Journal of Polymer Science Part A: Polymer Chemistry

Cover image for Vol. 53 Issue 17

Impact Factor: 3.113

ISI Journal Citation Reports © Ranking: 2014: 18/82 (Polymer Science)

Online ISSN: 1099-0518

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

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  1. Dendritic hydrogels: From exploring various crosslinking chemistries to introducing functions and naturally abundant resources

    Surinthra Mongkhontreerat, Oliver C. J. Andrén, Assya Boujemaoui and Michael Malkoch

    Article first published online: 31 JUL 2015 | DOI: 10.1002/pola.27750

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    Dendritic hydrogels from dendritic-linear-dendritic (DLD) block copolymers based on PEG and bis-MPA dendrons were constructed via UV-initiated thiol-ene, thiol-yne, CuAAC, and amine-NHS crosslinking chemistries. Stoichiometric ratio manipulations, prior to film formation, resulted in functional hydrogels with tuneable compressive moduli. The highest gel fractions for all networks were obtained at off-stoichiometric ratios with surplus of DLDs. Finally, sustainable networks were fabricated by amalgamating DLD, naturally abundant cellulose nanocrystal, and protein-based bovine serum albumin.

  2. A facile synthesis of catechol-functionalized poly(ethylene oxide) block and random copolymers

    Kaila M. Mattson, Allegra A. Latimer, Alaina J. McGrath, Nathaniel A. Lynd, Pontus Lundberg, Zachary M. Hudson and Craig J. Hawker

    Article first published online: 31 JUL 2015 | DOI: 10.1002/pola.27749

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    A modular strategy, starting from readily available methyl eugenol, to imbed protected catecholic moieties at controlled levels within polyethers is presented. This simple, high-yielding synthesis represents the first time catechols have been controllably dispersed throughout polyethylene oxide (PEO)-based polymer backbones. The precise tunability afforded by this system can enable systematic investigation of the effects that variables such as molecular weight, catechol incorporation, and catechol location can have on surface-anchored PEO.

  3. Photochemical stability of dicyano-substituted poly(phenylenevinylenes) with different side chains

    Logan P. Sanow, Jianyuan Sun and Cheng Zhang

    Article first published online: 31 JUL 2015 | DOI: 10.1002/pola.27755

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    The photodegradation mechanism study has been conducted on poly(2,5-dioctyl-1,4-phenylene-1,2-dicyanovinylene) (C8-diCN-PPV) and poly[2,5-bis(decyloxy)−1,4-phenylene-1,2-dicyanovinylene] (RO-diCN-PPV) to understand the reason behind the faster photodegradation of C8-diCN-PPV which has a lower LUMO. In both polymers, radical superoxide anion mechanism, which is responsible for electron-rich RO-PPVs, is found to be energetically unfavorable due to diCN substitution. Combined IR, UV–vis, photoluminescence, and phosphorescence spectroscopies study indicates that singlet oxygen is the main culprit for photodegradation of both polymers.

  4. A visible light responsive azobenzene-functionalized polymer: Synthesis, self-assembly, and photoresponsive properties

    Guojie Wang, Dong Yuan, Tingting Yuan, Jie Dong, Ning Feng and Guoxiang Han

    Article first published online: 29 JUL 2015 | DOI: 10.1002/pola.27747

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    An amphiphilic tetra-o-methoxy-substituted-azobenzene-functionalized poly(acrylic acid) was synthesized via the postpolymerization modification method, which can exhibit the trans-to-cis photoswitching under green light irradiation at 520 nm and the cis-to-trans photoswitching under blue light irradiation at 420 nm in both solution and aggregate state. The fluorescence of loaded Nile Red in the self-assembled polymer nanoparticles can be tuned upon the visible light irradiation.

  5. Graft modification of crystalline nanocellulose by Cu(0)-mediated SET living radical polymerization

    Hai-Dong Wang, Ryan D. Roeder, Ralph A. Whitney, Pascale Champagne and Michael F. Cunningham

    Article first published online: 28 JUL 2015 | DOI: 10.1002/pola.27754

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    Cu(0)-catalyzed SET living radical polymerization was used to graft poly(methyl acrylate) from a crystalline nanocellulose (CNC) surface. The polymer grafting step process exhibits fast polymerization kinetics and a very low level of copper consumption. The resulting polymerization medium is clear with almost no color, indicating low dissolved copper concentrations.

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