the free-radical cotelomerization of 3-(trimethoxysilyl)propyl methacrylate (TMSPMA) with 1,1,2,2-tetrahydroperfluorodecyl acrylate (PFDA) in the presence of 2-mercaptoethanol, the P(TMSPMA-stat-PFDA) cotelomers, containing fluoro and silane groups, were grafted onto silica nanoparticles. The article focuses on the characterization of the structure of the modified silica by FTIR and 29Si solid-state NMR as well as the detailed calculations of the amount of grafted P(TMSPMA-stat-PFDA) from thermogravimetric and elemental analyzes. [Color figure can be viewed in the online issue, which is availabe at www.interscience.wiley.com.]

    13. Polyaddition of bifunctional cyclic carbonate with diamine in ionic liquids: In situ ion composite formation and simple separation of ionic liquid (pages 4629–4635)

      Bungo Ochiai, Yuriko Satoh and Takeshi Endo

      Article first published online: 4 AUG 2009 | DOI: 10.1002/pola.23514

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      Polyaddition of bifunctional cyclic carbonates and diamines in ionic liquids proceeded smoothly to afford polyurethanes having hydroxyl groups in the side chain (i.e., poly(hydroxyurethane)). The reaction mixtures separated into ionic liquids and ionic composites consisting of poly(hydroxyurethane) and ionic liquids. The ionic composites originated from the interactions between hydroxyl groups in the side chains and the ionic liquids, confirmed by IR spectroscopic analysis. When the polyaddition was conducted in the mixed solvent consists of water and N-n-butylimidazolium hexafluorophosphate. After the reaction, the polymer and the ionic liquid could be separated easily.

    14. Three-cationic carbocyanine dyes as sensitizers in very efficient photoinitiating systems for multifunctional monomer polymerization (pages 4636–4654)

      Janina Kabatc and Jerzy Pączkowski

      Article first published online: 4 AUG 2009 | DOI: 10.1002/pola.23515

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      New three-cationic carbocyanine dyes coupled with n-butyltriphenylborate anions (SB2, OB2, IB2) were tested as visible-light photoinitiators of acrylic monomers polymerization. They show significantly enhanced photoinitation ability in comparison to their monocationic analogue. This is attributed to an artificially increased concentration of the n-butyltriphenylborate anion (acting as electron donor), in proximity to the electron accepting excited cyanine dye chromophore.

    15. Synthesis and characterization of a poly(GMA)-graft-poly(Z-L-lysine) graft copolymer with a rod-like structure (pages 4655–4669)

      You-Liang Tu, Cheng-Chien Wang and Chuh-Yung Chen

      Article first published online: 4 AUG 2009 | DOI: 10.1002/pola.23516

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      Synthesis of graft copolymer poly(GMA)-graft-poly(Z-L-lysine)

    16. Synthesis of amphiphilic cationic copolymers poly[2-(methacryloyloxy)ethyl trimethylammonium chloride-co-stearyl methacrylate] and their self-assembly behavior in water and water-ethanol mixtures (pages 4670–4684)

      Guixiang Sun, Mingzu Zhang, Jinlin He and Peihong Ni

      Article first published online: 4 AUG 2009 | DOI: 10.1002/pola.23517

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      A series of amphiphilic cationic random copolymers, namely poly[2-(methacryloyloxy)ethyl trimethylammonium chloride-co-stearyl methacrylate], have been synthesized via conventional free-radical copolymerization. They can self-assemble into various morphologies, such as spherical micelles, spherical vesicles as well as rod-like micelles, depending on the copolymer composition and the solvents, such as water or mixed water-ethanol solvent. These results indicate that the ill-defined random copolymers are able to have high surface activity and well self-assembly behavior. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]

    17. Self-assembly of H-bonded side-chain and cross-linking copolymers containing diblock-copolymeric donors and single/double H-bonded light-emitting acceptors (pages 4685–4702)

      Hong-Cheu Lin, Meng-Dan Jiang, Shen-Chang Wu, Leng-Long Jou, Kai-Pin Chou, Ching-Mao Huang and Kung-Hwa Wei

