Relaxation Dynamics and Underlying Mechanism of a Thermally Reversible Gel from Symmetric Triblock Copolymer

Ye, Ya Nan; Cui, Kunpeng; Indei, Tsutomu; Nakajima, Tasuku; Hourdet, Dominique; Kurokawa, Takayuki; Gong, Jian Ping

Relaxation Dynamics and Underlying Mechanism of a Thermally Reversible Gel from Symmetric Triblock Copolymer

Ye, Ya Nan; Cui, Kunpeng; Indei, Tsutomu et al.

Macromolecules, 2019, 52(22), 8651-8661

Permalink : https://hdl.handle.net/2115/79694

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アクセス権	open access
URI	https://hdl.handle.net/2115/79694
タイトル	Relaxation Dynamics and Underlying Mechanism of a Thermally Reversible Gel from Symmetric Triblock Copolymer
著者	Ye, Ya Nan ; Cui, Kunpeng ; Indei, Tsutomu ; Nakajima, Tasuku ; Hourdet, Dominique ; Kurokawa, Takayuki ; Gong, Jian Ping
著者名 Ye, Ya Nan
著者名 Cui, Kunpeng
著者名 Indei, Tsutomu
著者名 Nakajima, Tasuku
著者名 Hourdet, Dominique
著者名 Kurokawa, Takayuki
e-Rad_Researcher 20250417 著者名 Gong, Jian Ping
言語	英語
発行日	2019-11-26
出版者	American Chemical Society
収録物名	Macromolecules
巻(号)	52(22)
ページ	8651-8661
抄録	We report a novel thermally responsive system from poly(butyl methacrylate)-b-poly(methacrylic acid)-b-poly(butyl methacrylate) (PBMA-b-PMAA-b-PBMA) triblock copolymer in dimethylformamide (DMF) solvent. This system shows a sol–gel transition by cooling below a critical temperature Tc. The network relaxation times of these gels rightly fall in the typical rheological experiment window, permitting us to investigate the relaxation dynamics and underlying mechanism, with a combination of linear rheology, time-resolved small-angle X-ray scattering (SAXS), and temperature-elevated nuclear magnetic resonance (NMR) measurements. Both time–temperature superposition (TTS) and time–concentration superposition (TCS) are well held in this system. The relaxation dynamics at temperatures below and above Tc are quite different, giving two different activation energies E1a and E2a, respectively. The E1a, being polymer concentration independent, is related to micelle formation of end-blocks, while the concentration dependent E2a is related to the chain friction of entangled polymer solution. By coupling linear rheology, SAXS, and NMR, we quantitatively estimated the fraction of bridge, loop, and dangling chains. The longest relaxation time of the gel, τL, strongly depends on polymer concentration, which is attributed to the increased connectivity of the micellar network. By combining the shift factors aT and aC determined from TTS and TCS, respectively, we can obtain the τL at any given temperature and concentration from that at reference temperature and concentration.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	This document is the Accepted Manuscript version of a Published Work that appeared in final form in Macromolecules, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.macromol.9b01856.
PISSN	0024-9297
EISSN	1520-5835
NCID	AA0071963X
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1021/acs.macromol.9b01856