Journal of Polymer Science Part A: Polymer Chemistry

Cover image for Vol. 44 Issue 13

1 July 2006

Volume 44, Issue 13

Pages 3947–4250

  1. Articles

    1. Top of page
    2. Articles
    3. Rapid Communications
    4. Notes
    1. Heteroarm H-shaped terpolymers through the combination of the Diels–Alder reaction and controlled/living radical polymerization techniques (pages 3947–3957)

      Hakan Durmaz, Figen Karatas, Umit Tunca and Gurkan Hizal

      Article first published online: 8 MAY 2006 | DOI: 10.1002/pola.21499

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      Heteroarm H-shaped terpolymers (PS)(PtBA)–PEO–(PtBA)(PS) and (PS)(PtBA)–PPO–(PtBA)(PS) [where PS is polystyrene, PtBA is poly(tert-butyl acrylate), PEO is poly(ethylene oxide), and PPO is poly(propylene oxide)], containing PEO or PPO as a backbone and PS and PtBA as side arms, were prepared via a combination of the Diels–Alder reaction and atom transfer radical and nitroxide-mediated radical polymerization routes. The H-shaped terpolymers had moderately low molecular weight distributions (<1.31). The polymers were characterized with 1H NMR, ultraviolet, gel permeation chromatography, and differential scanning calorimetry.

    2. Synthesis and characterization of new polymeric ionic liquid microgels (pages 3958–3965)

      Rebeca Marcilla, Marta Sanchez-Paniagua, Beatriz Lopez-Ruiz, Enrique Lopez-Cabarcos, Estibalitz Ochoteco, Hans Grande and David Mecerreyes

      Article first published online: 8 MAY 2006 | DOI: 10.1002/pola.21483

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      The synthesis of different polymeric ionic liquid microgels, via a water-in-oil concentrated emulsion polymerization followed by an anion-exchange step, is presented. The main advantage is access to a great variety of microgels from only one polymerized monomer. These polymeric ionic liquid microgels present different physicochemical characteristics, such as swelling ability in different media, depending on the chemical nature of the counteranion. As an application, the immobilization of glucose oxidase inside these microgels and their use as the biological component of an amperometric glucose sensor are reported.

    3. Thermal dissociation behavior of copolymers bearing hemiacetal ester moieties and their reactions with epoxides (pages 3966–3977)

      Hiroyuki Komatsu, Tetsuo Hino and Takeshi Endo

      Article first published online: 10 MAY 2006 | DOI: 10.1002/pola.21503

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      The thermally latent dissociation behavior of novel copolymers carrying hemiacetal esters prepared by the radical polymerization of 1-propoxyethyl methacrylate with various vinyl monomers was examined. These copolymers, having hemiacetal ester moieties, thermally released vinyl ether to transform into poly(methacrylic acid) derivatives, which could thermally latently add to glycidyl phenyl ether to afford the corresponding polymers with hydroxyl groups.

    4. Glycoconjugated polymer: Synthesis and characterization of poly(vinyl saccharide)-block-polystyrene-block-poly(vinyl saccharide) as an amphiphilic ABA triblock copolymer (pages 3978–3985)

      Atsushi Narumi, Issei Otsuka, Takeshi Matsuda, Yutaka Miura, Toshifumi Satoh, Noriaki Kaneko, Harumi Kaga and Toyoji Kakuchi

      Article first published online: 12 MAY 2006 | DOI: 10.1002/pola.21495

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      Amphiphilic ABA triblock copolymers composed of polystyrene and poly(vinyl saccharide)s, such as poly(4-vinylbenzyl glucoside) and poly(4-vinylbenzyl maltohexaoside), are described. The glycoconjugated triblock copolymer was synthesized by the two-step 2,2,6,6-tetramethylpiperidiloxy (TEMPO)-mediated controlled radical polymerization of styrene and the corresponding vinyl saccharides with the difunctional TEMPO initiator, followed by deacetylation.

    5. Synthesis, photochemical and phase behavior of linear and hyperbranched photoactive benzylidene liquid-crystalline polyesters (pages 3986–3994)

      M. Murali and A. B. Samui

      Article first published online: 16 MAY 2006 | DOI: 10.1002/pola.21501

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      Photoactive hyperbranched benzylidene liquid-crystalline polyester (PAHBP) and photoactive linear benzylidene liquid-crystalline polyester (PALBP) were synthesized, and their photochemical and phase behavior were compared. The hyperbranched polymer exhibited higher thermal stability than the linear polymer. The glass-transition temperature and liquid-crystalline temperature ranges of PAHBP were higher than those of PALBP. During photolysis under ultraviolet light, both polymers underwent intermolecular photocycloaddition reaction, and the rate of photocrosslinking of the hyperbranched polymer was faster than the rate of the linear one.

