Journal of Polymer Science Part A: Polymer Chemistry

Cover image for Vol. 53 Issue 7

1 April 2015

Volume 53, Issue 7

Pages i–iv, 831–950

  1. Cover Image

    1. Top of page
    2. Cover Image
    3. Highlight
    4. Rapid Communication
    5. Articles
    1. You have free access to this content
      Cover Image, Volume 53, Issue 7 (pages i–ii)

      Article first published online: 24 FEB 2015 | DOI: 10.1002/pola.27590

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      On page 944 (DOI: 10.1002/pola.27547), Hyeonuk Yeo, Jiye Lee, Munju Goh, Bon-Cheol Ku, Honglae Sohn, and Nam-Ho You describe the synthesis and characterization of the polyimide (PI) series containing a 2,5-bis(4-aminophenylenesulfanyl)-3,4-ethylenedithiothiophene (APSEDTT) moiety in the main-chain. The APSEDTT monomer with high sulfur content was prepared and polymerized with several aromatic dianhydrides. All PIs exhibit high transparency (>75% at 550 nm for a thickness of ∼20 µm) and have good thermal properties [e.g., thermal decomposition temperatures (T10%) of 409–521 °C]. Additionally, the PIs have extraordinarily excellent optical properties in refractive index and birefringence. In particular, the PI derived from APSEDTT and 3SDEA shows a high refractive index (1.7586), and a low birefringence (0.0087) because of their very high sulfur content (27.7%).

    2. You have free access to this content
      Cover Image, Volume 53, Issue 7 (pages iii–iv)

      Article first published online: 24 FEB 2015 | DOI: 10.1002/pola.27591

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      A series of novel materials for fabricating fluorescent holographic micropatterns based on the rare earth complexes using azobenzene-containing poly(aryl ether)s as macromolecular ligands, as demonstrated by Yuxuan Zhang, Jingjing Zhang, Zengduo Cui, Qidai Chen, Haibo Zhang, and Zhenhua Jiang on page 936 (DOI: 10.1002/pola.27521). After being exposed to an interference pattern created by 355 nm laser beams, surface relief gratings are formed on the films of the rare earth complexes. Under the excitation, the regular patterning obtained on Eu3+–containing complexes film exhibits red fluorescence and the regular patterning obtained on Tb3+–containing complexes film exhibit green fluorescence. It is notable that the color of patterns can be tailored easily by tuning the species of the rare earth ions.

  2. Highlight

    1. Top of page
    2. Cover Image
    3. Highlight
    4. Rapid Communication
    5. Articles
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      Exploring the synthesis and impact of end-functional poly(3-hexylthiophene) (pages 831–841)

      Nisha V. Handa, Abigail V. Serrano, Maxwell J. Robb and Craig J. Hawker

      Article first published online: 7 FEB 2015 | DOI: 10.1002/pola.27522

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      In recent years, end-functional poly(3-hexylthiophene) (P3HT) has been instrumental in the continued development and innovation within a variety of areas, particularly organic electronics. P3HT bearing diverse, reactive end groups not only serves as an irreplaceable building block for the preparation of conjugated block copolymers but also facilitates the development of hybrid nanocomposite materials via inorganic surface modification strategies. This Highlight focuses on the impact of end-functional P3HT in these emerging areas of technology.

  3. Rapid Communication

    1. Top of page
    2. Cover Image
    3. Highlight
    4. Rapid Communication
    5. Articles
    1. Spotlight Article

      A facile method for the stain-free visualization of hierarchical structures with electron microscopy (pages 842–845)

      Paul E. Williams, Eric A. Appel, Samuel T. Jones, Jesús Del Barrio, Yang Lan and Oren A. Scherman

      Article first published online: 19 FEB 2015 | DOI: 10.1002/pola.27517

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      Diblock copolymers form hierarchical morphologies with numerous applications in drug delivery and as nanoreactors. Yet, the visualization of these structures by electron microscopy can be extremely difficult, requiring complex staining techniques with associated health risks and the potential to alter structural morphology. Reported here is the synthesis of diblock copolymers by RAFT containing 3,5-bis(trifluoromethyl)phenyl functionality allowing for facile visualization of their resulting hierarchical structures by TEM with no further sample preparation.

