Journal of Polymer Science Part A: Polymer Chemistry

Cover image for Vol. 49 Issue 9

1 May 2011

Volume 49, Issue 9

Pages 1933–2105

  1. Articles

    1. Top of page
    2. Articles
    3. Article
    4. Articles
    1. Synthesis and characterization of soluble low-bandgap oligothiophene-[all]-S,S-dioxides-based conjugated oligomers and polymers (pages 1933–1941)

      Elizabeth Amir, Kulandaivelu Sivanandan, Justin E. Cochran, John J. Cowart, Sung-Yu Ku, Jung Hwa Seo, Michael L. Chabinyc and Craig J. Hawker

      Version of Record online: 15 MAR 2011 | DOI: 10.1002/pola.24641

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      The synthesis and characterization of a new family of soluble oligothiophene-S,S-dioxides and their use as building blocks to form polythiophene-S,S-dioxides leads to the narrowing of the polymer bandgap and greater electron-accepting ability.

    2. Thermoresponsive star triblock copolymers by combination of ROP and ATRP: From micelles to hydrogels (pages 1942–1952)

      Weipu Zhu, Alper Nese and Krzysztof Matyjaszewski

      Version of Record online: 1 MAR 2011 | DOI: 10.1002/pola.24611

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      Well-defined four-arm star triblock copolymers (PCL-b-POEOMA475-b-PMEO2MA)4 and (PCL-b-PMEO2MA-b-POEOMA475)4 were successfully synthesized by the combination of ring-opening polymerization and atom transfer radical polymerization ROP and ATRP. The thermal responses of the two series of copolymers are quite different and depend on the sequence distribution of each block along the arms of the star. The (PCL-b-POEOMA475-b-PMEO2MA)4 star triblock copolymer, with the thermoresponsive PMEO2MA segment on the periphery, can undergo reversible sol-gel transitions between room temperature (22 °C) and human body temperature (37 °C).

    3. Sugar-based hydrophilic polyurethanes and polyureas (pages 1953–1961)

      Belén Begines, Francisca Zamora, Isaac Roffé, Manuel Mancera and Juan A. Galbis

      Version of Record online: 1 MAR 2011 | DOI: 10.1002/pola.24621

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      Linear polyurethanes and polyureas with enhanced hydrophilic character have been successfully prepared from xylitol, 1,6-diamino-1,6-dideoxy-3:4-O-isopropylidene-D-mannitol, and 1,6-diamino-1,6-dideoxy-D-mannitol. All these polymers are stable up to temperatures above 210 °C, with maximum decomposition rates at temperatures above 230 °C. Some of them are semicrystalline materials showing melting endotherms with high melting enthalpies. The polyurethanes are hydrolytically degradable under physiological conditions.

    4. Linear tetrablock quaterpolymers via triple click reactions, azide-alkyne, diels–alder, and nitroxide radical coupling in a one-pot fashion (pages 1962–1968)

      Hakan Durmaz, Gurkan Hizal and Umit Tunca

      Version of Record online: 1 MAR 2011 | DOI: 10.1002/pola.24622

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      The various living polymerization generated linear polymers with orthogonal end-functionalities, maleimide-terminated poly(ethylene glycol) (PEG-MI), anthracene and azide-terminated polystyrene, alkyne- and bromide-terminated poly(tert-butyl acrylate) or alkyne-poly(n-butyl acrylate) (PnBA)-Br, and tetramethylpiperidine-1-oxyl (TEMPO)-terminated poly(ε-caprolactone) (PCL-TEMPO) were clicked together in a one-pot fashion to generate PEG-b-PS-b-PtBA-b-PCL or PEG-b-PS-b-PnBA-b-PCL quaterpolymer using Cu(0), CuBr, and PMDETA as catalyst in DMF at 80 °C for 36 h.

