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359 Aktuelle Fachpublikationen zum Thema temperature

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ROMP synthesis of novel thermo‐, pH‐, and salt‐responsive (co)polymers containing the morpholino functional group

21.10.2014 | Johannes A. Hensbergen, Sylvia Ganda, Peter J. Roth, Robert P. Burford, Andrew B. Lowe, Journal of Polymer Science Part A: Polymer Chemistry, 2014

ABSTRACT We report the ring‐opening metathesis polymerization (ROMP) synthesis of novel (co)polymers containing the multiresponsive morpholino functional group [(3aR,7aS)−2‐(2‐morpholinoethyl)−3a,4,7,7a‐tetrahydro‐1H−4,7‐epoxyisoindole‐1,3(2H)‐dione (M1)]. All (co)polymers were prepared with ...

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Using controlled radical polymerization to confirm the lower critical solution temperature of an N‐(alkoxyalkyl) acrylamide polymer in aqueous solution

21.10.2014 | Xeniya Savelyeva, Lucia Li, Milan Marić, Journal of Polymer Science Part A: Polymer Chemistry, 2014

ABSTRACT N‐(3‐Methoxypropyl) acrylamide (MPAM) was polymerized by controlled radical polymerization (CRP) methods such as nitroxide‐mediated polymerization (NMP) and reversible addition–fragmentation chain‐transfer polymerization (RAFT). CRP was expected to yield well‐defined polymers with ...

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Dynamic covalent polypeptides showing tunable secondary structures and thermoresponsiveness

20.10.2014 | Jiatao Yan, Kun Liu, Xiuqiang Zhang, Wen Li, Afang Zhang, Journal of Polymer Science Part A: Polymer Chemistry, 2014

ABSTRACT Lysine‐based polypeptides can be afforded with steerable secondary structures and tunable thermoresponsiveness through dynamic covalent OEGylation. These polypeptides were formed through dynamic imine linkage via reactions of amino moieties from poly(l‐lysine)s with aldehydes from ...

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Effect of N‐methyl amide linkage on hydrogen bonding behavior and water transport properties of partially N‐methylated random aromatic copolyamides

03.10.2014 | Motohiro Aiba, Takahiro Tokuyama, Hidetoshi Matsumoto, Hiroki Tomioka, Tomoya Higashihara, Mitsuru Ueda, Journal of Polymer Science Part A: Polymer Chemistry, 2014

ABSTRACT The synthesis, conformational preferences, hydrogen bonding behaviors, and membrane properties of new partially N‐methylated random aromatic copolyamides were reported. These copolyamides were prepared by the low temperature polycondensations of isophthaloyl chloride with ...

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Poly(ionic liquid)s derived from 3‐octyl‐1‐vinylimidazolium bromide and N‐isopropylacrylamide with tunable properties

03.10.2014 | Javier Illescas, Mariano Casu, Valeria Alzari, Daniele Nuvoli, Mariano Andrea Scorciapino, Roberta Sanna, Vanna Sann ..., Journal of Polymer Science Part A: Polymer Chemistry, 2014

ABSTRACT A new series of linear and crosslinked copolymers, obtained from 3‐octyl‐1‐vinylimidazolium bromide (VImBr) and N‐isopropylacrylamide (NIPAAm), were prepared by radical polymerization. Namely, VImBr was synthesized from 1‐bromooctane and an ionic liquid such as 1‐vinylimidazole. ...

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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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