Journal of Polymer Science Part A: Polymer Chemistry

Cover image for Vol. 53 Issue 2

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. New acid/base salts as co-catalysts for the organocatalyzed ring opening polymerization of lactide

    Yong Miao, Nicholas Stanley, Audrey Favrelle, Till Bousquet, Marc Bria, André Mortreux and Philippe Zinck

    Article first published online: 17 DEC 2014 | DOI: 10.1002/pola.27488

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    DBU/BNPH and DMAP/CSA conjugates are used in combination with a base such as DBU or DMAP for the ring-opening polymerization of lactide. The polymerization is well controlled for all combinations in mild conditions (DM < 1.1), and the influence of acid/base equilibria involving two different bases on the catalysis is discussed. The presence of the salts leads, depending on the combination, to narrower molecular weight distributions, higher activities and higher initiation efficiency, and prevents transesterification.

  2. Ionic conductivity probed in main chain liquid crystalline azobenzene polyesters

    Chinmay G. Nardele, Vishal M. Dhavale, K. Sreekumar and S. K. Asha

    Article first published online: 16 DEC 2014 | DOI: 10.1002/pola.27484

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    Thermal and optical modulation of ionic conductivity was demonstrated in the main chain azo liquid crystalline polyesters. Maximum ionic conductivity was observed in the range of 10−5 S cm−1 at room temperature (25 °C), which increased to 10−4 S cm−1 above 65 °C.

  3. Fluorene based donor-acceptor polymer electrets for nonvolatile organic transistor memory device applications

    Lei Dong, Han-Sheng Sun, Jau-Tzeng Wang, Wen-Ya Lee and Wen-Chang Chen

    Article first published online: 16 DEC 2014 | DOI: 10.1002/pola.27483

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    The relationship between memory behavior and acceptor structures are investigated, providing new insight for molecular design of nonvolatile memories. Four fluorine-based donor-acceptor polyimides act as charge storage layers for transistor-type memory devices. The various memory characteristics including EORM, semi-flash, and flash types can be tuned by changing acceptor moieties. Among these polymer electrets, PI(BAPF-6FDA) has largest memory window (77 V) and excellent operation stability (more than 100 cycles).

  4. Core-shell structured poly(glycidyl methacrylate)/BaTiO3 nanocomposites prepared by surface-initiated atom transfer radical polymerization: A novel material for high energy density dielectric storage

    Muhammad Ejaz, Venkata S. Puli, Ravinder Elupula, Shiva Adireddy, Brian C. Riggs, Douglas B. Chrisey and Scott M. Grayson

    Article first published online: 16 DEC 2014 | DOI: 10.1002/pola.27485

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    The surface-initiated atom transfer radical polymerization has been applied to graft polyglycidyl methacrylates (PGMA) on the surface of BaTiO3 nanoparticles in two steps to form core-shell structured BaTiO3-PGMA nanocomposites. BaTiO3 are covered with a dense uniform film of grafted PGMA. The resultant BaTiO3-PGMA nanocomposites show an improved dielectric constant, a high breakdown field strength and high-energy storage density. Improved dielectric and electrical properties of these nanocomposites are attributed to good nanoparticles dispersion and enhanced interfacial polarization.

  5. Hybrid acrylate-oxetane photopolymerizable systems

    James V. Crivello

    Article first published online: 16 DEC 2014 | DOI: 10.1002/pola.27480

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    Hybrid interpenetrating network polymers were prepared by the concurrent free radical and cationic photopolymerizations of mixtures of multifunctional acrylate and oxetane monomers. The use of highly reactive “kick-started” oxetanes in these systems provides network films that are homogeneous, hard, colorless, and transparent.