Journal of Polymer Science Part A: Polymer Chemistry

Cover image for Vol. 52 Issue 13

1 July 2014

Volume 52, Issue 13

Pages i–iv, 1771–1915

  1. Cover Image

    1. Top of page
    2. Cover Image
    3. Articles
    4. Note
    1. You have free access to this content
      Cover Image, Volume 52, Issue 13 (pages i–ii)

      Article first published online: 24 MAY 2014 | DOI: 10.1002/pola.27237

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      Conjugated polymers containing the triphenylamine group have been synthesized and used to prepare conjugated polymer nanoparticles (CPNs). Described on page 1898 (DOI: 10.1002/pola.27215), Jaeguk Noh, Byung-Jae Chae, Bon-Cheol Ku, and Taek Seung Lee show that conjugated polymer nanoparticles modified with polyarginine exhibit excellent interactions with graphene oxide (GO). This interaction induces the quenching of conjugated polymer nanoparticle fluorescence upon formation of the CPN-GO nanohybrid. Upon exposure to trypsin, the quenched fluorescence is recovered by release of the CPN from the CPN-GO nanohybrid; trypsin cleaves the polyarginine linkage, resulting in weakening of interaction between the CPN and GO.

    2. You have free access to this content
      Cover Image, Volume 52, Issue 13 (pages iii–iv)

      Article first published online: 24 MAY 2014 | DOI: 10.1002/pola.27238

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      On page 1905 (DOI: 10.1002/pola.27193), Haoyu Tang, Ying Ling, Yong Deng, and Donghui Zhang describe the preparation of a series of coil-rod poly(ethylene glycol)-b-poly(γ-benzyl-L-glutamate)s (PEG-b-PBLGs). FTIR analysis shows they adopt an α-helix in the solid state. S/WAXS analysis reveals a lamellar structure of the PEG-b-PBLGs where PBLG segments pack into hexagonal arrays when frod is less than 0.28. Incorporation of single-walled carbon nanotubes (SWCNTs) causes a d-spacing increase in both lamellar and hexagonal packing. This suggests that in the intercalation of SWCNTs into the PEG-b-PBLGs matrices, the SWCNTs are oriented normal to the lamellar interface.

  2. Articles

    1. Top of page
    2. Cover Image
    3. Articles
    4. Note
    1. Synthesis and characterization of biodegradable pH and reduction dual-sensitive polymeric micelles for doxorubicin delivery (pages 1771–1780)

      Yanfeng Chu, Huan Yu, Yingying Ma, Yunti Zhang, Weihai Chen, Guangyan Zhang, Hua Wei, Xianzheng Zhang, Renxi Zhuo and Xulin Jiang

      Article first published online: 14 APR 2014 | DOI: 10.1002/pola.27192

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      Facile preparation of doxorubicin-loaded polymeric micelles based on new pH- and reduction-sensitive degradable amphiphilic polymers by an easy and quick pH-jumping method without using an organic solvent is reported. The obtained drug-loaded micelles show retarded drug release in phosphate buffered saline at pH 7.4 and a rapid release after exposure to weakly acidic or reductive environments, mimicking intracellular conditions, displaying obvious anticancer activity similar to free doxorubicin. In contrast, the blank micelles were nontoxic.

    2. Spotlight Article

      Click functionalization of methacrylate-based hydrogels and their cellular response (pages 1781–1789)

      Miriem Santander-Borrego, David W. Green, Traian V. Chirila, Andrew K. Whittaker and Idriss Blakey

      Article first published online: 11 APR 2014 | DOI: 10.1002/pola.27183

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      Synthetic hydrogels have many applications as biomaterials, where the nature and degree of functionality has a significant effect on performance. Here, a facile method for preparing functional hydrogels is presented, such that it is possible to control the density of functionality as well as the cellular response.