    6. Synthesis and properties of polyimides bearing acid groups on long pendant aliphatic chains (pages 3995–4005)

      Tomohiro Yasuda, Yi Li, Kenji Miyatake, Michiko Hirai, Masato Nanasawa and Masahiro Watanabe

      Article first published online: 12 MAY 2006 | DOI: 10.1002/pola.21509

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      A series of novel polyimide electrolytes having long pendant acidic groups were synthesized for fuel-cell applications. Sulfodecyloxy-, phosphodecyloxy-, and sulfophenoxydodecyloxy-substituted benzidine monomers were copolymerized with naphthalene tetracarboxylic dianhydride and fluorenylidene dianiline to give the corresponding polyimides. A flexible, ductile, and self-standing membrane was obtained. Because the acid groups were on long pendant side chains and away from the main chains, the polyimide membrane showed improved oxidative and hydrolytic stability in comparison with the polyimides with sulfonic acid groups on the main chains or on the short side chains. The polyimide membrane displayed high proton conductivity of 10−1 S cm−1 at 120 °C.

    7. New chiral [N,N,N]-ligand containing titanium/zirconium precatalysts for 1-hexene polymerization (pages 4006–4014)

      Padmanabhan Sudhakar and Govindarajan Sundararajan

      Article first published online: 12 MAY 2006 | DOI: 10.1002/pola.21502

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      A titanium catalyst bearing a chiral [N,N,N]-ligand, 1-TiCl2/methylaluminoxane, was moderately active toward polymerizing 1-hexene with high isospecificity. The enantiomerically pure and racemic forms of the catalysts behaved differently in polymerizing 1-hexene. The enantiomerically pure catalyst form gave polyhexene that had a unimodal gel permeation chromatography curve with a narrow polydispersity index, which was indicative of the single-site behavior of the catalysts, but the racemic catalyst afforded polyhexenes having bimodal molecular weight distributions with high dispersities. On the basis of an Arrhenius plot (the natural logarithm of the number-average molecular weight vs the reciprocal of the temperature) and NMR evidence, we tentatively proposed catalyst aggregation to explain this observation.

    8. Polyfluorenes containing tetraphenylthiophene segments: Synthesis, photophysics, and electroluminescence (pages 4015–4026)

      John A. Mikroyannidis

      Article first published online: 12 MAY 2006 | DOI: 10.1002/pola.21500

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      A new series of soluble, statistical copolyfluorenes containing tetraphenylthiophene (TPT) segments along the backbone were synthesized via a nickel-mediated coupling reaction. The emitted color of the polymer thin films could be changed between blue and green (419–521 nm) by the variation of the TPT content of the polymers. The polymer that contained 5mol % TPT was the most luminescent, and its photoluminescence quantum yields in a solution and a thin film were 1.1 and 1.8 times higher, respectively, than those of poly(9,9-dihexylfluorene) (PF). In addition, the light-emitting diode of this polymer emitted blue-green light with a brightness ∼8 times higher than that of PF. Finally, the copolymer with a TPT fraction of 50 mol % emitted pure blue light with a maximum at 419 nm.

    9. Living radical emulsion polymerization using the nanoprecipitation technique: An extension to atom transfer radical polymerization (pages 4027–4038)

      Delphine Chan-Seng and Michael K. Georges

      Article first published online: 12 MAY 2006 | DOI: 10.1002/pola.21506

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      The atom transfer radical polymerization of styrene under emulsion polymerization with nanoprecipitation was conducted. This technique consisted of the preparation of an oligostyrene in bulk and dissolution in acetone with the appropriate copper metal, that is, copper(I) bromide, and a ligand, that is, N,N-bis(2-pyridylmethyl)octadecylamine, into a solution of a surfactant in water to form the polymer particles. The influence of several factors, such as the size of the oligostyrene and the different ingredients of the system, on the livingness of the polymerization and the stability of the latexes was examined. Latexes with good colloidal stability were obtained.

