Journal of Polymer Science Part A: Polymer Chemistry

Cover image for Vol. 53 Issue 3

1 February 2015

Volume 53, Issue 3

Pages i–iv, 393–512

  1. Cover Image

    1. Top of page
    2. Cover Image
    3. Articles
    4. Errata
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      Cover Image, Volume 53, Issue 3 (pages i–ii)

      Article first published online: 22 DEC 2014 | DOI: 10.1002/pola.27508

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      The cover shows the aggregation of pristine TiO2 nanoparticles in a PMMA-b-PS block copolymer (BCP) thin film matrix. On page 468 (DOI: 10.1002/pola.27460), Shimelis T. Hailu, Saumil Samant, Christopher Grabowski, Michael Durstock, Alamgir Karim, and Dharmaraj Raghavan report that functionalization of the TiO2 by end grafting PMMA-b-PS ligands results in highly dispersed TiO2 within the BCP matrix, while maintaining BCP domain ordering. Dispersion of TiO2 is facilitated by end-grafted BCP ligands, identical to the BCP matrix. The TiO2 nanoparticle size is relatively large in comparison to individual BCP domains, yet they are well dispersed, with ligands spanning both blocks due to an interplay of enthalpic and entropic factors.

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      Cover Image, Volume 53, Issue 3 (pages iii–iv)

      Article first published online: 22 DEC 2014 | DOI: 10.1002/pola.27509

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      The cover shows a TEM image of micelles formed by mixing a poly(methylmethacrylate)-block-poly(4-vinylpyridine)-block-polystyrene triblock terpolymer with a poly(acrylic acid) homopolymer in tetrahydrofuran (a 1:1 poly(4-vinylpyridine/poly(acrylic acid) molar ratio is used). On page 459 (DOI: 10.1002/pola.27471), Claire Guerlain, Sandie Piogé, Christophe Detrembleur, Charles-André Fustin, and Jean-François Gohy report that hydrogen bonded complexes are formed between the poly(4-vinylpyridine) and poly(acrylic acid) blocks. These complexes are insoluble in the used solvent and further aggregate into micellar cores. The shells of those micelles are formed by the soluble poly(methyl-methacrylate) and polystyrene blocks.

  2. Articles

    1. Top of page
    2. Cover Image
    3. Articles
    4. Errata
    1. Spotlight Article

      Comparing linear and cyclic synthetic homopolypeptides: Synthesis and molecular characterization (pages 393–404)

      Nikolaos Politakos, George Liontos, Galder Kortaberria, Jamie M. Messman, Javier Calvo, Sergio E. Moya, Jimmy W. Mays and Apostolos Avgeropoulos

      Article first published online: 24 OCT 2014 | DOI: 10.1002/pola.27434

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      The successful synthesis and characterization of linear and cyclic poly(o-Bn-l-Tyr) are described. The verification of the cyclic architecture was accomplished by various molecular characterization techniques. Special attention is given to the behavior and specific shifts in NMR spectroscopy experiments given by characteristic groups/bonds on the cyclic versus the linear corresponding homopolypeptide.

    2. Novel heterocyclic poly(pyridine-imide)s with unsymmetric carbazole substituent and noncoplanar structure: High thermal, mechanical and optical transparency, electrochemical, and electrochromic properties (pages 405–412)

      Ying-Chi Huang, Kun-Li Wang, Wei-Yi Lee, Yi-An Liao, Der-Jang Liaw, Kueir-Rarn Lee and Juin-Yih Lai

      Article first published online: 21 NOV 2014 | DOI: 10.1002/pola.27438

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      Diamine-containing pyridine and unsymmetrical carbazole groups were synthesized via a Chichibabin reaction and subsequent reduction, and used in the preparation of poly(pyridine-imide)s PI-1–8. When the HCl concentration was increased, a new absorption band appeared at approximately 350 nm, and the intensity of the fluorescent peak at 380 nm observed in the neutral polymer solution decreased, along with the appearance of the new fluorescent peak at 540 nm.

    3. Synthesis and characterization of copoly(amide triazole)s derived from d-Glucose (pages 413–421)

      Manuel Bueno-Martínez, Inmaculada Molina-Pinilla, Khalid Hakkou and Juan A. Galbis

      Article first published online: 27 OCT 2014 | DOI: 10.1002/pola.27444

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      Several degradable linear copoly(amide triazole)s have been prepared by thermal cycloaddition reactions starting from monomers derived from natural regrowing resources. The copolymers have different characteristics like hydrophilicity, solubility, or thermal properties depending on the ratio of the monomers in the polymer chain or on the procedure used to their preparation. The copolymers contain free secondary alcohol functions that were used to prepare polymeric networks.

