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Precise Synthesis and Thermoresponsive Property of Poly(ethyl glycidyl ether) and Its Block and Statistic Copolymers with Poly(glycidol)

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Title: Precise Synthesis and Thermoresponsive Property of Poly(ethyl glycidyl ether) and Its Block and Statistic Copolymers with Poly(glycidol)
Authors: He, Tingyu Browse this author
Wang, Yanqiu Browse this author
Narumi, Atsushi Browse this author
Xu, Liang Browse this author
Sato, Shin-ichiro Browse this author →KAKEN DB
Shen, Xiande Browse this author
Kakuchi, Toyoji Browse this author →KAKEN DB
Keywords: statistic copolymers
block copolymers
thermoresponsive polymers
Issue Date: Nov-2021
Publisher: MDPI
Journal Title: Polymers
Volume: 13
Issue: 22
Start Page: 3873
Publisher DOI: 10.3390/polym13223873
Abstract: In this paper, we describe a comprehensive study of the thermoresponsive properties of statistic copolymers and multiblock copolymers synthesized by poly(glycidol)s (PG) and poly(ethyl glycidyl ether) (PEGE) with different copolymerization methods. These copolymers were first synthesized by ring-opening polymerization (ROP), which was initiated by tert-butylbenzyl alcohol (tBBA) and 1-tert-butyl-4,4,4-tris(dimethylamino)-2,2-bis[tris(dimethylamino)phosphoranylidenamino]-2 lambda(5),4 lambda(5)-catenadi(phosphazene) (t-Bu-P-4) as the catalyst, and then the inherent protective groups were removed to obtain the copolymers without any specific chain end groups. The thermoresponsive property of the statistic copolymer PG(x)-stat-PEGE(y) was compared with the diblock copolymer PG(x)-b-PEGE(y), and the triblock copolymers were compared with the pentablock copolymers. Among them, PG-stat-PEGE, PG-b-PEGE-b-PG-b-PEGE-b-PG, and PEGE-b-PG-b-PEGE-b-PG-b-PEGE, and even the specific ratio of PEGE-b-PG-b-PEGE, exhibited LCST-type phase transitions in water, which were characterized by cloud point (T-cp). Although the ratio of x to y affected the value of the T-cp of PG(x)-stat-PEGE(y), we found that the disorder of the copolymer has a decisive effect on the phase-transition behavior. The phase-transition behaviors of PG-b-PEGE, part of PEGE-b-PG-b-PEGE, and PG-b-PEGE-b-PG copolymers in water present a two-stage phase transition, that is, firstly LCST-type and then the upper critical solution temperature (UCST)-like phase transition. In addition, we have extended the research on the thermoresponsive properties of EGE homopolymers without specific alpha-chain ends.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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