Journal of Polymer Science Part A: Polymer Chemistry

Cover image for Vol. 52 Issue 22

Impact Factor: 3.245

ISI Journal Citation Reports © Ranking: 2013: 14/82 (Polymer Science)

Online ISSN: 1099-0518

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

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  1. Dynamic covalent polypeptides showing tunable secondary structures and thermoresponsiveness

    Jiatao Yan, Kun Liu, Xiuqiang Zhang, Wen Li and Afang Zhang

    Article first published online: 19 OCT 2014 | DOI: 10.1002/pola.27433

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    The imine condensation from poly(l-lysine)s and oligoethylene glycol (OEG)-based dendritic aldehydes afforded dynamic OEGylated polypeptides, which show enhanced helical conformation and superior thermoresponsive properties. Their phase transition temperatures were governed predominately by terminal groups and coverage of OEG dendrons, and could be tuned simply by varying ratios of OEG dendrons with different hydrophilicity. Furthermore, thermally induced dehydration and aggregation was found to enhance the imine formation and, at the same time, to switch helical conformations of polypeptides.

  2. Synthesis via ATRP, kinetics study and characterization (molecular-morphological) of 3-Arm star diblock copolymers of the (PS-b-P2VP)3 type

    George Polymeropoulos, Dimitrios Moschovas, Anastasia Kati, Apostolos Karanastasis, Styliani Pelekanou, Panagiotis Christakopoulos, Georgios Sakellariou and Apostolos Avgeropoulos

    Article first published online: 18 OCT 2014 | DOI: 10.1002/pola.27432

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    The successful synthesis via ATRP of 3-arm star homopolymers and corresponding diblock copolymers of the (PS)3 and (PS-b-P2VP)3 types, through an initiator bearing three –Br groups, is discussed. A kinetics study is performed for the synthesis of the star homopolymer to evaluate polymerization time versus polydispersity, molecular weight, and yield. Molecular characterization through various techniques verifies the preparation of both architectures and TEM studies confirm the microphase separation of the final copolymers.

  3. RAFT polymerization kinetics and polymer characterization of P3HT rod–coil block copolymers

    Melissa R. Kern and Stephen G. Boyes

    Article first published online: 18 OCT 2014 | DOI: 10.1002/pola.27425

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    The reversible addition–fragmentation chain transfer (RAFT) polymerization kinetics using a poly(3-hexylthiophene) (P3HT) macroRAFT agent, in which the P3HT is incorporated into the R group of the RAFT agent, are reported.

  4. Thieno[3,2-b]thiophene-substituted benzodithiophene in donor–acceptor type semiconducting copolymers: A feasible approach to improve performances of organic photovoltaic cells

    Ji-Hoon Kim, Hee Su Kim, Jong Baek Park, In-Nam Kang and Do-Hoon Hwang

    Article first published online: 18 OCT 2014 | DOI: 10.1002/pola.27431

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    New D-A type copolymer (PTTBDT-TPD) consisting of TTBDT and thieno[3,4-c]pyrrole-4,6-dione (TPD) is synthesized by Stille-coupling polymerization. A PTTBDT-TPD analog consisting of TTBDT and alkylthienyl-substituted BDT (PTBDT-TPD) is also synthesized to compare the optical, electrochemical, morphological, and photovoltaic properties of the polymers.

  5. Synthesis of Pyridine Chitosan and its Protonic Conductivity

    Yingxin Deng, Brett A. Helms and Marco Rolandi

    Article first published online: 18 OCT 2014 | DOI: 10.1002/pola.27430

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    The synthesis of a positively charged and water soluble chitosan derivative from chitosan is presented.