    10. Cyclolinear polysiloxanes. I. Synthesis and characterization (pages 4039–4052)

      J. Daum, G. Erdodi and J. P. Kennedy

      Article first published online: 16 MAY 2006 | DOI: 10.1002/pola.21497

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      The synthesis and characterization of two novel cyclic siloxanes, diacetoxydiethyltetramethylcyclotetrasiloxane anddiacetoxytriethylpentamethylcyclopentasiloxane, and polymers synthesized from these monomers are presented. The cyclic siloxanes were self-condensed into cyclolinear polymers and cocondensed with silanol-terminated polydimethylsiloxane into polymers containing cyclic units and linear polydimethylsiloxane spacers.

    11. Cyclolinear polysiloxanes. II. Crosslinking and characterization (pages 4053–4062)

      J. Daum, G. Erdodi and J. P. Kennedy

      Article first published online: 16 MAY 2006 | DOI: 10.1002/pola.21496

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      This article describes the synthesis and characterization of two novel families of networks prepared by crosslinking via the hydrosilation of (1) vinyl-terminated cyclolinear polysiloxanes and (2) vinyl-terminated extended cyclolinear polysiloxanes. In both cases, the crosslinking/hydrosilating agent was a commercially available copolymer of dimethylsiloxane and methylhydrosiloxane. The thermal properties, oxygen permeabilities, and mechanical properties of these networks were investigated.

    12. Synthesis and characterization of new aromatic polyamides bearing crown ethers or their dipodal counterparts in the pendant structure. II. Benzo-15-crown-5 and ortho-bis[2-(2-ethoxyethoxy)ethoxy]benzene (pages 4063–4075)

      Verónica Calderón, Félix García, José L. De la Peña, Eva M. Maya, Ángel E. Lozano, José G. de la Campa, Javier de Abajo and José Miguel García

      Article first published online: 12 MAY 2006 | DOI: 10.1002/pola.21510

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      This work describes the synthesis and characterization of 10 new aromatic polyisophthalamides containing benzo-15-crown-5 substructures and comparable acyclic oxyethylene dipodal sequences. Differences in the volume and conformational restrictions between the pendant crown ether moieties and the linear oligooxyethylene arms significantly influenced the synthesis and properties of the polymers. The thermal and mechanical properties of the polyamides, as well as their solubility and water uptake, were studied, with particular attention being paid to the backbone polyamide structure and to the pendant crown or podal substructure.

    13. Synthesis of laterally attached side-chain liquid-crystalline polynorbornenes with high mesogen density by ring-opening metathesis polymerization (pages 4076–4087)

      Coleen Pugh, Pukun Zhu, Guehyun Kim, Joe X. Zheng, Michael J. Rubal and Stephen Z. D. Cheng

      Article first published online: 12 MAY 2006 | DOI: 10.1002/pola.21511

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      (±)-exo,endo-5,6-Bis{[[11′-[2″,5″-bis[2-(3′-fluoro-4′-n-alkoxyphenyl)ethynyl]phenyl]undecyl]oxy]carbonyl}bicyclo[2.2.1]hept-2-enes were polymerized by ring-opening metathesis polymerization with Mo(CHCMe2Ph)(N-2,6-iPr2Ph)(OtBu)2 as the initiator. In contrast to polynorbornenes doubly substituted with terminally attached mesogens, doubling the density of mesogens per repeat unit did not stabilize smectic ordering in laterally attached side-chain liquid-crystalline polynorbornenes.

    14. Effect of an alkyl substituted in salen ligands on 1,4-Cis selectivity and molecular weight control in the polymerization of 1,3-butadiene with (salen)Co(II) complexes in combination with methylaluminoxane (pages 4088–4094)

      Kiyoshi Endo, Takahiro Kitagawa and Kenji Nakatani

      Article first published online: 12 MAY 2006 | DOI: 10.1002/pola.21494

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      The effect of an alkyl substituted in the aromatic ring of the salen ligand on the polymerization of butadiene (Bd) with (salen)Co(II) complexes in combination with methylaluminoxane (MAO) was investigated. The introduction of bulky substituents such as t-butyl at the 3,3′-position of the salen ligand was an important factor in achieving both high activity and high 1,4-cis selectivity in the polymerization of Bd with (salen)Co(II) complexes in combination with MAO.

