Journal
POLYMER
Volume 53, Issue 20, Pages 4448-4454Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2012.08.030
Keywords
Dissipative particle dynamics; Polymer blends; Graft copolymer
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Funding
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0942]
- Zhejiang Provincial Natural Science Foundation of China [Y4090319]
- State Key Laboratory of Chemical Engineering [SKL-ChE-11D01]
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The dissipative particle dynamics (DPD) is used to study the compatibilizing process of an immiscible polymer blend using a graft copolymer as a compatibilizer. Polystyrene (PS) and polyamide 6 (PA6) are chosen as the polymer components of the blend. The graft copolymer is composed of PS as the backbone and PA6 as the grafts. Mesoscale morphology, density distribution, end-to-end distance of PA6 and interfacial tension are investigated. Simulations show that the presence of a graft copolymer contributes to the formation of finer and more uniform dispersed domains by preventing them from collision and coalescence. In the presence of a graft copolymer, the density distribution is more uniform and the dynamic equilibrium of the blend morphology is reached more rapidly. For a given backbone and number of grafts per backbone, the compatibilizing efficiency of the graft copolymer first increases with increasing graft length. However, when the graft length exceeds a certain value, it starts decreasing. (C) 2012 Elsevier Ltd. All rights reserved.
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