Journal of Polymer Science Part A: Polymer Chemistry

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Impact Factor: 3.543

ISI Journal Citation Reports © Ranking: 2012: 12/83 (Polymer Science)

Online ISSN: 1099-0518

Associated Title(s): Journal of Polymer Science Part B: Polymer Physics

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  1. Tailoring heterogeneous polymer networks through polymerization-induced phase separation: influence of composition and processing conditions on reaction kinetics and optical properties

    Carmem S. Pfeifer, Zachary R. Shelton, Caroline R. Szczpanski, Matthew D. Barros, Nicholas D. Wilson and Jeffrey W. Stansbury

    Article first published online: 17 APR 2014 | DOI: 10.1002/pola.27185

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    The crossover between loss and storage modulus during polymerization is assumed to be a good approximation of the onset of gelation. The abrupt decrease in the intensity of light transmitted through a mixture of marginally compatible monomers during polymerization is used to determine the onset of phase-separation. Because both these parameters (modulus development and optical transmission) were indexed to the degree of conversion in real-time, it is possible to demonstrate that heterogeneity formation precedes gelation in an all-methacrylate system, photopolymerized with a single radical initiator.

  2. One-step synthesis of polymer micro-tubes tethered by polymer nanowire networks via RAFT polymerization of N,N′-methylene bisacrylamide xerogel fibers in toluene and ethanol mixed solution

    Qi Li and Liming Tang

    Article first published online: 17 APR 2014 | DOI: 10.1002/pola.27194

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    The new preparation method of polymer micro-tubes tethered by polymer nanowire networks (PTPWNs) is presented. PTPWNs are fabricated facilely via one-step reversible addition fragmentation chain transfer (RAFT) polymerization of N,N′-methylene bisacrylamide (MBA) xerogel fibers as both template and monomer source in toluene and ethanol mixed solution. The amount of polymer nanowire networks on the tubes can be controlled by varying the ethanol content in solution.

  3. Selective nucleophilic additions to poly(methacrylate)s containing isothiocyanate moieties in the side chains and their application in cross-linking

    Ryota Seto, Kozo Matsumoto and Takeshi Endo

    Article first published online: 15 APR 2014 | DOI: 10.1002/pola.27189

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    Reactivity of isothicyanate moiety containing polymethacrylate in the side chain with amine, alcohol, or thiol was investigated. The isothiocyanate moiety containing polymethacrylates in the side chain reacted with amines without a catalyst. Conversely, the isothiocyanates did not react with alcohol or thiols under the same condition applied to the amines. Addition of alcohol or thiol to the isothiocyanate needs catalysts. A diamine or diol was added to the isothicyanates to prepare networked polymers.

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    Synthesis and solid-state self-assembly of poly(ethylene glycol)-b-poly(γ-benzyl-l-glutamate)s and single-walled carbon nanotubes

    Haoyu Tang, Ying Ling, Yong Deng and Donghui Zhang

    Article first published online: 14 APR 2014 | DOI: 10.1002/pola.27193

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    A series of coil-rod poly(ethylene glycol)-b-poly(γ-benzyl-l-glutamate)s (PEG-b-PBLGs) with α-helical conformations have been prepared from methoxypoly(ethylene glycol) amine (mPEG-NH2)-mediated ring-opening polymerization of γ-benzyl-l-glutamic acid based N-carboxylanhydride. PEG-b-PBLGs form a lamellar structure where PBLG segments pack into hexagonal arrays when frod is less than 0.28. Incorporation of single-walled carbon nanotube (SWCNT) causes an increase of the d-spacing of both lamellar and hexagonal packing, suggesting the intercalation of SWCNTs into the PEG-b-PBLGs matrices the SWCNTs are oriented normal to the lamellar interface.

  5. Synthesis and properties of long-chain branched poly(ether sulfone)s by self-polycondensation of AB2 type macromonomers

    Mitsutoshi Jikei, Daisuke Uchida, Kazuya Matsumoto, Ryohei Komuro and Masataka Sugimoto

    Article first published online: 14 APR 2014 | DOI: 10.1002/pola.27188

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    Long-chain branched poly(ether sulfone)s (PESs) are synthesized via self-polycondensation of AB2 macromonomers. Gel permeation chromatography with multiangle light scattering detection and solution viscosity measurements suggest that the molecular shape of long-chain branched PESs changes from hyperbranched to a linear-like architecture, depending on the molecular weight of the AB2 macromonomers. Rheological measurements suggest the presence of strongly entangled chains in the long-chain branched PES synthesized from the high-molecular-weight macromonomer.

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