  4. Articles

    1. Top of page
    2. Cover Image
    3. Highlight
    4. Rapid Communication
    5. Articles
    1. Spotlight Article

      Synthesis and properties of amphiphilic and biodegradable poly(ε-caprolactone-co-glycidol) copolymers (pages 846–853)

      Jinbao Xu, Jinxian Yang, Xiaodong Ye, Chunfeng Ma, Guangzhao Zhang and Stergios Pispas

      Article first published online: 13 JAN 2015 | DOI: 10.1002/pola.27515

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      Poly(ε-caprolactone-co-tert-butyl glycidyl ether) statistical copolymer has been synthesized with phosphazene (t-BuP4) as the catalyst. Quartz crystal microbalance with dissipation measurements show that the degradation rate of the hydrolyzed amphiphilic copolymer poly(ε-caprolactone-co-glycidol) increases with the content of hydrophilic glycidol segments.

    2. Benzodithiophene-thiophene-based photovoltaic polymers with different side-chains (pages 854–862)

      Thanh Luan Nguyen, Seyeong Song, Seo-Jin Ko, Hyosung Choi, Ji-Eun Jeong, Taehyo Kim, Sungu Hwang, Jin Young Kim and Han Young Woo

      Article first published online: 19 JAN 2015 | DOI: 10.1002/pola.27516

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      Side-chains of photovoltaic polymers need to be multifunctional to induce a deep highest occupied molecular orbital (HOMO) level and chain planarity (for crystalline ordering). This is also necessary for good solution processability.

    3. Molecular heterogeneity of ethylene-propylene rubbers: New insights through advanced crystallization-based and chromatographic techniques (pages 863–874)

      Mohau Justice Phiri, Sadiqali Cheruthazhekatt, Anita Dimeska and Harald Pasch

      Article first published online: 13 JAN 2015 | DOI: 10.1002/pola.27512

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      The molar mass and chemical composition distributions of five ethylene-propylene rubber (EPR) copolymers with high comonomer contents (25–66%) were studied using various advanced analytical techniques. HT-HPLC provided a more comprehensive separation and characterization of both the amorphous and the crystalline TREF fractions as compared with DSC and CRYSTAF, which can only address the crystalline fractions. Preparative TREF provided fractions of different chemical compositions that were subjected to a combination of various analytical methods.

    4. Synthesis, characterization, and application to polymer solar cells of polythiophene derivatives with ester- or ketone-substituted phenyl side groups (pages 875–887)

      Minh Anh Truong, Seijiro Fukuta, Tomoyuki Koganezawa, Yu Shoji, Mitsuru Ueda and Tomoya Higashihara

      Article first published online: 13 JAN 2015 | DOI: 10.1002/pola.27513

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      Four polythiophene derivatives including regiorandom polymers P1, P2, and P3 and a regioregular polymer P4, containing phenyl side chain with electron-withdrawing groups such as an ester and a ketone at the 3-position of thiophene ring, prepared by Stille polycondensation, are applied to p-type semiconducting polymers in bulk heterojunction solar cells. The devices based on the polymer P4 show better photovoltaic performances than those based on other polymers, probably due to the existence of the crystallinity of the regioregular polymer.

    5. Spotlight Article

      Donor–acceptor rod–coil block copolymers comprising poly[2,7-(9,9-dihexylfluorene)-alt-bithiophene] and fullerene as compatibilizers for organic photovoltaic devices (pages 888–903)

      Erika Bicciocchi, Matthias Haeussler, Ezio Rizzardo, Andrew D. Scully and Kenneth P. Ghiggino

      Article first published online: 13 JAN 2015 | DOI: 10.1002/pola.27514

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      Rod–coil block copolymers comprising a conjugated polymer and functionalized C60 polymer components have been synthesized by a combination of condensation and controlled free radical polymerization methods and were found to impart improved operational stability to polymer solar cells when used as blend compatibilizers.

