Journal of Polymer Science Part A: Polymer Chemistry

Cover image for Vol. 52 Issue 20

15 October 2014

Volume 52, Issue 20

Pages i–iv, 2861–3003

  1. Cover Image

    1. Top of page
    2. Cover Image
    3. Highlights
    4. Rapid Communications
    5. Articles
    1. You have free access to this content
      Cover Image, Volume 52, Issue 20 (pages i–ii)

      Article first published online: 8 SEP 2014 | DOI: 10.1002/pola.27382

      Thumbnail image of graphical abstract

      On page 2976 (DOI: 10.1002/pola.27341), David Pahovnik, Milijana Grujić, Mateja Cegnar, Janez Kerč, and Ema Žagar report the synthesis of hydrophobically-modified, negatively-charged, water-soluble poly(sodium glutamate)s with different content of octyl grafts, which are used in combination with oppositely charged N,N,N-trimethyl chitosan for the preparation of GCSF protein nanoparticles by the polyelectrolyte complexation method. The hydrophobic grafts on poly(sodium glutamate)s contribute significantly to association efficiency with GCSF protein, whereas subsequently added N,N,N-trimethyl chitosan solution results in the formation of much more defined nanoparticles.

    2. You have free access to this content
      Cover Image, Volume 52, Issue 20 (pages iii–iv)

      Article first published online: 8 SEP 2014 | DOI: 10.1002/pola.27383

      Thumbnail image of graphical abstract

      The polymerization of poly(ε-caprolactone) on the surface of PEGlycated Fe3O4@SiO2 creates a hybrid material with potential application as contrast agent and vehicle for transporting highly insoluble drugs in aqueous media. On page 2966 (DOI: 10.1002/pola.27338), David Serrano-Ruiz, Paulino Alonso-Cristobal, Diego Mendez-Gonzalez, Marco Laurenti, Raúl Olivero-David, Enrique López-Cabarcos, and Jorge Rubio-Retama report on the nano-segregation that the poly(ε-caprolactone) and PEG chains suffer on the surface of the particles. In this scenario, the poly(ε-caprolactone) collapses on the surface, creating hydrophobic pockets that can encapsulate hydrophobic drugs. The PEG chains enrich the top and provide colloidal stability to the entire system. The image depicts polymer brushes formed by poly(ecaprolactone) and poly(ethylene glycol) grafted on Fe3O4@SiO2 nanoparticles.

  2. Highlights

    1. Top of page
    2. Cover Image
    3. Highlights
    4. Rapid Communications
    5. Articles
    1. You have free access to this content
      Well-defined copolymers based on poly(vinylidene fluoride): From preparation and phase separation to application (pages 2861–2877)

      Vincent S. D. Voet, Gerrit ten Brinke and Katja Loos

      Article first published online: 6 AUG 2014 | DOI: 10.1002/pola.27340

      Thumbnail image of graphical abstract

      Poly(vinylidene fluoride) (PVDF), exhibiting extraordinary physical, mechanical, and ferroelectric properties, is nowadays the second largest fluoropolymer in demand. Copolymerization of vinylidene fluoride with other fluoromonomers already resulted in a wide variety of commercial products. Well-defined block copolymers based on PVDF are potential precursors for functional nanostructured materials, and can find application in thermoplastic elastomers, membranes, surfactants and microelectronic devices. This Highlight provides an overview of the synthesis routes towards these materials and discusses their phase behavior and (potential) applications.

    2. You have free access to this content
      Photoinitiated atom transfer radical polymerization: Current status and future perspectives (pages 2878–2888)

      Sajjad Dadashi-Silab, Mehmet Atilla Tasdelen and Yusuf Yagci

      Article first published online: 6 AUG 2014 | DOI: 10.1002/pola.27327

      Thumbnail image of graphical abstract

      For environmental and practical issues, various initiation techniques involving in situ generation of Cu(I) have been reported to accomplish atom transfer radical polymerization (ATRP) in more realistic condition. The required Cu(I) catalyst for the ATRP can be generated by several approaches involving chemical, electrochemical, copper-containing nanoparticles, and photochemical redox processes. Considering the extensive applications of the process, the photochemically mediated ATRP bring several distinct advantages, including temporal and spatial controls, rapid and energy efficient activation.

