TY - JOUR

T1 - Effects of macromolecular architecture on the micellization behavior of complex block copolymers

AU - Lin, Chun Min

AU - Chen, Yo Zen

AU - Sheng, Yu Jane

AU - Tsao, Heng Kwong

N1 - Funding Information:
This research is supported by National Council of Science of Taiwan. Computing time, provided by the National Center for High-Performance Computing of Taiwan is gratefully acknowledged.

PY - 2009/7

Y1 - 2009/7

N2 - 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 ByAx and (II) miktoarm stars (By)n(Ax)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 > 1 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 ≈ 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.

AB - 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 ByAx and (II) miktoarm stars (By)n(Ax)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 > 1 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 ≈ 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.

KW - Complex block copolymers

KW - Dissipative particle dynamics

KW - Macromolecular architecture

KW - Micellization behavior

UR - http://www.scopus.com/inward/record.url?scp=67349181697&partnerID=8YFLogxK

U2 - 10.1016/j.reactfunctpolym.2008.12.007

DO - 10.1016/j.reactfunctpolym.2008.12.007

M3 - 期刊論文

AN - SCOPUS:67349181697

VL - 69

SP - 539

EP - 545

JO - Reactive and Functional Polymers

JF - Reactive and Functional Polymers

SN - 1381-5148

IS - 7

ER -