    15. Blue-light-emitting and anodically electrochromic materials of new wholly aromatic polyamides derived from the high-efficiency chromophore 4,4′-dicarboxy-4″-methyltriphenylamine (pages 4095–4107)

      Guey-Sheng Liou, Nan-Kun Huang and Yi-Lung Yang

      Article first published online: 16 MAY 2006 | DOI: 10.1002/pola.21505

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      A series of organosoluble, wholly aromatic polyamides were synthesized from a 4-methyl-substituted, triphenylamine-containing, aromatic diacid monomer, 4,4′-dicarboxy-4″-methyltriphenylamine, which is a blue-light (454-nm) emitter with a fluorescence quantum efficiency of 46%. These triphenylamine-based, high-performance polymers had strong fluorescence emissions in the blue region with high quantum yields up to 64% and one reversible oxidation redox couple around 1.20 V versus Ag/AgCl in acetonitrile solutions.

    16. Synthesis and photoluminescent and electrochromic properties of aromatic poly(amine amide)s bearing pendent N-carbazolylphenyl moieties (pages 4108–4121)

      Guey-Sheng Liou, Hwei-Wen Chen and Hung-Ju Yen

      Article first published online: 18 MAY 2006 | DOI: 10.1002/pola.21517

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      A series of novel poly(amine amide)s with pendent N-carbazolylphenyl units were prepared. These aromatic poly(amine amide)s had useful levels of thermal stability associated with relatively high glass-transition temperatures (268–331 °C). The aromatic–aliphatic poly(amine amide)s showed high optical transparency and exhibited violet-to-blue emissions in the solid state. The hole-transporting and electrochromic properties were examined with electrochemical and spectroelectrochemical methods. Thin films of all the obtained poly(amine amide)s revealed reversible electrochromic behavior, with a color change from yellow to green and then to a blue oxidized form at applied potentials ranging from 0.00 to 1.45 V.

    17. Continuous reaction system to investigate the dispersion polymerization of vinyl monomers in supercritical carbon dioxide (pages 4122–4135)

      Alberto Giaconia, Giuseppe Filardo, Onofrio Scialdone and Alessandro Galia

      Article first published online: 23 MAY 2006 | DOI: 10.1002/pola.21513

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      A laboratory-scale continuous reaction system suited to perform the heterogeneous polymerization of vinyl monomers in supercritical carbon dioxide (scCO2) was assembled in our laboratory. The apparatus was equipped with a stirred tank reactor and used to study the dispersion polymerization of methyl methacrylate in scCO2 at 65 °C and 25 MPa with 2,2′-azobisisobutyronitrile as the initiator and a reactive polysiloxane macromonomer as a surfactant. Experiments were designed to investigate the effect of the mean residence time of the reaction mixture on the monomer conversion, polymerization rate, polymer molecular weight, and particle size distribution.

    18. Catalytic chain-transfer synthesis of 1,1,2,2-tetrahydroperfluoroalkyl methacrylate macromonomers (pages 4136–4141)

      Timothy J. Romack, Gurpreet Kaur, Seth F. Weaver, Sarah K. Harrelson and Angela G. Kenward

      Article first published online: 18 MAY 2006 | DOI: 10.1002/pola.21466

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      The successful catalytic chain-transfer synthesis of 1,1,2,2-tetrahydroperfluoroalkyl methacrylate macromonomers with [bis(aqua)bis(difluoroboryl)dimethylglyoximato]cobalt(II) as a catalyst is reported. Fluoroalkyl methacrylate macromonomers were synthesized in acetone with 2,2′-azobisisobutyronitrile as the initiator.

    19. Multistep and semibatch nitroxide-mediated controlled free-radical emulsion polymerization: A significant step toward conceivable industrial processes (pages 4142–4153)

      Julien Nicolas, Bernadette Charleux and Stéphanie Magnet

      Article first published online: 18 MAY 2006 | DOI: 10.1002/pola.21519

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      Batch and semibatch nitroxide-mediated controlled free-radical seeded emulsion polymerizations of styrene and n-butyl acrylate were performed with monofunctional and difunctional, water-soluble SG1-based alkoxyamines. The latexes were very stable with well-defined polymer in the particles. The process definitely opens the door to industrial applications.