  3. Rapid Communications

    1. Top of page
    2. Cover Image
    3. Highlights
    4. Rapid Communications
    5. Articles
    1. Free radical initiation mechanism based on the combination of alcohol initiators and borane activators (pages 2889–2893)

      Masahiro Ohkura and T. C. Mike Chung

      Article first published online: 7 AUG 2014 | DOI: 10.1002/pola.27337

      Thumbnail image of graphical abstract

      A free radical initiation(R′[BOND]O[BOND]BR2) system is based on a combination of an alcohol (R′[BOND]OH) initiator and a dialkylborane (H[BOND]BR2) activator. Due to an empty p-orbital in the B atom, the C[BOND]O bond can be cleaved to form a reactive C• radical for initiating radical polymerization, while the stable •O[BOND]BR2 radical remains inactive. Considering the large availability of various alcohol moieties, this asymmetric initiation chemistry can be applied to supermolecular structures and surface modifications.

    2. You have free access to this content
      Poly(divinylbenzene-alt-maleic anhydride) nanoparticles as a novel stabilizer for Pickering polymerization of styrene (pages 2894–2898)

      Jian He, Dong Chen, Kai Han, Xiaoxia Huang, Liwei Wang, Jianyuan Deng and Wantai Yang

      Article first published online: 11 AUG 2014 | DOI: 10.1002/pola.27339

      Thumbnail image of graphical abstract

      Poly(divinylbenzene-alt-maleic anhydride) nanoparticles with a narrow distribution and a diameter of 30 nm act as novel stabilizers in the Pickering emulsion polymerization of styrene. The hydrolyzed PDMNPs with NaHCO3 aqueous solution exhibited a very effective emulsification performance and a remarkably high emulsification efficiency. Raspberry-like PDMNPs/PS composite polymer particles have been successfully fabricated via copolymerization of pendant vinyl groups of PDMNPs with styrene.

  4. Articles

    1. Top of page
    2. Cover Image
    3. Highlights
    4. Rapid Communications
    5. Articles
    1. Synthesis and thermal, optical, and mechanical properties of sequence-controlled poly(1-adamantyl acrylate)-block-poly(n-butyl acrylate) containing polar side group (pages 2899–2910)

      Yoshinori Nakano, Eriko Sato and Akikazu Matsumoto

      Article first published online: 31 JUL 2014 | DOI: 10.1002/pola.27322

      Thumbnail image of graphical abstract

      Thermal, optical, and mechanical properties of the adamantane-containing block copolymers consisting of poly(1-adamantyl acrylate) and poly(n-butyl acrylate) sequences, prepared by the sequence-controlled block copolymerization using organotellurium-mediated living radical polymerization, are described. The increases in the glass transition temperatures and activation energies due to the formation of intermolecular hydrogen bonding by the introduction of polar repeating units as well as their effects on the tensile elasticity, strength, and strain are discussed.

    2. Self-healing of poly(propylene oxide)-polybenzoxazine thermosets by photoinduced coumarine dimerization (pages 2911–2918)

      Baris Kiskan and Yusuf Yagci

      Article first published online: 25 JUL 2014 | DOI: 10.1002/pola.27323

      Thumbnail image of graphical abstract

      A self-healing strategy for poly(propylene oxide)s bearing coumarine-benzoxazine units (PPO-CouBenz)s based on light induced coumarine dimerization reactions is described. The coumarine groups present in the structure undergo efficient dimerization upon irradiation at λ > 300 nm as confirmed by the UV–Vis spectral investigations. Photoinduced healing of coumarin based cured PPO-CouBenz polymer films was investigated.