    5. Magnetic-targeted pH-responsive drug delivery system via layer-by-layer self-assembly of polyelectrolytes onto drug-containing emulsion droplets and its controlled release (pages 1969–1976)

      Bin Mu, Peng Liu, Pengcheng Du, Yun Dong and Chunyin Lu

      Version of Record online: 4 MAR 2011 | DOI: 10.1002/pola.24623

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      The oil-in-water type hybrid emulsion droplets containing the superparamagnetic ferroferric oxide nanoparticles and drug molecules were encapsulated as cores by the layer-by-layer self-assembly of oligochitosan as the polycation and sodium alginate as the polyanion via the electrostatic interaction. The novel magnetic-targeted pH-responsivedrug delivery system (DIP/Fe3O4-OA/OA)@(OCS/SAL)4 showed high encapsulation efficiency of drugs and drug-loading capacity and exhibited excellent pH-dependant controlled release performance.

    6. New series of AB2-type hyperbranched polytriazoles derived from the same polymeric intermediate: Different endcapping spacers with adjustable bulk and convenient syntheses via click chemistry under copper(I) catalysis (pages 1977–1987)

      Zhong'An Li, Wenbo Wu, Guofu Qiu, Gui Yu, Yunqi Liu, Cheng Ye, Jingui Qin and Zhen Li

      Version of Record online: 15 MAR 2011 | DOI: 10.1002/pola.24625

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      Six new AB2-type polytriazoles containing azo-chromophore moieties, derived from the same hyperbranched polymer intermediate, were successfully prepared through click reaction under copper(I) catalysis by modifying the synthetic route, in which different isolation groups in different size were introduced to the periphery of the hyperbranched polymers as end-capping moieties.

    7. Synthesis and photochemical properties of novel pentamethylated norbornadiene containing polyimides (pages 1988–1998)

      Ahmed Oueslati, Hatem Ben Romdhane, Vincent Martin, Fréderic Schiets, Régis Mercier and Refaât Chaâbouni

      Version of Record online: 7 MAR 2011 | DOI: 10.1002/pola.24626

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      The synthesis and the characterization of new polyimides containing pentamethylated norbornadiene (NBD) moieties in the main chain from a new synthesized dianhydride monomer and various aromatic diamines are described. The photochemical isomerization of the NBD into quadricyclane (QC) was investigated by UV/vis spectrophotometry from polymer films using visible sunlight as irradiation source. The stored energies released by the transformation of QC groups into NBD ones of the irradiated polymer films were also evaluated by DSC measurement. The photochemical behavior of these novel polyimides under visible sunlight irradiation shows that they have both photoreactivity and capacity for heat storage.

    8. Poly(ascorbyl acrylate)s: Synthesis and evaluation of their redox polymerization ability in the presence of hydrogen peroxide (pages 1999–2007)

      Dequan Zhuang, Jun Nie and Jing Yang

      Version of Record online: 4 MAR 2011 | DOI: 10.1002/pola.24627

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      The synthesis of ascorbic acid functionalized polyacrylate (PAAA) was performed by a combination of RAFT polymerization and debenzylation technique. The initiation polymerization ability of redox pair composed of PAAA and H2O2 was studied via realtime FT-NIR to present high initiation efficiency and adjustable polymerization effect.

    9. Anionic polymerization of MMA and renewable methylene butyrolactones by resorbable potassium salts (pages 2008–2017)

      Yangjian Hu, Laura O. Gustafson, Hongping Zhu and Eugene Y.-X. Chen

      Version of Record online: 7 MAR 2011 | DOI: 10.1002/pola.24628

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      Three resorbable potassium salts of hydride K[H], enolate K[E], and allyl K[A], as well as their “ate” complexes with bulky and strong aluminum Lewis acids have been used for controlled anionic polymerization of MMA and renewable (M)MBL monomers at ambient temperature.