    4. Synthesis and characterization of high nitrile content polyimides as dielectric films for electrical energy storage (pages 422–436)

      David H. Wang, Brian A. Kurish, Imre Treufeld, Lei Zhu and Loon-Seng Tan

      Article first published online: 30 OCT 2014 | DOI: 10.1002/pola.27445

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      In the polyimide films, an increase in dipole moment density by the presence of three neighboring CN per repeat unit can increase relative permittivity. Polarization response results implicate that (i) an increase in the number of CN dipoles is insufficient in elevating permittivity proportionally without cooperative alignment of the multiple dipoles; (ii) paraphenylene is more effective than meta-phenylene in enhancing relative permittivity probably because of its greater facility in sub-Tg mobility (“ring flipping”) that aids such cooperative dipole alignment with applied electric field.

    5. Synthesis and asymmetric anionic polymerization of substituted 7-aryl-2,6-dimethyl-1,4-benzoquinone methides (pages 437–444)

      Takahiro Uno, Hiroshi Ohta, Atsushi Yamane, Masataka Kubo and Takahito Itoh

      Article first published online: 7 NOV 2014 | DOI: 10.1002/pola.27449

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      Asymmetric anionic polymerizations of 7-substituted aryl-2,6-dimethyl-1,4-benzoquinone methides (R = p-OMe (2a), p-Cl (2b), m-Cl (2c), and o-Cl (2d)) using the complex of lithium 4-isopropylphenoxide with (−)-sparteine gave the corresponding polymers with negative specific rotation. The largest specific rotation value was obtained in the polymerization of 2d with an electron-withdrawing ortho-chloro substituent.

    6. Spotlight Article

      A benzophenone-naphthalimide derivative as versatile photoinitiator of polymerization under near UV and visible lights (pages 445–451)

      Jing Zhang, Nicolas Zivic, Frédéric Dumur, Pu Xiao, Bernadette Graff, Didier Gigmes, Jean Pierre Fouassier and Jacques Lalevée

      Article first published online: 7 NOV 2014 | DOI: 10.1002/pola.27451

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      A naphthalimide-benzophenone derivative {N-(4-benzophenone)-4-[2-(dimethylamino)ethyl]-1,8-naphthalimide} bearing a tertiary amine group was designed and synthesized. It can be used as a one-component photoinitiator or be incorporated into two-component photoinitiating systems for the free radical polymerization of acrylates as well as the cationic polymerization of epoxides under exposure to various LEDs. This newly developed benzophenone derivative exhibited excellent polymerization efficiency and it was even more efficient than the well-known camphorquinone based systems and the commercial photoinitiator bis(2,4,6-trimethylbenzoyl)-phenylphosphineoxide (BAPO) upon certain irradiation.

    7. Methyl branching in polyethylene from homopolymerization of ethylene with N-arylcyano-β-diketiminate methallyl nickel-B(C6F5)3 (pages 452–458)

      Oleksandra S. Trofymchuk, Griselda Barrera Galland, Marcéo A. Milani and Rene S. Rojas

      Article first published online: 10 NOV 2014 | DOI: 10.1002/pola.27456

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      The N-arylcyano-β-diketiminate methallyl nickel complexes activated with B(C6F5)3 catalyze polymerization of ethylene leading to linear low density polyethylenes with mainly isolated methyl branches. The unique nature of these materials could be an alternative to replace copolymerization of ethylene with propene.

    8. Self-assembly of a triblock terpolymer mediated by hydrogen-bonded complexes (pages 459–467)

      Claire Guerlain, Sandie Piogé, Christophe Detrembleur, Charles-André Fustin and Jean-François Gohy

      Article first published online: 2 DEC 2014 | DOI: 10.1002/pola.27471

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      A poly(methyl methacrylate)-block-poly(4-vinylpyridine)-block-polystyrene (PMMA-b-P4VP-b-PS) triblock terpolymer is synthesized by atom transfer radical polymerization and further mixed with PAA in organic solvents. The self-assembly behavior of this system is compared with the one of a mixture of polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) and poly(methyl methacrylate)-block-poly(methacrylic acid) (PMMA-b-PMAA). Micelles with a core made of P4VP/P(M)AA hydrogen-bonded complexes core surrounded by PS and PMMA coronal chains are obtained in both cases.