    3. Synthesis and polymerization of styrene monomers bearing spiroorthoester structure and volume change during crosslinking by double ring-opening of the pendant spiroorthoesters of the obtained polymers (pages 1790–1795)

      Takahiro Miyata, Kozo Matsumoto, Shigeaki Yonemori and Takeshi Endo

      Article first published online: 11 APR 2014 | DOI: 10.1002/pola.27184

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      Styrene-based monomers having spiroorthoester structure (SOE5, SOE7) were prepared, and their homopolymerizations and copolymerizations with styrene were examined. Volume changes of the polymers during crosslinking were also investigated. These polymers and copolymers showed little volume shrinkage or slight volume expansion during the crosslinking.

    4. Tailoring heterogeneous polymer networks through polymerization-induced phase separation: influence of composition and processing conditions on reaction kinetics and optical properties (pages 1796–1806)

      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.

    5. Tuning the low critical solution temperature of polymer brushes grafted on single-walled carbon nanotubes and temperature dependent loading and release properties (pages 1807–1814)

      Xin Jia, Guoxiang Zhang, Wei Li, Wenbo Sheng and Cuihua Li

      Article first published online: 14 APR 2014 | DOI: 10.1002/pola.27186

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      An easy and reliable method is developed to tune the low critical solution temperatures (LCSTs) of thermo-responsive polymer brushes grafted on single-walled carbon nanotubes (SWCNTs), and to study the LCST-dependent drug-loading and drug-release properties of these polymer-modified SWCNTs. The copolymers grafted on SWCNTs are retrieved by 1 M NaOH to evaluate their molecular weights and LCSTs. Additionally, the pristine properties of SWCNTs are preserved.

    6. Supramolecular polymer gels formed from carboxy-terminated telechelic polybutadiene and polyamidine through amidinium-carboxylate salt bridge (pages 1815–1824)

      Yoshio Furusho and Takeshi Endo

      Article first published online: 11 APR 2014 | DOI: 10.1002/pola.27187

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      The amidinium-carboxylate salt bridge-based supramolecular polymer gels are prepared from a carboxy-terminated telechelic polybutadiene and a linear polyamidine having N,N′-di-substituted acetamidine groups in the main chain. The supramolecular polymer gel containing equimolar amounts of the carboxyl group and the amidine group show virtually no fluidity, having a high storage modulus (G′) value of about 1 MPa at room temperature.

    7. Spotlight Article

      Synthesis and properties of long-chain branched poly(ether sulfone)s by self-polycondensation of AB2 type macromonomers (pages 1825–1831)

      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.

    8. Selective nucleophilic additions to poly(methacrylate)s containing isothiocyanate moieties in the side chains and their application in cross-linking (pages 1832–1842)

      Ryota Seto, Kozo Matsumoto and Takeshi Endo

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

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      The reactivity of an isothiocyanate moiety containing polymethacrylate in the side chain with an 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 conditions applied to the amines. Addition of an alcohol or thiol to the isothiocyanate needs catalysts. A diamine or diol was added to the isothicyanates to prepare networked polymers.

    9. Acrylate nanolatex via self-initiated photopolymerization (pages 1843–1853)

      Florent Jasinski, Emeline Lobry, Lénaïg Lefevre, Abraham Chemtob, Céline Croutxe-Barghorn, Xavier Allonas and Adrien Criqui

      Article first published online: 11 APR 2014 | DOI: 10.1002/pola.27190

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      Low-scattering monomer miniemulsions have recently emerged as a suitable system for the development of efficient photopolymerization heterogeneous processes. UV light is exploited to cause the self-photoinitiation of acrylate miniemulsions at ambient temperature. The result is the fast production of less-toxic nanolatexes without initiator residue, making them particularly suitable for medical or microelectronic applications. Topics, such as stability, up-scaling in photoreactors and the self-initiation mechanism are covered.

    10. Alkylamines-intercalated α-zirconium phosphate as latent thermal anionic initiators (pages 1854–1861)

      Osamu Shimomura, Keisuke Maeno, Atsushi Ohtaka, Shunro Yamaguchi, Junko Ichihara, Kiyoko Sakamoto and Ryôki Nomura

      Article first published online: 14 APR 2014 | DOI: 10.1002/pola.27191

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      The reaction of glycidyl phenyl ether (GPE) with α-zirconium phosphate (α-ZrP) intercalated 1-aminoalkanes 1-aminopropane (α-ZrP·Pr), 1-aminobutane (α-ZrP·Bu), 1-aminooctane (α-ZrP·Oct), and 1-aminohexadecane (α-ZrP·Hed) was carried out and these intercalation compounds performed well as latent thermal initiators. Especially, α-ZrP·Hed has the potential to initiate the reaction on heating while remaining stable during storage around ambient temperature.