    10. Radical polymerization of 1-alkenes catalyzed by lithium salts of carboranes (pages 2018–2023)

      Miroslav Janata, Petr Vlček, Petra Látalová, Romana Svitáková, Jiří Kaleta, Michal Valášek, Victoria Volkis and Josef Michl

      Version of Record online: 9 MAR 2011 | DOI: 10.1002/pola.24629

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      Radical polymerization of selected 1-alkenes, 1-hexene, 1-octene and 2-methyl-1-heptene, initiated with thermal decomposition of classical radical initiators and catalyzed by lithium salts of selected carboranes, was investigated. Despite the relatively high monomer conversions (depending on the type of initiator), only low-molecular-weight oligomers with Mn < 1000 are formed regardless of the initiator and carborane used. Thus, our results suggest that the recently reported1 radical polymerization of 1-alkenes, which have so far been known as nonpolymerizable by the radical mechanism, is much harder to reproduce for alkenes with longer chains than it is for isobutylene4 and propylene.5

    11. Tunable poly(hydroxyl urethane) from CO2-Based intermediates using thiol-ene chemistry (pages 2024–2032)

      Chau N. Tang, Hunaid B. Nulwala, Krishnan Damodaran, Palwinder Kaur and David R. Luebke

      Version of Record online: 9 MAR 2011 | DOI: 10.1002/pola.24631

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      CO2-based, crosslinked poly(hydroxyl urethane)s (PHUs) are accessed via a set of efficient reactions based on the addition chemistry of thiol-ene and amines-cyclic carbonates. The thiol-ene reaction was utilized to access multi-functional cyclic carbonates in quantitative yield from 4-vinyl-1,3-dioxolan-2-one and thiols. These precursors were simply mixed with diethylenetriamine and/or 1,6-diaminohexane to generate crosslinked PHUs.

    12. Synthesis and micellization of new biodegradable phosphorylcholine-capped polyurethane (pages 2033–2042)

      Zhigao Wang, Pengjun Wan, Mingming Ding, Xuan Yi, Jiehua Li, Qiang Fu and Hong Tan

      Version of Record online: 9 MAR 2011 | DOI: 10.1002/pola.24632

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      Schematic illustration of the structure and micelle formation of the polyurethane without phosphorylcholine and phosphorylcholine-capped polyurethane. New biocompatible multiblock biodegradable phosphorylcholine-capped polyurethane micelles were developed by a facile approach, which had adjustable bulk and micelle degradation rate, micellar size, size distribution, and zeta potential. These micelles would be well tailored for drug delivery and bioimaging applications.

  2. Article

    1. Top of page
    2. Articles
    3. Article
    4. Articles
    1. Growing poly(N-vinylcarbazole) from the surface of graphene oxide via RAFT polymerization (pages 2043–2050)

      Bin Zhang, Yu Chen, Liqun Xu, Longjia Zeng, Ying He, En-Tang Kang and Jinjuan Zhang

      Version of Record online: 9 MAR 2011 | DOI: 10.1002/pola.24633

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      A new “grafting from” method to grow poly(N-vinylcarbazole) from the surface of graphene oxide via RAFT polymerization is described. This material was successfully used to fabricate a nonvolatile memory device, which exhibited a typical bistable electrical switching and rewritable memory effect.

  3. Articles

    1. Top of page
    2. Articles
    3. Article
    4. Articles
    1. Fluorinated vinyl ether homopolymers and copolymers: Living cationic polymerization and temperature-induced solubility transitions in various organic solvents including perfluoro solvents (pages 2051–2058)

      Hiroaki Shimomoto, Dai Fukami, Shokyoku Kanaoka and Sadahito Aoshima

      Version of Record online: 9 MAR 2011 | DOI: 10.1002/pola.24634

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      Partially fluorinated poly(vinyl ether)s having C4F9 and C6F12H groups were synthesized via base-assisting living cationic polymerization in a fluorine-containing solvent, dichloropentafluoropropanes. The product polymers have narrow molecular weight distributions (Mw/Mn ∼1.1), which were characterized using size exclusion chromatography with a fluorinated solvent as an eluent. Interestingly, the moderately fluorinated polymers exhibited temperature-induced solubility transitions in various organic solvents with wide-ranging polarities. In addition, various types of fluorinated diblock and triblock copolymers were prepared in a living manner. The block copolymers with a thermosensitive fluorinated segment underwent temperature-induced micellization and sol–gel transition.

