Photoresponsive polymersomes formed by amphiphilic linear-dendritic block copolymers: Generation-dependent aggregation behavior

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Title:	Photoresponsive polymersomes formed by amphiphilic linear-dendritic block copolymers: Generation-dependent aggregation behavior
Authors:	曹恆光;Lin, Yung-Lung;Chang, Hung-Yu;Sheng, Yu-Jane;Tsao, Heng-Kwong
Contributors:	工學院化學工程與材料工程學系
Keywords:	Applied sciences;composite polymers;Exact sciences and technology;hydrophobicity;isomerization;micelles;molecular dynamics;nanofibers;nanosheets;Organic polymers;photosensitivity;Physicochemistry of polymers;prediction;Properties and characterization;Solution and gel properties;ultraviolet radiation
Date:	2012-09-11
Issue Date:	2026-04-21 13:59:10 (UTC+8)
Publisher:	American Chemical Society;Washington, DC: American Chemical Society
Abstract:	摘要： Azobenzene-containing linear–dendritic block copolymers (LDBC) with varied generation numbers were synthesized recently. This photosensitive LDBC consists of a linear solvophilic block (R) and solvophilic dendrons of which the periphery is attached with a solvophobic coil–rod diblock (B–Y). The self-assembly and its photoresponsive transformation are explored by dissipative particle dynamics. Dependent on the generation number, polymer concentration, block lengths, and π–π interaction between rod blocks, the aggregate exhibits a rich variety of morphological conformations, including spherical micelle, worm-like micelle, cylindrical micelle, hamburger-like micelle, nanosheet, nanobowl, and vesicle. In general, polymersomes take shape for LDBCs with large generation number while nanofibers and nanosheets develop for LDBCs with small generation number. Upon UV illumination, the photoinduced trans-to-cis isomerization of azobenzene takes place and the membrane becomes distorted, wrinkled, and even ruptured. A significant increase in water permeation through the polymersome membrane is also observed. These simulation findings are consistent with experimental observations. By varying polymer concentration and lengths of R- and B-blocks, morphological phase diagrams and internal structures of the resulting aggregates are obtained. Transformation from nanosheet or nanobowl to polymersome is observed as polymer concentration grows. When the R-block length decreases, the generation number at which polymersomes start to form declines. On the other hand, nanosheets tend to form for long R-block length. This prediction is also consistent with experimental observations. Polymersomes can also be formed for long enough B-block length at lower generation number. The membrane resistance to water permeation grows with increasing B-block length because of the increment of the hydrophobic layer thickness. Finally, as the π–π strength is increased, the overall morphologies vary from polymersome, nanobowl, to nanosheet. Therefore, polymersomes are formed only when the π–π strength is weak enough due to the hindrance associated with high degree of alignment among azo-rods. 其他題名： Macromolecules 出版者： Washington, DC: American Chemical Society 出版日期： 2012-09-11 出處： Macromolecules, 2012-09, Vol.45 (17), p.7143-7156 資源來源： American Chemical Society Journals 版權： Copyright © 2012 American Chemical Society 版權： 2015 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/ma301251s 識別號： CODEN: MAMOBX
Appears in Collections:	[Department of Chemical and Materials Engineering] journal & Dissertation

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