      Article first published online: 4 AUG 2009 | DOI: 10.1002/pola.23521

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      A series of diblock-copolymers were synthesized through anionic polymerization of styrene and tert-butyl methacrylate (tBuA) with different monomer ratios, and analogous block-copolymeric derivatives (PS-b-PAA)s with monofunctional carboxylic acid groups were obtained by further hydrolyzation as hydrogen-bonded (H-bonded) proton donors. Self-assembled phenomena of amphiphilic dibolck copolymers and their H-bonded complexes were confirmed by TEM micrographs, and supramolecular microphase separation of spherical micelle-like morphology was demonstrated to affect the photophysical properties. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]

    18. A kinked unit-containing thermotropic liquid crystalline copolyester with low glass transition temperature and broad phase transition temperature (pages 4703–4709)

      Heng-Zhen Huang, Li Chen and Yu-Zhong Wang

      Article first published online: 4 AUG 2009 | DOI: 10.1002/pola.23524

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      A novel phosphorus-containing thermotropic liquid crystalline copolyester (PHDDT) with kinked unit was synthesized by melting transesterification from terephthalic acid (TPA), p-hydroxybenzoic acid (p-ABH), 2-(6-oxid-6H-dibenz(c,e) (1,2) oxaphosphorin 6-yl)1,4-benzenediol (DOPO-HQ), and 4,4′-dihydroxydiphenyl ether (DOP). PHDDTs exhibited the typical nematic mesophase occurred in temperature range from 230 °C to higher than 400 °C, and had low glass transition temperature ranging from 154.5 to 166.9 °C. They will find an extensive application in preparing various in situ reinforced polymer materials with excellent mechanical properties and flame retardancy. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]

    19. Iodine transfer copolymerization of vinylidene fluoride and α-trifluoromethacrylic acid in emulsion process without any surfactants (pages 4710–4722)

      Cyrille Boyer and Bruno Améduri

      Article first published online: 4 AUG 2009 | DOI: 10.1002/pola.23525

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      The polymerization of vinylidene fluoride (VDF), hydrophobic monomer, was carried out in emulsion process without addition of surfactant using iodine transfer polymerization. The incorporation of α-trifluoromethacrylic acid (TFMA) units in the poly(VDF) by copolymerization allows to improve the stability of these emulsions. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]

    20. A novel type of optically active helical liquid crystalline polymers: Synthesis and characterization of poly(p-phenylene)s containing terphenyl mesogen with different terminal groups (pages 4723–4735)

      Lie Chen, Yiwang Chen, Kai Yao, Weihua Zhou, Fan Li, Liping Chen, Rongrong Hu and Ben Zhong Tang

      Article first published online: 5 AUG 2009 | DOI: 10.1002/pola.23526

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      Series of poly(p-phenylene)s (PPPs) containing terphenyl mesogenic side chain with different terminal groups (-([BOND]CN and [BOND]-OCH3) are synthesized by Yamamoto polycondensation with Ni-based complex catalysts. The terphenyl mesogen endows the monomers and their polymers with good liquid crystallinity. Photoexcitation of their solutions induces strong blue light emission. The photoluminescence is influenced by the electron-withdrawing nature of the terminal substituent and the existence of donor–acceptor pairs. The bulky terphenyl mesogen exerts great influence on the conformation of the skeleton. Without introducing any chiral groups, the bulky mesogen orientating around the backbone forces the backbone with helical conformation in the long region. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]

    21. Synthesis of four-arm star poly(L-lactide) oligomers using an in situ-generated calcium-based initiator (pages 4736–4748)

      Karina A. George, François Schué, Traian V. Chirila and Edeline Wentrup-Byrne

      Article first published online: 5 AUG 2009 | DOI: 10.1002/pola.23527

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      The bulk polymerization of poly(L-lactide) stars where both the core molecule and initiator are insoluble in molten L-lactide relies on the surface reaction of the insoluble particles to create an alkoxide which reacts with L-lactide to produce a polymerizable soluble species. However, the polymerization reaction can result in a situation, observed only for small star polymers (theoretical molecular weight of 2000 g/mol), where the maximum conversion of L-lactide occurs before complete reaction of the pentaerythritol molecules. This results in greater molecular weights than predicted. In contrast, the polymerization of larger stars proceeds via a pseudoliving mechanism.

