Journal of Polymer Science Part A: Polymer Chemistry

Cover image for Vol. 53 Issue 5

1 March 2015

Volume 53, Issue 5

Pages i–iv, 615–718

  1. Cover Image

    1. Top of page
    2. Cover Image
    3. Rapid Communication
    4. Articles
    1. You have free access to this content
      Cover Image, Volume 53, Issue 5 (pages i–ii)

      Article first published online: 28 JAN 2015 | DOI: 10.1002/pola.27537

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      This SEM image shows the microstructure of a chemically cross-linked hydrogel and reveals the porous and interconnected microstructure of a hydrogel sample where the pores, prior to freeze-drying, are filled with water. On page 699 (DOI: 10.1002/pola.27495), Clara García-Astrain, Alessandro Gandini, Itxaso Algar, Arantxa Eceiza, María Ángeles Corcuera, and Nagore Gabilondo report on the preparation of polymethacrylate-based hydrogels and crosslinked using the Diels-Alder reaction. Poly(2-aminoethyl methacrylate) hydrochloride is modified with furfural to obtain a polymer with pendant diene moieties, which is then cross-linked using polyetheramine-based bismaleimides acting as bisdienophiles. A simple method is developed for the preparation of hydrogels in aqueous media through a catalyst-free “click” reaction, i.e, a process with green chemistry connotations.

    2. You have free access to this content
      Cover Image, Volume 53, Issue 5 (pages iii–iv)

      Article first published online: 28 JAN 2015 | DOI: 10.1002/pola.27538

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      On page 709 (DOI: 10.1002/pola.27500), Hiroki Mori, Masato Suetsugu, Ning-hui Chang, Shuhei Nishinaga, Hikaru Nonobe, Yasuhiro Okuda, and Yasushi Nishihara report the synthesis and characterization of semiconducting polymers combining phenanthro[1,2-b:8,7-b‘]dithiophene (PDT) with diketopyrrolopyrrole (DPP). The introduction of the PDT core with rigid and extended π-electron systems into the polymer backbone leads to strong aggregation behavior, a high thermal stability, and short π–π stacking distances (3.5–3.6 Å). However, such strong intermolecular interaction decreases solubility and molecular weights, resulting in low crystalline nature and a moderate field-effect mobility of 0.01 cm2 V−1 s−1. Furthermore, such strong aggregation behavior leads to large-scale phase separation in the blended films, resulting in low solar cell performance with a PCE of 2.0%.

  2. Rapid Communication

    1. Top of page
    2. Cover Image
    3. Rapid Communication
    4. Articles
    1. Highly sensitive fluorescent polyamide for detection of Hg2+, Hg+, Fe3+, and Fe2+ ions (pages 615–621)

      Yun Yu, Xinjian Cheng, Honglin Liu, Shuangying Gu, Zhuoni Jiang, Hui Huang and Jiansheng Lian

      Article first published online: 16 DEC 2014 | DOI: 10.1002/pola.27489

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      A chemosensor derived from R6G was prepared and introduced to polyamide (PA). The as-prepared PA showed high sensitivity to some heavy metal ions. Both the color and the fluorescence changed immediately after the addition of heavy metal ions.

  3. Articles

    1. Top of page
    2. Cover Image
    3. Rapid Communication
    4. Articles
    1. Hybridization of emitting polyfluorene with silicone (pages 622–628)

      Shinji Nishikawa, Sayaka Kami, Nurul Ashikin, Badrul Haswan, Takahiro Uno, Takahito Itoh and Masataka Kubo

      Article first published online: 22 DEC 2014 | DOI: 10.1002/pola.27493

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      Emitting polyfluorenes with pendant ethoxysilyl groups were prepared. Hydrolysis and polycondensation of tetraethoxysilane and silanol-terminated polydimethylsiloxane in the presence of the ethoxysilyl-functionalized polyfluorenes gave transparent luminescent silicones. Fluorescent spectra of these silicones revealed that emitting polymers were dispersed homogeneously in the matrix of silicone without aggregation. Since alternated incorporation of arylene moieties in fluorene-based π-conjugated polymers leads to the tunability of the emitting properties, fluorene/silicone hybrids are interesting candidates for various optical materials.

    2. Ionic conductivity probed in main chain liquid crystalline azobenzene polyesters (pages 629–641)

      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. Spotlight Article

      Synthesis and crystallization of star-shaped photocleavable poly(ε-caprolactone)s (pages 642–649)

      Ajay S. Kasegaonkar, Haitham Barqawi and Wolfgang H. Binder

      Article first published online: 16 DEC 2014 | DOI: 10.1002/pola.27486

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      A multivalent photocleavable initiator for the polymerization of lactones yielding photocleavable three arm-star poly(ε-caprolactone)s is reported, in turn enabling to change the star-architecture of the synthesized polymer by irradiation with UV light. Besides 1H NMR, HPLC, and ESI-TOF-MS, which clearly support the structure of the synthesized photocleavable star-shaped poly(ε-caprolactone), DSC studies prove the successful removal of the topological constraint in the star-shaped poly(ε-caprolactone) polymers, in turn enhancing the crystallinity of the irradiated polymer.