    2. Thermal and spectral stability of fluorescent copolymers containing tetraphenylthiophene-quinoline unit (pages 2059–2069)

      Chung-Tin Lai, Rong-Hong Chien, Chi-Wei Liu and Jin-Long Hong

      Version of Record online: 9 MAR 2011 | DOI: 10.1002/pola.24635

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      Photos clearly showed that the bright blue-green light emitted from devices with the PTPQu- and PTPTPQu-emitting layers remained essentially unaltered despite the whole assemblies had been annealed at the respective high temperatures of 250 and 300 °C for 4 h. Therefore, it is safe to conclude that the EL spectra of the PLEDs based on the PTPQu and PTPTPQu copolymers are highly stable.

    3. Understanding and preventing the formation of deformed polymer particles during synthesis by a seeded polymerization method (pages 2070–2080)

      Anong Srisopa, A. M. Imroz Ali and Andrew G. Mayes

      Version of Record online: 15 MAR 2011 | DOI: 10.1002/pola.24636

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      The size and molecular weight of polystyrene (PS) seed particles are important in defining the morphology of polymer particles prepared by seeded swelling methods. Deformed particles, including collapsed “red blood cell-like” and dimpled structures, were obtained when high-molecular weight PS was used as seed template. Confocal microscopy combined with fluorescently labeled PS seeds confirmed that particle collapse is driven by phase separation of the PS during polymerization. Using 1,1-diphenylethylene (DPE) during seed synthesis, small seeds with low-molecular weight PS could be generated. These new DPE seeds yielded spherical particles from a variety of monomers after swelling and polymerization.

    4. Ring-opening polymerization of ε-caprolactone catalyzed by Yttrium trisphenolate in the presence of 1,2-propanediol. Do both primary and secondary hydroxyl groups initiate polymerization? (pages 2081–2089)

      Jun Ling, Jinzhi Liu, Zhiquan Shen and Thieo E. Hogen-Esch

      Version of Record online: 7 MAR 2011 | DOI: 10.1002/pola.24637

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      In the presence of yttrium trisphenolate, both the primary and secondary hydroxyl groups of 1,2-propanediol initiate ring-opening polymerization of ε-caprolactone. The molecular weights of polymers are controlled by the CL/PD molar ratios and the MW distributions are narrow. Computational studies support these facile reactions that the chain transfers between the active yttrium alkoxides and the residual hydroxyl groups are much faster than chain propagations.

    5. Formation of higher cyclic oligomers in polyamide-4,6 (pages 2090–2096)

      R. Rulkens and R. Peters

      Version of Record online: 15 MAR 2011 | DOI: 10.1002/pola.24638

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      Morphology steered PA46-based cyclic oligoamide profiles of PA46, reacting back toward the normal Jacobsen and Stockmayer distribution at 310 °C in the melt. The figure shows the disappearing peak of higher cyclic oligomers and demonstrates the lamellae-supported mechanism for the morphology-promoted cyclic condensation reactions to the cyclic decamide and dodecamide.

    6. Versatile functionalization of polyester hydrogels with electroactive aniline oligomers (pages 2097–2105)

      Baolin Guo, Anna Finne-Wistrand and Ann-Christine Albertsson

      Version of Record online: 15 MAR 2011 | DOI: 10.1002/pola.24643

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      A series of electrically conductive and degradable hydrogels, which exhibit similar conductivities but with much lower aniline oligomer content compared with that in our previous work and will avoid the acidic degradation product from polylactide, have been synthesized based on polycaprolactone and carboxyl-capped aniline pentamer (CCAP). These hydrogels have been prepared by facile coupling reactions between CCAP and HEMA from a degradable network of photocrosslinked GMA-PCEC macromer. The conductivity and swelling ratio of these hydrogels were tuned by changing the CCAP content, the crosslinking degree, and the molecular weight of PEG, which can meet the requirement of a specific application.

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