    6. Novel hyperbranched polymers synthesized via A3 + B(B′) approach by radical addition-coupling polymerization (pages 904–913)

      Yaobin Liu and Zhiqiang Fan

      Article first published online: 28 JAN 2015 | DOI: 10.1002/pola.27518

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      A novel application of radical addition-coupling polymerization (RACP) for synthesis of hyperbranched polymers is reported using Cu/PMDETA-mediated RACP of 2-methyl-2-nitrosopropane with trimethylolpropane tris(2-bromopropionate) or a bromo-ended 3-arm PS macromonomer, respectively. The mechanism includes formation of carbon radicals from bromide through single electron transfer, its capture by 2-methyl-2-nitrosopropane resulting in nitroxide radical, and cross-coupling reaction of the nitroxide radical with other carbon radicals. A hyperbranched polymer can be formed after multiple steps of such reactions.

    7. Branched poly(1,4-butylene carbonate-co-terephthalate)s: LDPE-like semicrystalline thermoplastics (pages 914–923)

      Seong Yeon Park, Jiseul Chun, Jong Yeob Jeon, Pyung Cheon Lee, Yongtaek Hwang, Bo Geun Song, Rafael Ramos, Chang Y. Ryu and Bun Yeoul Lee

      Article first published online: 1 FEB 2015 | DOI: 10.1002/pola.27519

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      The introduction of branched chain architecture in PBCT polymers offers a great technological advantage to reduce the synthesis time of polycondensation in bulk, while offering enhanced processibility and mechanical properties for applications. Upon incorporating aromatic terephthalate units at 45–50 mol % and small amounts of branch units (<0.5 mol %), a desirable melting temperature of about 120 °C can be achieved, along with a fast crystallization rate, without significantly altering the processing equipment already used in the polyolefin industry.

    8. Physicochemical characterization of the thermo-induced self-assembly of thermo-responsive PDMAEMA-b-PDEGMA copolymers (pages 924–935)

      Michael Wagner, Christian Pietsch, Andreas Kerth, Anja Traeger and Ulrich S. Schubert

      Article first published online: 1 FEB 2015 | DOI: 10.1002/pola.27520

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      Block copolymers of PDMAEMA-b-PDEGMA are able to undergo thermo-induced self-assembly based on their LCST behavior. By a combination of light scattering, field flow fractionation, and differential scanning calorimetry up to two structural transitions could be identified in dependence on the block ratio. Adjusting solution parameters like ionic strength or pH value enabled exact control of the cloud point over a wide temperature range and the application as soluble polymeric sensors for pH value, temperature, and salt concentration.

    9. Fabrication of fluorescent holographic micropatterns based on the rare earth complexes using azobenzene-containing poly(aryl ether)s as macromolecular ligands (pages 936–943)

      Yuxuan Zhang, Jingjing Zhang, Zengduo Cui, Qidai Chen, Haibo Zhang and Zhenhua Jiang

      Article first published online: 3 FEB 2015 | DOI: 10.1002/pola.27521

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      On the basis of photoinduced surface relief gratings (SRGs) with the rare earth complexes using poly(aryl ether)s as macromolecular ligands, a series of novel materials for fabricating rewritable fluorescent two-dimensional micropatterns are demonstrated. The influence of the contents of azobenzene chromophores on the fluorescent intensity is also investigated. After being exposed to an interference pattern created by laser beam, the films of the rare earth complexes form SRGs rapidly, which could emit fluorescence under the excitation.

    10. Synthesis and characterization of high refractive index polyimides derived from 2,5-Bis(4-Aminophenylenesulfanyl)-3,4-Ethylenedithiothiophene and aromatic dianhydrides (pages 944–950)

      Hyeonuk Yeo, Jiye Lee, Munju Goh, Bon-Cheol Ku, Honglae Sohn, Mitsuru Ueda and Nam-Ho You

      Article first published online: 19 FEB 2015 | DOI: 10.1002/pola.27547

      Thumbnail image of graphical abstract

      This paper presents the synthesis and characterization of a polyimide (PI) series containing a 2,5-bis(4-aminophenylenesulfanyl)-3,4-ethylenedithiothiophene (APSEDTT) unit in polymer main chain. The APSEDTT monomer with high sulfur content was synthesized and polymerized with several aromatic dianhydrides, such as 4,4′-[p-thiobis(phenylenesulfanyl)]diphthalic anhydride (3SDEA). All PIs exhibited high transparency and good thermal properties. In addition, the PIs have excellent optical properties in refractive index and birefringence. In particular, APSEDTT-3SDEA showed a high refractive index (1.7586), and a low birefringence (0.0087).

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