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Flow-Induced Morphologies of Diblock Copolymers in a Nanotube Studied by Dissipative Particle Dynamics Simulation

✍ Scribed by Jian Feng; Honglai Liu; Ying Hu; Jianwen Jiang

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
936 KB
Volume
17
Category
Article
ISSN
1022-1344

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✦ Synopsis

Abstract

Morphologies of diblock copolymers confined in a cylindrical nanotube under a Poiseuille flow were studied by dissipative particle dynamics simulation. Varying with flow intensity, a symmetric diblock copolymer in a neutral tube exhibits parallel lamellae or stacked disks, stacked bowls, or cylinders; the morphologies in a non‐neutral tube are relatively less influenced by flow. An asymmetric diblock copolymer is helical in a neutral tube, but becomes hexagonal under flow; the morphologies in a non‐neutral tube are parallel to the tube axis and vary in a less pronounced manner than in a neutral tube. The simulation results reveal that confinement and external flow significantly affect the phase transitions among a variety of morphologies, particularly for copolymers with domains not parallel to the tube axis.

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