    22. Synthesis and photoisomerization of poly(1-methylpropargyl ester)s carrying azobenzene moieties (pages 4749–4761)

      Jinqing Qu, Feng Jiang, Huanqin Chen, Fumio Sanda and Toshio Masuda

      Article first published online: 5 AUG 2009 | DOI: 10.1002/pola.23528

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      Optically active 1-methylpropargyl esters bearing azobenzene groups 1-3 were synthesized and polymerized with Rh+(nbd)[η6-C6H5B(C6H5)3] (nbd = norbornadiene) as a catalyst to afford the corresponding poly(1-methyloropargylester)s with moderate molecular weights (Mn = 24,000–31,300) in good yields (79–84%). All these polymers take a helical structure with a predominantly one-handed screw sense. The geometric change induced by isomerization of trans-azobenzene to cis-azobenzene causes in some cases drastic conformational changes of the polymer backbone.

    23. Membranes from poly(aryl ether)-based ionomers containing multiblock segments of randomly distributed nanoclusters of 18 sulfonic acid groups (pages 4762–4773)

      Shuanghong Tian, Yuezhong Meng and Allan S. Hay

      Article first published online: 10 AUG 2009 | DOI: 10.1002/pola.23529

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      A sulfonated poly(aryl ether) containing randomly distributed nanoclusters of 18 sulfonic acid groups was prepared in this paper. These ionomers, where the hydrophilic block is a tight cluster of 18 SO3H groups, can be considered to behave like block copolymers. The membranes exhibited spherical ionic clusters with relatively uniform size that were well-dispersed throughout the membrane, similar to Nafion® 117. Significantly phase-separated morphologies resulted in high proton conductivity comparable to Nafion at the IEC values comparable to Nafion. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley. com.]

    24. Controlled synthesis of poly(dimethylsiloxane) homopolymers using high-vacuum anionic polymerization techniques (pages 4774–4783)

      Mario D. Ninago, Angel J. Satti, Jorge A. Ressia, Andrés E. Ciolino, Marcelo A. Villar and Enrique M. Vallés

      Article first published online: 5 AUG 2009 | DOI: 10.1002/pola.23530

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      The synthesis of poly(dimethylsiloxane) (PDMS) using D3 monomer, a mixture of ciclohexane/THF 50/50 v/v as solvent, and sec-BuLi+ as initiator was studied. For PDMS with molar masses below 100,000 g/mol, high conversion (>90%) and Mw/Mn < 1.1 can be achieved at long reaction times (>24 h) and mild conditions (from room temperature up to 30 °C). On the other hand, to synthesize PDMS with molar masses higher than 100,000 g/mol and Mw/Mn < 1.1 increasing temperature (50 °C) and decreasing reaction time (8 h) will favour the reaction (up to 65–70% conversion is achieved).

    25. A wide band gap polymer derived from 3,6-carbazole and tetraphenylsilane as host for green and blue phosphorescent complexes (pages 4784–4792)

      Teng Fei, Gang Cheng, Dehua Hu, Ping Lu and Yuguang Ma

      Article first published online: 5 AUG 2009 | DOI: 10.1002/pola.23532

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      The synthesis and properties of a novel wide band gap polymer P36HCTPSi derived from 3,6-carbazole and tetraphenylsilane are investigated. The polymer exhibits a violet emission with a peak at 392 nm in solution, and the band gap estimated from the onset of its absorption is 3.26 eV. Highly efficient green and blue phosphorescent polymer light-emitting devices are realized by using P36HCTPSi as a host for iridium complexes, the maximum luminous efficiencies for green and blue devices are 27.6 and 3.4 cd/A, respectively. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]

    26. Sequential photodecomposition of bisacylgermane type photoinitiator: Synthesis of block copolymers by combination of free radical promoted cationic and free radical polymerization mechanisms (pages 4793–4799)

      Yasemin Yuksel Durmaz, Manolya Kukut, Norbert Moszner and Yusuf Yagci

      Article first published online: 5 AUG 2009 | DOI: 10.1002/pola.23533

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      The synthesis of block copolymers by sequential photodecomposition of dibenzoyldiethylgermane (DBDEG), using a combination of free radical promoted cationic and free radical polymerization processes, was demonstrated. The bifunctionality of the photoinitiator pertains to the sequential photodecomposition of DBDEG through acyl germane bonds. In the first step, photoinitiated free radical promoted cationic polymerization of CHO using DBDEG in the presence of diphenyliodonium hexafluorophosphate (Ph2I+PFmath image) was carried out to yield polymers with photoactive monobenzoyl germane end groups. These poly(cyclohexene oxide) (PCHO) prepolymers were used to induce photoinitiated free radical polymerization of styrene (St) resulting in the formation of poly(cyclohexene oxide-block-styrene).

