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Monte Carlo Simulation of ABA Triblock Copolymer Melts Confined in a Cylindrical Nanotube

✍ Scribed by Xingqing Xiao; Yongmin Huang; Honglai Liu; Ying Hu

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
682 KB
Volume
16
Category
Article
ISSN
1022-1344

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✦ Synopsis

Abstract

Monte Carlo simulations were used to identify the microphase morphologies of ABA triblock copolymer melts confined in a cylindrical nanotube. The influences of the volume fraction of mid‐block B (f~B~), the radius of nanotube (R) and the asymmetry of ABA triblock copolymer chain were discussed in detail. When f~B~ varies, a series of double‐continuous, three‐layer concentric cylinder barrel, porous net, double helixes and the new multiplex structures were observed under different conditions. In addition, the stacked disk, catenoid‐cylinder and multi‐layer concentric cylinder barrel structures occur in turns at changing R. The relation between circular lamellae period L and layer number N~layer~ of concentric cylinder barrel with the increase of R was investigated to further explain the put‐off phenomenon of microphase transition of the multi‐layer concentric cylinder barrel structures. As for the increase of the asymmetry of ABA triblock copolymer chain, it was concluded that the short A~I~ segments tend to site at the interface between rich A and B circular lamellae.

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