Helical phase driven by solvent evaporation in self-assembly of poly(4-vinylpyridine)-block -poly(l -lactide) chiral block copolymers

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Title:	Helical phase driven by solvent evaporation in self-assembly of poly(4-vinylpyridine)-block -poly(l -lactide) chiral block copolymers
Authors:	王孝方;Chung, Tsai-Ming;Wang, Hsiao-Fang;Lin, Tao;Chiang, Yeo-Wan;Chen, Yi-Chun;Ko, Bao-Tsan;Ho, Rong-Ming
Contributors:	工學院化學工程與材料工程學系
Keywords:	Applied sciences;composite polymers;evaporation rate;Exact sciences and technology;molecular weight;optical isomerism;Organic polymers;Physicochemistry of polymers;polymerization;Properties and characterization;Solution and gel properties;solvents
Date:	2012-12-21
Issue Date:	2026-04-21 14:05:02 (UTC+8)
Publisher:	American Chemical Society;Washington, DC: American Chemical Society
Abstract:	摘要： A series of chiral block copolymers (BCPs), poly(4-vinylpyridine)-block-poly(l-lactide) (P4VP–PLLA), are synthesized through atom transfer radical polymerization and living ring-opening polymerization. Except for typical microphase-separated phases, such as lamellae (L) and hexagonally packed cylinders (HC), a helical phase (H) with hexagonally packed PLLA helices in a P4VP matrix can be found in the self-assembly of P4VP–PLLA BCPs, reflecting the chirality effect on BCP self-assembly. The H formation is strongly dependent upon the solvent evaporation rate for solution casting at which fast evaporation gives the H* phase and slow evaporation results in the HC phase. To further examine the metastability of the H* phase associated with the dynamics of BCP* chains during self-assembly, P4VP–PLLA BCPs* having different molecular weights at a constant composition are utilized for self-assembly. Under the same evaporation rate for solution casting, the H* phase can be obtained in high-molecular-weight P4VP–PLLA BCP* whereas a stable HC phase is found in low-molecular-weight P4VP–PLLA BCP, indicating the kinetic origin of H formation due to the long and highly entangled chains in solution for self-assembly. Consequently, the H* phase can be driven by solvent evaporation through a kinetically trapped process and is regarded as a long-lived metastable phase. 其他題名： Macromolecules 出版者： Washington, DC: American Chemical Society 出版日期： 2012-12-21 出處： Macromolecules, 2012-12, Vol.45 (24), p.9727-9733 資源來源： American Chemical Society Journals 版權： Copyright © 2012 American Chemical Society 版權： 2014 INIST-CNRS 識別號： ISSN: 0024-9297 識別號： ISSN: 1520-5835 識別號： EISSN: 1520-5835 識別號： DOI: 10.1021/ma302159p 識別號： CODEN: MAMOBX
Appears in Collections:	[Department of Chemical and Materials Engineering] journal & Dissertation

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