    27. Synthesis of dendrimer-like copolymers based on the star[Polystyrene-Poly(ethylene oxide)-Poly(ethoxyethyl glycidyl ether)] terpolymers by click chemistry (pages 4800–4810)

      Guowei Wang, Xiaolan Luo, Yannan Zhang and Junlian Huang

      Article first published online: 5 AUG 2009 | DOI: 10.1002/pola.23534

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      The dendrimer-like [PEEGE-(PS/PEO)]n(n ≥ 2) copolymers based on star(PS-PEO-(PEEGE-Alkyne) terpolymers were synthesized by click chemistry. The small molecule DAB with two azide groups and PTAB with four azide groups were designed and used as the coupling agent, respectively. Specially, in the latter case, it was confirmed that the [PEEGE-(PS/PEO)]3 was the main product due to the steric effect. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]

    28. Chlorotitanium (IV) tetradentate Schiff-base complex immobilized on inorganic supports: Support type and other factors having effect on ethylene polymerization activity (pages 4811–4821)

      Marzena BiaŁek, Anna GarŁowska and Ozanna Liboska

      Article first published online: 5 AUG 2009 | DOI: 10.1002/pola.23537

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      Ethylene was polymerized using a titanium complex with [O,N,N,O]-type tetradentate Schiff base immobilized on silica- and magnesium-type carriers. Catalyst based on the carrier produced in the reaction of MgCl2·3.4EtOH with Et2AlCl turned out to be the most active one, especially in conjunction with Me3Al, within the support systems tested. Its activity increases with the increasing reaction temperature. Moreover, that catalyst does not undergo deactivation over the studied period of time, irrespective of the type of the activator used and of the process temperature.

    29. Synthesis of imidazole-containing conjugated polymers bearing phenol unit as side group and excited state intramolecular proton transfer-mediated fluorescence (pages 4822–4829)

      Koji Takagi, Kenta Sugihara and Takato Isomura

      Article first published online: 5 AUG 2009 | DOI: 10.1002/pola.23539

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      A new family of imidazole-containing conjugated polymer was prepared, in which phenol unit was located at 2-position of imidazole. The relationship between intramolecular hydrogen bonding and fluorescence behavior was elucidated by UV and PL spectroscopy in view of excited-state intramolecular proton transfer (ESIPT). [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]

    30. Helically chiral poly(quinoxalin-2,3-diyl)s: Toward the synthesis of stereoregular polymeric organocatalysts (pages 4830–4839)

      Michael Reggelin, Johannes Scholz and Manuel Hamburger

      Article first published online: 5 AUG 2009 | DOI: 10.1002/pola.23540

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      The synthesis of several new functionalized diisocyanides and their palladium complex mediated helix-sense selective polymerization is described. A beneficial effect of microwave irradiation on the polymerization rate was observed. In the resulting optically active polymers Brønsted acidic as well as basic moieties are attached to configurationally labile biaryl axes being under stereochemical influence of the stereoregular helical backbone. Their chiroptical properties were investigated by CD-spectroscopy. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]

  3. Rapid Communication

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    2. Highlight
    3. Articles
    4. Rapid Communication
    1. You have free access to this content
      Enhancing hydrophilicity in a hydrophobic porous emulsion-templated polyacrylate (pages 4840–4845)

      Shulamit Livshin and Michael S. Silverstein

      Article first published online: 5 AUG 2009 | DOI: 10.1002/pola.23522

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      A porous, hydrophilic monolith was produced from an emulsion-templated, porous, hydrophobic monolith that was synthesized through the polymerization of t-butyl acrylate in the external phase of a high internal phase emulsion (HIPE). The hydrolysis of the t-butyl groups to carboxylic acid groups resulted in a significant enhancement in wetting by water. Although the as-synthesized hydrophobic polyHIPE did not absorb water, the hydrolyzed polyHIPE rapidly absorbed nearly 700 wt %.

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