    9. Synthesis of highly dispersed, block copolymer-grafted TiO2 nanoparticles within neat block copolymer films (pages 468–478)

      Shimelis T. Hailu, Saumil Samant, Christopher Grabowski, Michael Durstock, Alamgir Karim and Dharmaraj Raghavan

      Article first published online: 24 NOV 2014 | DOI: 10.1002/pola.27460

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      A comparative dispersion study of PMMA-PS-g-nanoparticles showed nanoparticles to be dispersed well in PMMA-PS block copolymer (BCP) and PMMA matrix, but strongly aggregated in PS. Pristine Nanoparticles aggregate in the BCP matrix. These results strongly suggest that dispersion of nanoparticles in the BCP is facilitated by identical BCP end-grafted “ligand” interactions on nanoparticles. In nanocomposite films, the relatively large BCP-g-nanoparticles are preferentially sequestered in ordered domains with ligands spanning both the PS and PMMA domains.

    10. Synthesis and characterization of highly transparent and hydrophobic fluorinated polyimides derived from perfluorodecylthio substituted diamine monomers (pages 479–488)

      Pradip Kumar Tapaswi, Myeon-Cheon Choi, Saravanan Nagappan and Chang-Sik Ha

      Article first published online: 24 NOV 2014 | DOI: 10.1002/pola.27461

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      Two new perfluorodecylthio substituted aromatic diamines, namely 2,4-diamino-1-(1H,1H,2H,2H-perfluorodecathio)benzene (DAPFB) and 2,2'-bis((1H,1H,2H,2H-perfluorodecyl)thio)[1,1'-biphenyl]4,4'-diamine (BPFBD) were synthesized and polycondensed with 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) to produce two new perfluorinated polyimides (PI2 and PI4). A comparative investigation between the perfluorinated PIs (PI2 and PI4) and analogs nonperfluorinated PIs (PI1 and PI3) revealed that PI2 and PI4 exhibited higher solubility, optical transparency, and hydrophobicity but lower moisture absorption, dielectric constant, and thermomechanical properties.

    11. Synthesis of biodegradable thermoplastic elastomers from ε-caprolactone and lactide (pages 489–495)

      Yuushou Nakayama, Kazuki Aihara, Hitomi Yamanishi, Hiroshi Fukuoka, Ryo Tanaka, Zhengguo Cai and Takeshi Shiono

      Article first published online: 24 NOV 2014 | DOI: 10.1002/pola.27463

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      The synthesis and the properties are reported of A-B-A type triblock copolymers, PLLA-block-P(CL-stat-DLLA)-block-PLLA [PLLA = poly(l-lactide)] P(CL-stat-DLLA) = poly(ε-caprolactone-stat-d,l-lactide), as biodegradable thermoplastic elastomers. The DLLA-content of 30 mol % of P(CL-stat-DLLA) was applied because of its amorphous nature and low glass transition temperature. The triblock copolymers showed very high elongation at break and elastic properties. The corresponding d-triblock copolymers, PDLA-block-P(CL-stat-DLLA)-block-PDLAs [PDLA = poly(d-lactide)], were also prepared and blended with PLLA-block-P(CL-stat-DLLA)-block-PLLA to form stereocomplex crystals.

    12. New electroactive and electrochromic aromatic polyamides with ether-linked bis(triphenylamine) units (pages 496–510)

      Sheng-Huei Hsiao and Shou-Lun Cheng

      Article first published online: 25 NOV 2014 | DOI: 10.1002/pola.27465

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      A series of new electroactive aromatic polyamides bearing ether-linked bis(triphenylamine) units were readily prepared from N,N-di(4-aminophenyl)-N′,N′-diphenyl-4,4′-oxydianiline and various aromatic dicarboxylic acids by the phosphorylation polyamidation technique. The polyamides exhibit good solubility in many organic solvents and can be solution-cast into flexible and strong films with high thermal stability. They show well-defined and reversible redox waves during oxidative scanning, with a strong color change from colorless neutral form to green and purple oxidized forms.

  3. Errata

    1. Top of page
    2. Cover Image
    3. Articles
    4. Errata
    1. You have free access to this content
      Erratum: Synthesis of unsaturation containing P(VDF-co-TrFE-co-CTFE) from P(VDF-co-CTFE) in one-pot catalyzed with Cu(0)-based single electron transfer living radical polymerization system (page 511)

      Xin Hu, Shaobo Tan, Guoxin Gao, Yunchuan Xie, Qinzhuo Wang, Na Li and Zhicheng Zhang

      Article first published online: 18 NOV 2014 | DOI: 10.1002/pola.27464

      This article corrects:

      Cover Image, Volume 52, Issue 23

      Vol. 52, Issue 23, i–ii, Article first published online: 27 OCT 2014

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