Journal of Polymer Science Part A: Polymer Chemistry

Cover image for Vol. 52 Issue 17

1 September 2014

Volume 52, Issue 17

Pages i–iv, 2395–2555

  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 52, Issue 17 (pages i–ii)

      Article first published online: 25 JUL 2014 | DOI: 10.1002/pola.27325

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      Polyester-based dendrimers of generation 1 to 4 functionalized with allyl or propargyl groups were prepared and reacted with an anomeric sugar thiol exploiting the photoinduced radical thiol-ene coupling. Mattia Ghirardello, Kim Öberg, Samuele Staderini, Olivier Renaudet, Nathalie Berthet, Pascal Dumy, Yvonne Hed, Alberto Marra, Michael Malkoch, and Alessandro Dondoni report on page 2422 (DOI: 10.1002/pola.27262) that the obtained glycodendrimers, bearing from 6–96 N-acetyl-glucosamine units, are excellent ligands for wheat germ agglutinin (WGA), a lectin from Triticum vulgaris that is specific for this sugar. The painting shown is Vincent van Gogh's Wheat Field with Reaper and Sun.

    2. You have free access to this content
      Cover Image, Volume 52, Issue 17 (pages iii–iv)

      Article first published online: 25 JUL 2014 | DOI: 10.1002/pola.27326

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      On page 2399 (DOI: 10.1002/pola.27269), Anna Mielańczyk and Dorota Neugebauer report the synthesis of star-shaped copolymers of tert-butyl methacrylate (tBMA) and methyl methacrylate with a variable number of arms (4 vs. 6) using ATRP salicine-based initiators. The degree of polymerization of the arms (DParm = 13–79) and the composition (25–75 mol% of tBMA) are also reported. tert-Butyl groups are removed by acidolysis to form hydrophilic acidic groups (13–75 mol%), which are further labeled with fluorescein amine (FA). The SEM image represents the morphology of FA labeled 6-armed polyelectrolyte, which was dried under reduced pressure at room temperature.

  2. Rapid Communication

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    2. Cover Image
    3. Rapid Communication
    4. Articles
    1. Polymerization of isoprene catalyzed by 2-(methyl-2-benzimidazolyl)-6-(1-(arylimino) ethyl) pyridine iron(III) trichloride with an additional donor (pages 2395–2398)

      Xiubo Jiang, Xinglong Wen, Wen-Hua Sun and Aihua He

      Article first published online: 20 JUN 2014 | DOI: 10.1002/pola.27267

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      A special external component (triphenyl phosphate), which was introduced into the iron(III) complexes system was studied. Some of the greatly affected parameters include the catalytic activity, stereospecificity (obvious increases of 3,4 content), polymer molecular weight, and molecular weight distribution.

  3. Articles

    1. Top of page
    2. Cover Image
    3. Rapid Communication
    4. Articles
    1. Synthesis and characterization of D-(−)-Salicine-based star copolymers containing pendant carboxyl groups with fluorophore dyes (pages 2399–2411)

      Anna Mielańczyk and Dorota Neugebauer

      Article first published online: 16 JUN 2014 | DOI: 10.1002/pola.27269

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      Mono- and diacetal derivatives of D-(−)-salicin, bearing bromoester groups, were used to synthesize 4- and 6-arm star copolymers of varying polymerization degree and content of tert-butyl methacrylate units. After acidolysis of tert-butyl groups, amphiphilic copolymers with randomly distributed acidic groups in arm chains were obtained. Response of weak polyacids to pH within the range from 6 to 9 was examined. Water soluble star copolymers were chemically tagged with fluorescein amine to introduce fluorophore moieties into the arms.

    2. Spotlight Article

      Rigid chain ribbon-like metallopolymers (pages 2412–2421)

      Antonio Carella, Fabio Borbone, Giuseppina Roviello, Ugo Caruso, Claudio Ferone, Laura Ricciotti, Beniamino Pirozzi, Paola Persico, Alberto Giacometti Schieroni and Antonio Roviello

      Article first published online: 6 JUN 2014 | DOI: 10.1002/pola.27255

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      A set of new metallopolymers in which the repeating units are connected to each other through Cu(II) metal centers is reported. The coordination link is based on the bis-chelating properties of two different monomers, which afford, upon coordination to the metal, flexible and rigid repeating units. XRD, DSC, and UV–Vis analysis suggest a partial block character in copolymer constitution, which determines, in rigid units rich copolymers, a highly planar ribbon-like crystalline packing.