    3. Poly(vinylphosphonate)s functionalized polymer microspheres via rare earth metal-mediated group transfer polymerization (pages 2919–2925)

      Jiming Yang, Yongjiu Liang, Stephan Salzinger, Ning Zhang, Dewen Dong and Bernhard Rieger

      Article first published online: 25 JUL 2014 | DOI: 10.1002/pola.27324

      Thumbnail image of graphical abstract

      A facile and efficient method is demonstrated for the functionalization of polymer microspheres with biocompatible poly(vinylphosphonate)s via the combination of UV-induced photopolymerization and rare-earth metal catalyzed group transfer polymerization (GTP). The surface-initiated GTP leads to a constant and remarkably rapid weight gain of the microsphere, and the accumulated tension between polymer chains induces an unprecedented fracture of the microsphere for longer polymerization time.

    4. Synthesis and characterization of isoindigo-based polymers using CH-arylation polycondensation reactions for organic photovoltaics (pages 2926–2933)

      Walaa Elsawy, Hongkyu Kang, Kilho Yu, Ahmed Elbarbary, Kwanghee Lee and Jae-Suk Lee

      Article first published online: 6 AUG 2014 | DOI: 10.1002/pola.27328

      Thumbnail image of graphical abstract

      A series of three new low bandgap donor–acceptor–donor–acceptor/(D–A–D–A/) polymers have been successfully synthesized for photovoltaic application, based on the combination of isoindigo as the electron-deficient acceptor and 3,4-ethylenedioxythiophene as the electron-rich donor, followed by CH-arylation with different acceptors (4,7-dibromo[c][1,2,5]-(oxa, thia and/or selena)diazole(4a-c)).

    5. “Kick-Starting” oxetane photopolymerizations (pages 2934–2946)

      James V. Crivello

      Article first published online: 8 AUG 2014 | DOI: 10.1002/pola.27329

      Thumbnail image of graphical abstract

      The photoinitiated cationic ring-opening polymerizations of oxetane monomers exhibit long induction periods that make them unsuitable for many high-speed applications; 2,2-dialkyl-, 2,2,3-trialkyl- and 2,2,3,3,-tetraalkyl epoxides, as for example limonene dioxide and other terpene oxides, markedly accelerate oxetane photopolymerizations even at low concentrations. To account for these effects, a mechanism involving a modification of the initiation step of the ring-opening oxetane polymerization by the epoxide was proposed.

    6. Synthesis and characterization of multiblock sulfonated poly(arylene ether sulfone) membranes with different hydrophilic moieties for application in polymer electrolyte membrane fuel cell (pages 2947–2957)

      Jinju Ahn, Hyejin Lee, Tae-Hyun Yang, Chang-Soo Kim and Byungchan Bae

      Article first published online: 6 AUG 2014 | DOI: 10.1002/pola.27330

      Thumbnail image of graphical abstract

      Multiblock sulfonated poly(arylene ether sulfone)s were synthesized to investigate the structural effects on their membrane properties. Three different types of sulfonated hydrophilic blocks were used; their structures possessed different acidity and local concentration of sulfonic acid groups. The higher acidity and concentration of sulfonic acid groups resulted in higher proton conductivity under certain relative humidity conditions and phase.

    7. Conjugated polymer with rigid donor poly(para-divinylphenylamino) backbone and pendant cyanoacetic acid acceptor for dye sensitized solar cells (pages 2958–2965)

      Zhen Fang, Danlu Wu, Shahar Keinan and Bin Liu

      Article first published online: 6 AUG 2014 | DOI: 10.1002/pola.27334

      Thumbnail image of graphical abstract

      A conjugated polymer with donor backbone and acceptor side group has been synthesized and utilized for dye-sensitized solar cells. The introduction of vinylene link in the polymer backbone leads to a broad absorption spectrum. DFT modeling suggests an efficient charge separation upon irradiation, which favors the electron injection to TiO2 conduction band. The DSSC cell exhibits a high peak IPCE and J-V response, with an overall power conversion efficiency of 3.67%.

