Effects of macromolecular architecture on the micellization behavior of complex block copolymers

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Title:	Effects of macromolecular architecture on the micellization behavior of complex block copolymers
Authors:	Lin,CM;Chen,YZ;Sheng,YJ;Tsao,HK
Contributors:	化學工程與材料工程學系
Keywords:	DISSIPATIVE PARTICLE DYNAMICS;MESOSCOPIC SIMULATION;TRIBLOCK COPOLYMERS;SELECTIVE SOLVENTS;DIBLOCK COPOLYMERS;POLYMERIC MICELLES;MONTE-CARLO;MEAN-FIELD;STAR;POLYSTYRENE
Date:	2009
Issue Date:	2010-06-29 17:26:49 (UTC+8)
Publisher:	中央大學
Abstract:	The effect of macromolecular architecture on the aggregative behavior of A-B block copolymers with different complex structures in selective solvents was studied by Dissipative Particle Dynamics. We focus on two types of diblock copolymers, (I) asymmetric linear diblocks B(y)A(x) and (II) miktoarm stars (B-y)(n)(A(x))(m), where A block is solvophilic and B block solvophobic. Note that y and x are the block lengths of A and B blocks; n and m denote arm numbers of A and B blocks in the star. For type I linear copolymer with a given ratio of y/x, the aggregation number varies with the total length (x + y) for y/x > I but is essentially independent of the total length for y/x <= 1. For type II star copolymer with m . x = 24 and n . y = 24, the aggregation number varies with the branch number m at a given number of solvophobic blocks n. There exists a minimum aggregation number at m approximate to 4 so that declines first and then grows with increasing the branch number. Moreover, increases as the polymer concentration is increased. Our simulation results indicate that at a given chemical composition, the micelle properties such as aggregation number and micellar morphology may vary with the macromolecular architecture, (C) 2008 Elsevier Ltd. All rights reserved.
Relation:	REACTIVE & FUNCTIONAL POLYMERS
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] journal & Dissertation

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