    3. Thiol-ene and thiol-yne-based synthesis of glycodendrimers as nanomolar inhibitors of wheat germ agglutinin (pages 2422–2433)

      Mattia Ghirardello, Kim Öberg, Samuele Staderini, Olivier Renaudet, Nathalie Berthet, Pascal Dumy, Yvonne Hed, Alberto Marra, Michael Malkoch and Alessandro Dondoni

      Article first published online: 16 JUN 2014 | DOI: 10.1002/pola.27262

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      A collection of eight glycodendrimers with glycan densities ranging from 6–96 N-acetyl-glucosamine (GlcNAc) units per dendrimer was prepared by photoinduced thiol-ene and thiol-yne couplings. Inhibition experiments toward the plant lectin WGA revealed IC50 values in the nanomolar range and binding enhancements up to 6 orders of magnitude over the GlcNAc monosaccharide.

    4. Spotlight Article

      Thermal gelation or gel melting: (ethylene glycol)113-(l-alanine)12 and (ethylene glycol)113-(l-lactic acid)12 (pages 2434–2441)

      Seon Jung Jung, Min Hee Park, Hyo Jung Moon, Du Young Ko and Byeongmoon Jeong

      Article first published online: 28 MAY 2014 | DOI: 10.1002/pola.27254

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      Poly(ethylene glycol)-poly(L-alanine) (EG113-A12) aqueous solutions in a concentration range of 3.0–8.0 wt.% undergo sol-to-gel (thermal gelation), whereas poly(ethylene glycol)-poly(L-lactic acid) (EG113-LA12) aqueous solutions in a concentration range of 30.0–50.0 wt.% undergo gel-to-sol (gel melting) as the temperature increases from 5 to 60 ° C. The differences in nanoassemblies and core rigidity of micelles coming from an alpha-helical structure play a role in directing the sol-to-gel or gel-to-sol transition.

    5. Effects of graft length and density of well-defined graft polymers on the thermoresponsive behavior and self-assembly morphology (pages 2442–2453)

      Bingyan Jiang, Lei Zhang, Jie Yan, Qingquan Huang, Bing Liao and Hao Pang

      Article first published online: 2 JUN 2014 | DOI: 10.1002/pola.27256

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      Effects of grafting length and density for a series of well-defined graft polymers on thermoresponsive behavior, aggregating mean diameter, and self-assembly morphology are systematically investigated. The changes of grafting length and density have positive co-relationship with LCST change, diameter of micelles, and the size distribution. TEM observation indicates that the graft length and density on the side chain have more significant effect on the diameter than self-assemble morphology, which meets the characteristic of star-like micelle.

    6. Pyromellitic diimide-based copolymers for ambipolar field-effect transistors: Synthesis, characterization, and device applications (pages 2454–2464)

      Jinjun Shao, Jingjing Chang, Gaole Dai and Chunyan Chi

      Article first published online: 16 JUN 2014 | DOI: 10.1002/pola.27259

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      Three pyromellitic diimide-based copolymers were synthesized. They have good solubility in common organic solvents and exhibit a good thermal stability. The field-effect transistors based on these polymers were fabricated by solution-processing techniques and ambipolar behavior was observed.

    7. Synthesis, characterization, and organic field-effect transistors study of conjugated D–A copolymers based on dialkylated naphtho[1,2-b:5,6-b′]dithiophene/naphtho[1,2-b:5,6-b′]difuran and benzodiathiazole/benzoxadiazole (pages 2465–2476)

      Shaowei Shi, Keli Shi, Song Chen, Rui Qu, Liwei Wang, Meng Wang, Gui Yu, Xiaoyu Li and Haiqiao Wang

      Article first published online: 18 JUN 2014 | DOI: 10.1002/pola.27260

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      Four donor–acceptor copolymers, P(NDT3-BT), P(NDT3-BO), P(NDF3-BT) and P(NDF3-BO), using 5,10-didodecyl-naphtho[1,2-b:5,6-b′]dithiophene (NDT3) or 5,10-didodecyl-naphtho[1,2-b:5,6-b′]difuran (NDF3) as an electron-rich unit and benzodiathiazole or benzoxadiazole as an electron-deficient one, were designed, synthesized, and characterized. A detailed systematic investigation was developed for studying the effect of the S/O atoms on the optical, electrochemical, and morphological properties of the polymers, as well as the subsequent performance of the organic field-effect transistors fabricated from these copolymers.

    8. Monomer sequencing and microstructural analysis on polymers of dimethyl norbornene dicarboxylate and 7-oxanorbornene dicarboxylic derivatives employing ruthenium catalysts by ring-opening metathesis polymerization (pages 2477–2501)

      Michael A. Tallon, Yulia Rogan, Bilal Marie, Raymond Clark, Osama M. Musa and Ezat Khosravi

      Article first published online: 19 JUN 2014 | DOI: 10.1002/pola.27261

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      Homo/copolymers based on 5,6-substituted norbornene and 7-oxanorbornene-type monomers by ring-opening metathesis polymerization are reported and correlated to their primary and secondary structural elements. In general, a first-generation Grubbs-I ruthenium catalyst generates polymers with high trans content that exhibits an extended serpentine secondary structure with exo,exo substituents. In contrast, a second-generation Grubbs-II catalyst produces polymers with higher cis content that forms tight turns, resulting in a compact globular structure.

