Citation: Jian Wang, Jian-hui Song, Yu-yuan Lu, Yong-jin Ruan, Li-jia An. Phase Behavior and Interfacial Properties of Diblock CopolymerHomopolymer Ternary Mixtures: Influence of Volume Fraction of Copolymers and Interaction Energy[J]. Chinese Journal of Polymer Science, ;2017, 35(7): 874-886. doi: 10.1007/s10118-017-1915-8 shu

Phase Behavior and Interfacial Properties of Diblock CopolymerHomopolymer Ternary Mixtures: Influence of Volume Fraction of Copolymers and Interaction Energy

Jian Wang ^a,b ,
Jian-hui Song ^c ,
Yu-yuan Lu ^a,, ,
Yong-jin Ruan ^a,b ,
Li-jia An ^a

a.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
b.
University of Chinese Academy of Sciences, Beijing 100049, China
c.
School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China

Corresponding author: Yu-yuan Lu, yylu@ciac.ac.cn
Received Date: 12 November 2016
Revised Date: 9 December 2016
Accepted Date: 15 December 2016

Fund Project: the National Natural Science Foundation of China Nos. 21304097the National Natural Science Foundation of China 21334007the National Natural Science Foundation of China 21674113

We use a Monte Carlo method to study the phase and interfacial behaviors of A-b-B diblocks in a blend of homopolymers, A and B, which are confined between two asymmetric hard and impenetrable walls. Our results show that, when the interaction strength is weak, the block copolymers are uniformly distributed in the ternary mixtures under considered concentrations. Under strong interaction strength, distribution region of the block copolymers changes from a single smooth interface to a curved interface or multi-layer interface in the ternary mixtures. Furthermore, our findings show that with increasing volume fraction of A-b-B diblock copolymer (ϕ_C), copolymer profiles broaden while ϕ_C ≥ 0.4, a lamellar phase is formed and by further increasing ϕ_C, more thinner layers are observed. Moreover, the results show that, with the increase of ϕ_C, the phase interface first gradually transforms from plane to a curved surface rather than micelle or lamellar phase while with the increase of the interaction between A and B segments (ε_AB), the copolymer chains not only get stretched in the direction perpendicular to the interface, but also are oriented. The simulations also reveal that the difference between symmetric and asymmetric copolymers is negligible in statistics if the lengths of two blocks are comparable.
- Ternary mixtures,
- Phase behavior,
- Interfacial property,
- Copolymer compatibilizers,
- Monte Carlo simulation
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