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Synthesis of dual thermoresponsive ABA triblock copolymers by both living cationic vinyl polymerization and RAFT polymerization using a dicarboxylic RAFT agent

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Main Authors: Sugihara, Shinji, Iwata, Keiji, Miura, Soichiro, Akmal Hadi, Ma'Radzi , Maeda, Yasushi
Other Authors: sugihara@u-fukui.ac.jp
Format: Article
Language:English
Published: Elsevier Ltd. 2014
Subjects:
Living cationic polymerization
Reversible addition fragmentation chain transfer (RAFT)
Triblock copolymer
Online Access:http://dspace.unimap.edu.my:80/dspace/handle/123456789/35579
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spelling my.unimap-355792014-06-16T09:26:15Z Synthesis of dual thermoresponsive ABA triblock copolymers by both living cationic vinyl polymerization and RAFT polymerization using a dicarboxylic RAFT agent Sugihara, Shinji Iwata, Keiji Miura, Soichiro Akmal Hadi, Ma'Radzi  Maeda, Yasushi sugihara@u-fukui.ac.jp akmalhadi@unimap.edu.my Living cationic polymerization Reversible addition fragmentation chain transfer (RAFT) Triblock copolymer Link to publisher's homepage at http://www.elsevier.com/ To elucidate a difference of micelles formed from AB di- and ABA tri-block copolymers, PMOVE-PNIPAM-PMOVE triblock copolymers were synthesized by both living cationic polymerization of MOVE and RAFT polymerization of NIPAM using a dicarboxylic RAFT agent, where MOVE is 2-methoxyethyl vinyl ether, NIPAM is N-isopropylacrylamide. The ABA triblock copolymers consist of cationically polymerizable monomer (A), MOVE, and radically polymerizable monomer (B), NIPAM. The key to success in the triblock copolymerization is to utilize a dicarboxylic RAFT agent/SnBr4 initiation system for living cationic polymerization. The cationic polymerization was simultaneously initiated from two protons per one dicarboxylic RAFT agent. After the cationic polymerization, the polymerization was quenched and then the RAFT carboxylate counter anion was concurrently recovered at ca. 86% efficiency, followed by the RAFT polymerization. The resulting PMOVE-PNIPAM-PMOVE triblock copolymers contain two thermoresponsive blocks. The resulting block copolymers reversibly formed or deformed micellar assemblies in water. When the chain length of the core-forming block, PNIPAM, is increased, larger micelles were invariably obtained. The triblock micellar size was larger than that of the corresponding diblock micelle. The micelles at the concentrated solution formed physical gel, and the minimum gelation concentration of the triblock micelles was lower than that of the corresponding diblock micelles. 2014-06-16T09:26:15Z 2014-06-16T09:26:15Z 2013-02 Article Polymer (United Kingdom), vol. 54(3), 2013, pages 1043-1052 0032-3861 http://www.sciencedirect.com/science/article/pii/S0032386112010993 http://dspace.unimap.edu.my:80/dspace/handle/123456789/35579 en Elsevier Ltd.
institution Universiti Malaysia Perlis
building UniMAP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Perlis
content_source UniMAP Library Digital Repository
url_provider http://dspace.unimap.edu.my/
language English
topic Living cationic polymerization
Reversible addition fragmentation chain transfer (RAFT)
Triblock copolymer
spellingShingle Living cationic polymerization
Reversible addition fragmentation chain transfer (RAFT)
Triblock copolymer
Sugihara, Shinji
Iwata, Keiji
Miura, Soichiro
Akmal Hadi, Ma'Radzi 
Maeda, Yasushi
Synthesis of dual thermoresponsive ABA triblock copolymers by both living cationic vinyl polymerization and RAFT polymerization using a dicarboxylic RAFT agent
description Link to publisher's homepage at http://www.elsevier.com/
author2 sugihara@u-fukui.ac.jp
author_facet sugihara@u-fukui.ac.jp
Sugihara, Shinji
Iwata, Keiji
Miura, Soichiro
Akmal Hadi, Ma'Radzi 
Maeda, Yasushi
format Article
author Sugihara, Shinji
Iwata, Keiji
Miura, Soichiro
Akmal Hadi, Ma'Radzi 
Maeda, Yasushi
author_sort Sugihara, Shinji
title Synthesis of dual thermoresponsive ABA triblock copolymers by both living cationic vinyl polymerization and RAFT polymerization using a dicarboxylic RAFT agent
title_short Synthesis of dual thermoresponsive ABA triblock copolymers by both living cationic vinyl polymerization and RAFT polymerization using a dicarboxylic RAFT agent
title_full Synthesis of dual thermoresponsive ABA triblock copolymers by both living cationic vinyl polymerization and RAFT polymerization using a dicarboxylic RAFT agent
title_fullStr Synthesis of dual thermoresponsive ABA triblock copolymers by both living cationic vinyl polymerization and RAFT polymerization using a dicarboxylic RAFT agent
title_full_unstemmed Synthesis of dual thermoresponsive ABA triblock copolymers by both living cationic vinyl polymerization and RAFT polymerization using a dicarboxylic RAFT agent
title_sort synthesis of dual thermoresponsive aba triblock copolymers by both living cationic vinyl polymerization and raft polymerization using a dicarboxylic raft agent
publisher Elsevier Ltd.
publishDate 2014
url http://dspace.unimap.edu.my:80/dspace/handle/123456789/35579
_version_ 1643797842668552192
score 13.214268

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