    4. Polymer/clay nanocomposites through multiple hydrogen-bonding interactions (pages 650–658)

      Muhammed Aydin, Tamer Uyar, Mehmet Atilla Tasdelen and Yusuf Yagci

      Article first published online: 16 DEC 2014 | DOI: 10.1002/pola.27487

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      Polymer/clay nanocomposites are successfully prepared by multiple hydrogen-bonding interactions of the intercalated 2-ureido-4[1H]pyrimidinone (UPy)-functionalized organoclay and UPy-end functionalized polymers. The self-complimentary quadruple hydrogen bonding could gradually push the layers apart, leading to delamination of clay tactoids and lead to formation of nanocomposites. Spectroscopic and microscopic investigations reveal a mixed morphology with partial intercalation/exfoliation, which depends on the concentration of clay. The TGA and DSC results confirm that the thermal stability of the nanocomposites higher than pristine polymers.

    5. Spotlight Article

      New acid/base salts as co-catalysts for the organocatalyzed ring opening polymerization of lactide (pages 659–664)

      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.

    6. Naphthalimide-phthalimide derivative based photoinitiating systems for polymerization reactions under blue lights (pages 665–674)

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

      Article first published online: 16 DEC 2014 | DOI: 10.1002/pola.27490

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      Amino-functional-group-substituted naphthalimide-phthalimide derivatives (NDPD) can be incorporated in the photoinitiating systems with various additives to initiate both the cationic polymerization of epoxides and/or the radical polymerization of acrylates upon exposure to blue lights. The photobleaching property of the NDPD could endow the related formulations with potential applications in the manufacture of colorless coatings.

    7. Spotlight Article

      Synthesis of functional block copolymers and terpolymers containing polyglycidyl methacrylate blocks (pages 675–684)

      Susanne Höhne and Petra Uhlmann

      Article first published online: 22 DEC 2014 | DOI: 10.1002/pola.27491

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      Triblock terpolymers with a glycidyl methacrylate block, a hydrophobic methyl methacrylate, and a latent hydrophilic tert-butyl acrylate block are prepared by ATRP. The terpolymers show narrow molecular weight distributions and the polymerization process is well controlled if the polymers are built up from the acrylate block. As shown by differential scanning calorimetry, the single blocks in the terpolymers show different glass points depending on length.

    8. Ethylene–propylene copolymerization behavior of ansa-dimethylsilylene(fluorenyl)(amido)dimethyltitanium complex: Application to ethylene–propylene–diene or ethylene–propylene–norbornene terpolymers (pages 685–691)

      Ryo Tanaka, Issei Kamei, Zhengguo Cai, Yuushou Nakayama and Takeshi Shiono

      Article first published online: 22 DEC 2014 | DOI: 10.1002/pola.27494

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      Copolymerization behavior of ethylene (E) and propylene (P) using ansa-dimethylsilylene(fluorenyl)(amido)dimethyltitanium complex was investigated. The monomer reactivity ratios rE and rP were close to 1, indicating that monomer sequence distribution is uniform even at the high conversion of batchwise polymerization. The terpolymerizations of E, P, and norbornene (NB) or 5-ethylidene-2-norbornene (5E2N) were also performed. NB/P content in the copolymer was independently controlled by the initial concentration of NB and E/P feed ratio. Glass transition temperature (Tg) of the terpolymer was only related to NB content regardless of E/P content ratio and the same with that of the corresponding NB/E random copolymer.

    9. Synthesis of polyisocyanurates by thermal rearrangement of polycyanurates (pages 692–698)

      Kousuke Tsuchiya, Eisuke Goto, Yoshihito Ishida, Tomoya Higashihara, Atsushi Kameyama and Mitsuru Ueda

      Article first published online: 22 DEC 2014 | DOI: 10.1002/pola.27492

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      Polycyanurates prepared from 2,4-dichloro-6-methoxy-1,3,5-triazine and bisphenol monomers are successfully rearranged to polyisocyanurates with high temperature thermal treatment in the presence of a small amount of tetrabutyl ammonium bromide as a catalyst in an argon atomosphere. The resulting polyisocyanurates produce the transparent and amorphous films and show a good thermal stability with 5% weight loss temperature above 340 °C in nitrogen and the glass transition temperature above 210 °C.

    10. Hydrogel synthesis by aqueous Diels-Alder reaction between furan modified methacrylate and polyetheramine-based bismaleimides (pages 699–708)

      Clara García-Astrain, Itxaso Algar, Alessandro Gandini, Arantxa Eceiza, María Ángeles Corcuera and Nagore Gabilondo

      Article first published online: 22 DEC 2014 | DOI: 10.1002/pola.27495

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      Chemically crosslinked hydrogels have been prepared using Diels-Alder reaction in aqueous media between furan modified poly(2-aminoethyl methacrylate) and Jeffamine®-based bismaleimides.

    11. Synthesis, characterization, and solar cell and transistor applications of phenanthro[1,2-b:8,7-b′]dithiophene–Diketopyrrolopyrrole semiconducting polymers (pages 709–718)

      Hiroki Mori, Masato Suetsugu, Shuhei Nishinaga, Ning-hui Chang, Hikaru Nonobe, Yasuhiro Okuda and Yasushi Nishihara

      Article first published online: 6 JAN 2015 | DOI: 10.1002/pola.27500

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      A series of phenanthro[1,2-b:8,7-b′]dithiophene (PDT)-based semiconducting polymers was synthesized and characterized. The present polymers showed some superior features such as strong aggregation behavior, high thermal stability, short π–π stacking (3.6 Å), and extended absorption up to 1000 nm. However, such strong intermolecular interaction reduced their solubility and molecular weights, leading to low crystalline nature and moderate field-effect mobility of 0.01 cm2 V−1 s−1. Furthermore, such strong aggregation behavior led to the large-scale phase separation in the blend films, limiting Jsc and PCE of 2.0%.