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

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-ope...

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Autores principales:	Tingyu He, Yanqiu Wang, Atsushi Narumi, Liang Xu, Shin-ichiro Sato, Xiande Shen, Toyoji Kakuchi
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	statistic copolymers block copolymers thermoresponsive polymers LCST Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/7d62f6d6e5ca4b76b2f456d2c1abd504
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spelling	oai:doaj.org-article:7d62f6d6e5ca4b76b2f456d2c1abd5042021-11-25T18:47:49ZPrecise Synthesis and Thermoresponsive Property of Poly(ethyl glycidyl ether) and Its Block and Statistic Copolymers with Poly(glycidol)10.3390/polym132238732073-4360https://doaj.org/article/7d62f6d6e5ca4b76b2f456d2c1abd5042021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/22/3873https://doaj.org/toc/2073-4360In 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 <i>tert</i>-butylbenzyl alcohol (<i>t</i>BBA) and 1-<i>tert</i>-butyl-4,4,4-tris(dimethylamino)-2,2-bis[tris(dimethylamino)phosphoranylidenamino]-2Λ<sup>5</sup>,4Λ<sup>5</sup>-catenadi(phosphazene) (<i>t</i>-Bu-P<sub>4</sub>) 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<i><sub>x</sub>-stat-</i>PEGE<i><sub>y</sub></i> was compared with the diblock copolymer PG<i><sub>x</sub></i>-<i>b</i>-PEGE<i><sub>y</sub></i>, and the triblock copolymers were compared with the pentablock copolymers. Among them, PG<i>-stat-</i>PEGE, PG-<i>b</i>-PEGE-<i>b</i>-PG<i>-b-</i>PEGE-<i>b</i>-PG, and PEGE-<i>b</i>-PG-<i>b</i>-PEGE-<i>b</i>-PG-<i>b</i>-PEGE, and even the specific ratio of PEGE-<i>b</i>-PG-<i>b</i>-PEGE, exhibited LCST-type phase transitions in water, which were characterized by cloud point (<i>T</i><sub>cp</sub>). Although the ratio of x to y affected the value of the <i>T</i><sub>cp</sub> of PG<sub>x</sub>-<i>stat</i>-PEGE<sub>y</sub>, we found that the disorder of the copolymer has a decisive effect on the phase-transition behavior. The phase-transition behaviors of PG-<i>b</i>-PEGE, part of PEGE-<i>b</i>-PG-<i>b</i>-PEGE, and PG-<i>b</i>-PEGE-<i>b</i>-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 α-chain ends.Tingyu HeYanqiu WangAtsushi NarumiLiang XuShin-ichiro SatoXiande ShenToyoji KakuchiMDPI AGarticlestatistic copolymersblock copolymersthermoresponsive polymersLCSTOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3873, p 3873 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	statistic copolymers block copolymers thermoresponsive polymers LCST Organic chemistry QD241-441
spellingShingle	statistic copolymers block copolymers thermoresponsive polymers LCST Organic chemistry QD241-441 Tingyu He Yanqiu Wang Atsushi Narumi Liang Xu Shin-ichiro Sato Xiande Shen Toyoji Kakuchi Precise Synthesis and Thermoresponsive Property of Poly(ethyl glycidyl ether) and Its Block and Statistic Copolymers with Poly(glycidol)
description	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 <i>tert</i>-butylbenzyl alcohol (<i>t</i>BBA) and 1-<i>tert</i>-butyl-4,4,4-tris(dimethylamino)-2,2-bis[tris(dimethylamino)phosphoranylidenamino]-2Λ<sup>5</sup>,4Λ<sup>5</sup>-catenadi(phosphazene) (<i>t</i>-Bu-P<sub>4</sub>) 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<i><sub>x</sub>-stat-</i>PEGE<i><sub>y</sub></i> was compared with the diblock copolymer PG<i><sub>x</sub></i>-<i>b</i>-PEGE<i><sub>y</sub></i>, and the triblock copolymers were compared with the pentablock copolymers. Among them, PG<i>-stat-</i>PEGE, PG-<i>b</i>-PEGE-<i>b</i>-PG<i>-b-</i>PEGE-<i>b</i>-PG, and PEGE-<i>b</i>-PG-<i>b</i>-PEGE-<i>b</i>-PG-<i>b</i>-PEGE, and even the specific ratio of PEGE-<i>b</i>-PG-<i>b</i>-PEGE, exhibited LCST-type phase transitions in water, which were characterized by cloud point (<i>T</i><sub>cp</sub>). Although the ratio of x to y affected the value of the <i>T</i><sub>cp</sub> of PG<sub>x</sub>-<i>stat</i>-PEGE<sub>y</sub>, we found that the disorder of the copolymer has a decisive effect on the phase-transition behavior. The phase-transition behaviors of PG-<i>b</i>-PEGE, part of PEGE-<i>b</i>-PG-<i>b</i>-PEGE, and PG-<i>b</i>-PEGE-<i>b</i>-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 α-chain ends.
format	article
author	Tingyu He Yanqiu Wang Atsushi Narumi Liang Xu Shin-ichiro Sato Xiande Shen Toyoji Kakuchi
author_facet	Tingyu He Yanqiu Wang Atsushi Narumi Liang Xu Shin-ichiro Sato Xiande Shen Toyoji Kakuchi
author_sort	Tingyu He
title	Precise Synthesis and Thermoresponsive Property of Poly(ethyl glycidyl ether) and Its Block and Statistic Copolymers with Poly(glycidol)
title_short	Precise Synthesis and Thermoresponsive Property of Poly(ethyl glycidyl ether) and Its Block and Statistic Copolymers with Poly(glycidol)
title_full	Precise Synthesis and Thermoresponsive Property of Poly(ethyl glycidyl ether) and Its Block and Statistic Copolymers with Poly(glycidol)
title_fullStr	Precise Synthesis and Thermoresponsive Property of Poly(ethyl glycidyl ether) and Its Block and Statistic Copolymers with Poly(glycidol)
title_full_unstemmed	Precise Synthesis and Thermoresponsive Property of Poly(ethyl glycidyl ether) and Its Block and Statistic Copolymers with Poly(glycidol)
title_sort	precise synthesis and thermoresponsive property of poly(ethyl glycidyl ether) and its block and statistic copolymers with poly(glycidol)
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/7d62f6d6e5ca4b76b2f456d2c1abd504
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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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