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354 Aktuelle Fachpublikationen zum Thema temperature

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Living cationic polymerization of vinylnaphthalene derivatives

02.09.2013 | Yu Shinke, Arihiro Kanazawa, Shokyoku Kanaoka, Sadahito Aoshima, Journal of Polymer Science Part A: Polymer Chemistry, 2013

ABSTRACT The living cationic polymerization of 6‐tert‐butoxy‐2‐vinylnaphthalene (tBOVN), a vinylnaphthalene derivative with an electron‐donating group, was achieved with a TiCl4/SnCl4 combined initiating system in the presence of ethyl acetate as an added base at –30 °C. The absence of side ...

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ATNRC/SET‐NRC synthesis of graphene/polyisobutylene nanocomposites

28.08.2013 | Zhanzhan Liu, Yongjun Li, Yang Yang, Yongsheng Li, Xiaoyu Huang, Journal of Polymer Science Part A: Polymer Chemistry, 2013

ABSTRACT Two polyisobutylene‐grafted graphene nanocomposites were prepared by CuBr‐catalyzed atom transfer nitroxide radical coupling (ATNRC) and Cu‐catalyzed single electron transfer‐nitroxide radical coupling (SET‐NRC) chemistry under mild conditions, respectively, through the grafting‐onto ...

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Fluorescent, thermoresponsive copolymers via nitroxide‐mediated polymerization: Synthesis and effect of fluorescent groups on phase transitions in an ionic liquid

26.08.2013 | Chi Zhang, Milan Maric, Journal of Polymer Science Part A: Polymer Chemistry, 2013

ABSTRACT Synthesis of poly(benzyl methacrylate) (PBzMA) by nitroxide‐mediated polymerization with a small fraction of fluorescent, controlling comonomer, 9‐(4‐vinylbenzyl)‐9H‐carbazole (VBK, 2–11 mol % in the feed), was studied along with the resulting copolymers' LCST phase behavior in the ...

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Photo‐triggered redox frontal polymerization: A new tool for synthesizing thermally sensitive materials

26.08.2013 | Minghui He, Xun Huang, Zhaohua Zeng, Jianwen Yang, Journal of Polymer Science Part A: Polymer Chemistry, 2013

ABSTRACT A novel approach of photo‐triggered redox frontal polymerization (FP) by integrating photocaged superbase (QA‐DBU) with a peroxide initiator (dibenzoyl peroxide, BPO) is presented for the synthesis of thermally sensitive materials. Under photo‐irradiation at a localized region, the ...

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V‐shaped graft copolymers via triple click reactions: Diels–alder, copper‐catalyzed azide–alkyne cycloaddition, and nitroxide radical coupling

21.08.2013 | Ufuk Saim Gunay, Bengu Ozsoy, Hakan Durmaz, Gurkan Hizal, Umit Tunca, Journal of Polymer Science Part A: Polymer Chemistry, 2013

ABSTRACT We report here a simple and universal synthetic pathway covering triple click reactions, Diels–Alder, copper‐catalyzed azide–alkyne cycloaddition (CuAAC), and nitroxide radical coupling (NRC), to prepare well‐defined graft copolymers with V‐shaped side chains. The Diels–Alder click ...

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Photoresponsive polyamides containing pentamethylated norbornadiene moieties: Synthesis and photochemical properties under sunlight irradiation

13.08.2013 | Ahmed Oueslati, Imen Abdelhedi, Régis Mercier, Eric Drockenmuller, Hatem Ben Romdhane, Journal of Polymer Science Part A: Polymer Chemistry, 2013

ABSTRACT Photoresponsive polyamides containing main‐chain pentamethylated norbornadiene (NBD) moieties are obtained in quantitative yields via the Yamazaki–Higashi reaction between a pentamethylated NBD dicarboxylic acid and a series of aromatic diamines. Chemical structures are confirmed by ...

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Comparison of the growth and degradation of poly(glycolic acid) and poly(ε‐caprolactone) brushes

10.08.2013 | Xinfang Hu, Gongfang Hu, Kaitlyn Crawford, Christopher B. Gorman, Journal of Polymer Science Part A: Polymer Chemistry, 2013

ABSTRACT The growth and degradation of poly(glycolic acid) (PGA) and poly(ε‐caprolactone) (PCL) brushes were compared. Using tin (octanoate) as the catalyst, optimal conditions were found for growth of each polyester brush from the hydroxy‐terminated silicon surface via ring‐opening ...

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Poly(ionic liquid)s based on imidazolium hydrogen carbonate monomer units as recyclable polymer‐supported N‐heterocyclic carbenes: Use in organocatalysis

31.07.2013 | Paul Coupillaud, Julien Pinaud, Nicolas Guidolin, Joan Vignolle, Maréva Fèvre, Ellen Veaudecrenne, David Mecerreyes, ..., Journal of Polymer Science Part A: Polymer Chemistry, 2013

ABSTRACT Synthesis of novel poly(ionic liquid)s, namely, poly(1‐vinyl‐3‐alkylimidazolium hydrogen carbonate)s, denoted as poly([NHC(H)][HCO3])s or PVRImHCO3, where R is an alkyl group (R = ethyl, butyl, phenylethyl, dodecyl), is described. Two distinct synthetic routes were explored. The first ...

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Fluorescence emission of amphiphilic copolymers bearing benzimidazole groups: Stimuli‐responsive behaviors in aqueous solution

23.07.2013 | Bing Han, Nianchen Zhou, Wei Zhang, Zhenping Cheng, Jian Zhu, Xiulin Zhu, Journal of Polymer Science Part A: Polymer Chemistry, 2013

ABSTRACT A stimuli‐responsive amphiphilic copolymer poly(NIPAMm‐b‐VBNBIn), including N‐isopropylacrylamide (NIPAM) as a thermoresponsive unit and 1‐(4‐vinyl benzyl)‐2‐naphthyl‐benzimidazole (VBNBI) as a sensitive fluorophore unit, was designed and synthesized by reversible ...

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Thermosensitive t‐PLA‐b‐PNIPAAm tri‐armed star block copolymer nanoscale micelles for camptothecin drug release

22.07.2013 | Feng Xu, Shu‐Zhen Zheng, Yan‐Ling Luo, Journal of Polymer Science Part A: Polymer Chemistry, 2013

ABSTRACT Thermosensitive polylactide‐block‐poly(N‐isopropylacrylamide) (t‐PLA‐b‐PNIPAAm) tri‐armed star block copolymers were synthesized by atom transfer radical polymerization (ATRP) of monomer NIPAAm using t‐PLA‐Cl as macroinitiator. The synthesis of t‐PLA‐Cl was accomplished by ...

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