    9. One pot synthesis and gelation studies of amphiphilic triblock polyurethanes (pages 2502–2508)

      Tathagata Mondal and Suhrit Ghosh

      Article first published online: 19 JUN 2014 | DOI: 10.1002/pola.27263

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      Step-growth polymerization of a di-ol and di-isocyanate in the presence of a polymeric mono-functional impurity (PEG-OH) produces a series of amphiphilic triblock polyurethanes (PU) with varying PU/PEG segments. These series self-assemble in polar organic solvents by inter-chain H-bonding among the urethane groups and produce a transparent gel. Structure–property relationship studies show the importance of a right proportion of the PU and PEG blocks for effective gelation.

    10. ɛ-caprolactone and lactide polymerization promoted by an ionic titanium(IV)/iron(III) polynuclear halo-alkoxide (pages 2509–2517)

      Cristiano Egevardt, Siddhartha O. K. Giese, Alan D. da C. Santos, Andersson Barison, Eduardo L. de Sá, Arion Zandoná Filho, Thiago A. da Silva, Sônia F. Zawadzki, Jaísa F. Soares and Giovana G. Nunes

      Article first published online: 18 JUN 2014 | DOI: 10.1002/pola.27264

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      The ionic [Ti33-OPri)22-OPri)3(OPri)6][FeCl4], complex A, promotes the high yield polymerization of lactides and ε-caprolactone in bulk. The cationic {Ti3(OR)11}+ framework presents itself as a promising structural pattern in the ring-opening polymerization of esters.

    11. Ring opening polymerization of epoxides with urea-derivatives of 4-aminopyridine as thermally latent anionic initiator (pages 2518–2522)

      Naoyuki Makiuchi, Atsushi Sudo and Takeshi Endo

      Article first published online: 13 JUN 2014 | DOI: 10.1002/pola.27265

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      A series of urea-derivatives of 4-aminopyridine were used as thermally latent initiators for the ring-opening polymerization of epoxides. It was implied that the urea-derivatives mixed with diglycidyl ether of bisphenol A (DGEBA) underwent the thermal dissociation above the specific threshold temperatures, and the 4-aminopyridine released from the urea-derivatives initiated the ring-opening polymerization of DGEBA.

    12. Promoting effect of thiophenols on the ring-opening polymerization of 1,3-benzoxazine (pages 2523–2527)

      Asei William Kawaguchi, Atsushi Sudo and Takeshi Endo

      Article first published online: 16 JUN 2014 | DOI: 10.1002/pola.27266

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      The remarkable acceleration effects of thiophenols on the thermally induced polymerization of benzoxazine are reported.

    13. Radical polymerization of 2,5-norbornadienes containing ester groups by AIBN and oxygen gas (pages 2528–2536)

      Masashi Shiotsuki, Hironobu Kai and Takeshi Endo

      Article first published online: 16 JUN 2014 | DOI: 10.1002/pola.27268

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      Polymerization behaviors of new 2,5-norbornadiene (NBD)-type monomers bearing 1-adamantyl and cyclohexyl ester groups were studied. The polymerization can be initiated by a free-radical initiator or O2 gas. Changing the ratio of provided O2 gas to NBD ethyl ester significantly affected the polymerization results—specifically changing the molecular weight of the formed polymer. The combination of NBD ethyl ester with O2 was applicable as a new free-radical initiator for polymerization of methyl methacrylate.

    14. Microstructure of metallocene isotactic propylene-co-1-pentene-co-1-hexene terpolymers (pages 2537–2547)

      Alberto García-Peñas, José M. Gómez-Elvira, Ernesto Pérez and María L. Cerrada

      Article first published online: 16 JUN 2014 | DOI: 10.1002/pola.27270

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      Isotactic propylene-co-1-pentene-co-1-hexene terpolymers are prepared through metallocene catalysis with up to 14 molar % of total comonomer content. A thorough 13C NMR analysis of the microstructure evidences the random distribution of both comonomers into the chains, and allows the assertion that there is no preference of the catalyst for any of the α-olefins. These terpolymers are then well-defined models for studying the combined influence of 1-pentene and 1-hexene on its peculiar semicrystalline morphology.

    15. Spotlight Article

      Synthesis of triblock and multiblock methacrylate polymers and self-assembly of stimuli responsive triblock polymers (pages 2548–2555)

      Stacey M. Chin, Hongkun He, Dominik Konkolewicz and Krzysztof Matyjaszewski

      Article first published online: 16 JUN 2014 | DOI: 10.1002/pola.27271

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      A versatile synthesis of multisegmented methacrylate block copolymers is developed. Polymers containing three blocks as well as seven distinct blocks are synthesized. The polymers have a well-defined structure, with narrow molecular weight distributions. The triblock copolymers have both temperature and pH responsive segments and the self-assembly of these stimuli responsive block copolymers is studied.

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