    8. Nanosegregated polymeric domains on the surface of Fe3O4@SiO2 particles (pages 2966–2975)

      David Serrano-Ruiz, Paulino Alonso-Cristobal, Diego Mendez-Gonzalez, Marco Laurenti, Raúl Olivero-David, Enrique López-Cabarcos and Jorge Rubio-Retama

      Article first published online: 6 AUG 2014 | DOI: 10.1002/pola.27338

      Thumbnail image of graphical abstract

      Mixed polymer brushes of PEG and PCL have been synthesized on the surface of magnetic silica nanoparticles using “grafting to” and “grafting from” techniques. The ratio between the Mw of each polymer defines the polymer segregation on the surface as well as the colloidal stability. When the PEG/PCL ratio is >1, the particles become colloidally stable in aqueous media and can be used as vehicles for high insoluble drugs.

    9. Synthesis of alkyl-modified poly(sodium glutamate)s for preparation of polymer-protein nanoparticles in combination with N,N,N-trimethyl chitosan (pages 2976–2985)

      David Pahovnik, Milijana Grujić, Mateja Cegnar, Janez Kerč and Ema Žagar

      Article first published online: 6 AUG 2014 | DOI: 10.1002/pola.27341

      Thumbnail image of graphical abstract

      A series of hydrophobically modified, negatively charged, water-soluble poly(sodium glutamate)s with different content of octyl grafts were synthesized and used in combination with oppositely charged N,N,N-trimethyl chitosan (TMC) for the preparation of GCSF protein nanoparticles (NPs) by polyelectrolyte complexation method. The effects of degree of poly(sodium glutamate)'s hydrophobic modification and specific preparation conditions on the association efficiency (AE) and final loading of protein in the complexes were studied. The results reveal that, beside electrostatic interaction, the hydrophobic grafts on poly(sodium glutamate)s significantly contribute to AE with GCSF protein, whereas subsequently added TMC solution results in formation of much more defined NPs.

    10. Cationic polymerization of a novel oxetane-bearing ionic liquid structure and properties of the obtained poly(ionic liquid) (pages 2986–2990)

      Kozo Matsumoto, Tomoaki Chijiiwa and Takeshi Endo

      Article first published online: 6 AUG 2014 | DOI: 10.1002/pola.27342

      Thumbnail image of graphical abstract

      An ionic liquid having an oxetanyl group (OXImTFSI) was synthesized and cationically polymerized. The obtained poly(ionic liquid), polyOXImTFSI, showed high thermal stability, low glass transition temperature, and ionic conductivity.

    11. Evaluation of proton conductivity of sulfonated polyimide/dihydroxy naphthalene charge-transfer complex hybrid membranes (pages 2991–2997)

      Liana Christiani, Sandra Hilaire, Kazunari Sasaki and Masamichi Nishihara

      Article first published online: 14 AUG 2014 | DOI: 10.1002/pola.27343

      Thumbnail image of graphical abstract

      Polymer coupling reactions are some of the most challenging chemical transformations due to low end-group concentration, steric hindrance, and decreased reactivity. Thiol-yne chemistry is shown to be a near-quantitative and selective strategy for the coupling of preformed polymers to give block and graft copolymers. With aromatic alkynes under a wide range of conditions, specific monoaddition is achieved with efficiencies surpassing those of traditional thiol-ene chemistry.

    12. One-Pot synthesis of functional poly(methacrylate) by ATRP and 1,8-Diazacyclo-[5,4,0]undec-7-ene catalyzed transesterification (pages 2998–3003)

      Jinbao Xu, Weizhen Lian, Stergios Pispas and Guangzhao Zhang

      Article first published online: 25 AUG 2014 | DOI: 10.1002/pola.27346

      Thumbnail image of graphical abstract

      A facile one-pot process has been developed for the synthesis of functional poly(methacrylate)s by the organic 1,8-diazacyclo-[5,4,0]undec-7-ene (DBU) catalyzed trans-esterification and ATRP. The two reactions are carried out without interference and the obtained polymers have controllable molecular weights with narrow dispersity.

SEARCH

SEARCH BY CITATION