    20. Bipyridinophane-containing conjugated polymers modulated with an intramolecular aromatic C[BOND]H/π interaction (pages 4154–4164)

      Wei-Ling Wang, Jian-Wei Xu and Yee-Hing Lai

      Article first published online: 23 MAY 2006 | DOI: 10.1002/pola.21521

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      Bipyridinophane–fluorene conjugated copolymers have been synthesized via Suzuki and Heck coupling reactions. Poly[2,7-(9,9-dihexylfluorene)-co-alt-5,8-(2,11-dithia[3]paracyclo[3](4,4′)-2,2′-bipyridinophane)] (P7) exhibits large absorption and emission redshifts of 20 and 34 nm, respectively, with respect to its planar reference polymer Poly[2,7-(9,9-dihexylfluorene)-co-alt-1,4-(2,5-dimethylbenzene)] (P11), which bears the same polymer backbone as P7. These spectral shifts originate from intramolecular aromatic C[BOND]H/π interactions, which are evidenced by ultraviolet–visible and 1H NMR spectra as well as X-ray single-crystal structural analysis. However, the effect of the intramolecular aromatic C[BOND]H/π interactions on the spectral shift in poly[9,9-dihexylfluorene-2,7-yleneethynylene-co-alt-5,8-(2,11-dithia[3]paracyclo[3](4,4′)-2,2′-bipyridinophane)] is much weaker.

    21. Core–shell-type multiarm star polyethylenimine-block-poly(ε-caprolactone): Synthesis and guest encapsulation potential (pages 4165–4173)

      Huaji Liu, Zhong Shen, Salah-Eddine Stiriba, Yu Chen, Wenqin Zhang and Liuhe Wei

      Article first published online: 23 MAY 2006 | DOI: 10.1002/pola.21526

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      Novel core–shell-type multiarm star copolymers with poly (ϵ-caprolactone) as the arms and hyperbranched polyethylenimine as the core have been conveniently prepared and efficiently employed as nanocapsules for water-soluble-guest encapsulation.

    22. High-efficiency, electrophosphorescent polymers with porphyrin–platinum complexes in the conjugated backbone: Synthesis and device performance (pages 4174–4186)

      Wenliu Zhuang, Yong Zhang, Qiong Hou, Lei Wang and Yong Cao

      Article first published online: 23 MAY 2006 | DOI: 10.1002/pola.21522

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      A series of soluble, conjugated, electrophosphorescent copolymers with (meso-tetraphenylporphyrinato-κ4N)platinum(II) complexes incorporated into the polymer main chain were synthesized through the copolymerization of porphyrin–platinum(II) complexes and dialkyl-substituted fluorene monomers by a modified Suzuki coupling reaction. The study of the photoluminescence decay indicated that poly[2,7-(9,9-dioctylfluorene)-co-2,12-((meso-tetraphenylporphyrinato-κ4N)platinum(II))] (PFO–PtTPP) was a triplet emitter. The device fabricated with PFO–5PtTPP showed the highest external quantum efficiency of 1.95% with an emission peak at 684 nm in the indium tin oxide/poly(3,4-ethylenedioxythiophene)/polyvinylcarbazole (PVK)/70:30 (w/w) PFO–5PtTPP:2-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole/Ba/Al configuration.

    23. Preparation and characterization of magnetic polymeric composite particles by miniemulsion polymerization (pages 4187–4203)

      Shulai Lu and Jacqueline Forcada

      Article first published online: 23 MAY 2006 | DOI: 10.1002/pola.21525

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      A water-based magnetite ferrofluid was prepared in a first step by the chemical coprecipitation of ferrous and ferric salts with ammonium hydroxide as a precipitating agent and oleic acid as a stabilizer. In a second step, an oil-based styrene magnetite ferrofluid was obtained by the acidification of the water-based magnetite ferrofluid and the dispersion of the acidified magnetite in styrene. Magnetic polymeric composite particles (MPCPs) were prepared by miniemulsion polymerization in the presence of the oil-based styrene magnetite ferrofluid. The results show that miniemulsion polymerization is an effective method for encapsulating magnetite into a hydrophobic polymer successfully. Exposed magnetite particles and pure polymer particles can be avoided completely by the selection of the appropriate preparation conditions. All the resulting MPCPs exhibited superparamagnetism and possessed some magnetic response.

    24. New preparative procedure for photoluminescent metallopolymers having a biphenyl-2,2′-diyl iridium(III) unit bound to a phosphine copolymer ligand (pages 4204–4213)

      Yuji Koga, Keita Ueno and Kouki Matsubara

      Article first published online: 23 MAY 2006 | DOI: 10.1002/pola.21520

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      Polymer-bound photoluminescent iridium complexes bearing a cyclometalated 2,2′-biphenylene ligand were synthesized by the reaction of [Ir(cod)(biph)Cl]2 with the 4-styryldiphenylphosphine copolymer. Photoluminescence of the iridium polymer in the solid state was observed at 597 nm. Luminescent properties depending on the Ir content and molecular weight of the polymers were studied.