    11. 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 (pages 1862–1868)

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

    12. Preparation of perfluoro-1,3-propanedisulfonic acid/Nafion/silica hybrid nanoparticles—thermally stable Nafion in these silica hybrid nanoparticles even after calcination at 800 °C (pages 1869–1877)

      Saki Soma, Yohei Mizuguchi, Masashi Sugiya and Hideo Sawada

      Article first published online: 22 APR 2014 | DOI: 10.1002/pola.27195

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      Perfluoro-1,3-propanedisulfonic acid/Nafion/SiO2 hybrid nanoparticles after calcination at 800 °C can exhibit stronger acidity and higher proton conductivity than those before calcination and are applicable to the Friedel-Crafts acylation.

    13. Spotlight Article

      Importance of compositional homogeneity of macromolecular chains for UCST-type transitions in water: Controlled versus conventional radical polymerization (pages 1878–1884)

      Beatriz A. Pineda-Contreras, Fangyao Liu and Seema Agarwal

      Article first published online: 21 APR 2014 | DOI: 10.1002/pola.27196

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      This article provides a new example of a polymer showing upper critical solution temperature (UCST)-type transitions based on acrylamide and styrene copolymers. The compositional homogeneity of macromolecular chains provided by controlled radical polymerization together with optimized sample preparation conditions led to UCST-type behavior in contrast to the nonthermoresponsive properties of the same materials made by conventional radical polymerization. Since examples of polymeric systems showing UCST in water are rare, this work would help in developing more systems with tuned UCSTs.

    14. Investigation of proton conductivity of anhydrous proton exchange membranes prepared via grafting vinyltriazole onto alkaline-treated PVDF (pages 1885–1897)

      Deniz Sinirlioglu, Ali Ekrem Muftuoglu, Kurtulus Golcuk and Ayhan Bozkurt

      Article first published online: 21 APR 2014 | DOI: 10.1002/pola.27197

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      Proton exchange membrane (PEM) fuel cells are considered to be a promising technology for clean and efficient power generation in the twenty-first century. The search for thermo-chemically and mechanically stable PEMs with high proton conducting ability for use in high temperature applications has led to the development of novel anhydrous PEMs. A simple approach exploits alkaline-treated PVDF in conjunction with vinyltriazole in a “grafting through” method to obtain PEMs.

    15. Fabrication of a nanohybrid of conjugated polymer nanoparticles and graphene oxide for biosensing of trypsin (pages 1898–1904)

      Jaeguk Noh, Byung-Jae Chae, Bon-Cheol Ku and Taek Seung Lee

      Article first published online: 28 APR 2014 | DOI: 10.1002/pola.27215

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      A series of conjugated polymers with the triphenylamine group has been synthesized. These polymers exhibit various emission colors according to the composition. The resultant conjugated polymer nanoparticles (CPN) are exploited as a fluorescence turn-on biosensor for trypsin detection with high selectivity via controlling interactions between CPNs and graphene oxide (GO) in the presence of polyarginine, which acts as a linker between CPN and GO, as well as a site hydrolyzable by trypsin.

  3. Note

    1. Top of page
    2. Cover Image
    3. Articles
    4. Note
    1. You have free access to this content
      Synthesis and solid-state self-assembly of poly(ethylene glycol)-b-poly(γ-benzyl-l-glutamate)s and single-walled carbon nanotubes (pages 1905–1915)

      Haoyu Tang, Ying Ling, Yong Deng and Donghui Zhang

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

      Thumbnail image of graphical abstract

      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 nanotubes (SWCNT) causes an increase of the d-spacing of both lamellar and hexagonal packing, suggesting that in the intercalation of SWCNTs into the PEG-b-PBLGs matrices, the SWCNTs are oriented normal to the lamellar interface.

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