  2. Rapid Communications

    1. Top of page
    2. Articles
    3. Rapid Communications
    4. Notes
    1. You have free access to this content
      One-pot synthesis of star-shaped aliphatic polyesters with hyperbranched cores and their characterization with size exclusion chromatography (pages 4214–4221)

      Tadeusz Biela and Ilona Polanczyk

      Article first published online: 23 MAY 2006 | DOI: 10.1002/pola.21514

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      Star-shaped aliphatic polyesters with hyperbranched cores were prepared by a two-step synthesis with the one-pot, arms-first core method. First, the polymerization of ε-caprolactone (CL) or L,L-lactide (LA) was initiated with aluminum isopropoxide trimer. Then, the resulting poly(CL)–OAl< or poly(LA)–OAl< living chains were employed as initiators for 5,5′-bis(oxepan-2-one) or 1,6-dioxaspiro[4,4]nonane-2,7-dione) polymerization. A sequence of chain growth and branching reactions led to the formation of starlike macromolecules. The progress of the polymerization was followed with size exclusion chromatography, and the products of the model reaction were also analyzed with matrix-assisted laser desorption/ionization time-of-flight mass spectrometry.

    2. You have free access to this content
      Cobalt(I)-mediated living radical polymerization of methyl methacrylate (pages 4222–4228)

      Kouki Matsubara and Megumi Matsumoto

      Article first published online: 23 MAY 2006 | DOI: 10.1002/pola.21498

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      The living/controlled radical polymerization of methyl methacrylate initiated by CCl3X (X = Cl or Br) in the presence of Co(PPh3)3I, which was the first cobalt(I) complex used for atom transfer radical polymerization as a catalyst, was achieved. Iodine binding to a cobalt atom was found to be essential as a labile ligand.

    3. You have free access to this content
      Synthesis of rectangular tubes of polyaniline/NiO composites (pages 4229–4234)

      Jie Han, Genping Song and Rong Guo

      Article first published online: 23 MAY 2006 | DOI: 10.1002/pola.21512

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      Polyaniline nanorods and nanotubes can be synthesized in the presence of sodium dodecylbenzenesulfonate as a micellar template and dopant, whereas polyaniline/NiO composite rectangular tubes can be obtained through a self-assembly process with the addition of NiO nanoparticles. With an increasing number of NiO nanoparticles, the size of polyaniline/NiO composite rectangular tubes changes from a nanometer to a micrometer, and the conductivity and thermal stability also increase. The coordination bond between NiO and polyaniline is the key factor in the formation of the right angle of polyaniline/NiO composite rectangular tubes.

  3. Notes

    1. Top of page
    2. Articles
    3. Rapid Communications
    4. Notes
    1. You have free access to this content
      Ring-opening polymerization of trimethylene carbonate by poly(ethylene glycol) in the presence of HCl·Et2O as a monomer activator (pages 4235–4241)

      Hoon Hyun, Moon Suk Kim, Gilson Khang and Hai Bang Lee

      Article first published online: 23 MAY 2006 | DOI: 10.1002/pola.21504

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      Poly(ethylene glycol) and poly(trimethylene carbonate) block copolymers were prepared successfully at room temperature by the living ring-opening polymerization of trimethylene carbonate with poly(ethylene glycol) as an initiator in the presence of HCl·Et2O as a monomer activator.

    2. You have free access to this content
      Synthesis and assembly behavior of nucleobase-functionalized block copolymers (pages 4242–4250)

      Henri J. Spijker, A. J. Dirks and Jan C. M. van Hest

      Article first published online: 23 MAY 2006 | DOI: 10.1002/pola.21529

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      Block copolymers consisting of a poly(ethylene glycol) chain and a thymine- or adenine-functional polymethacrylate block have been prepared with atom transfer radical polymerization, and their aggregation behavior in an aqueous medium has been studied. Upon the mixing of the two block copolymers, the critical aggregation concentration increases in comparison with the critical aggregation concentration of the individual block copolymers. It has therefore been demonstrated that the amphiphilic behavior of this class of block copolymers is affected by the interaction between the complementary nucleobases, which leads to an unexpected increase in the hydrophilicity of the block copolymer ensemble.

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