Liu Dongmei, Yang Meiyuan, Wang Danping, Jing Xueying, Lin Ye, Feng Lei, Duan Xiaozheng
School of Science, North China University of Science and Technology, Tangshan 063210, China.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
Polymers (Basel). 2021 Aug 26;13(17):2866. doi: 10.3390/polym13172866.
Using the method of dissipative particle dynamics (DPD) simulations, we investigated the interfacial properties of PEO/PEO-PPO-PEO/PPO ternary blends composed of the Pluronics L64(EOPOEO), F68(EOPOEO), F88(EOPOEO), or F127(EOPOEO) triblock copolymers. Our simulations show that: (i) The interfacial tensions (γ) of the ternary blends obey the relationship γF68 < γL64 < γF88 < γF127, which indicates that triblock copolymer F68 is most effective in reducing the interfacial tension, compared to L64, F88, and F127; (ii) For the blends of PEO/L64/PPO and the F64 copolymer concentration ranging from = 0.2 to 0.4, the interface exhibits a saturation state, which results in the aggregation and micelle formation of F64 copolymers added to the blends, and a lowered efficiency of the L64 copolymers as a compatibilizer, thus, the interfacial tension decreases slightly; (iii) For the blends of PEO/F68/PPO, elevating the Pluronic copolymer concentration can promote Pluronic copolymer enrichment at the interfaces without forming the micelles, which reduces the interfacial tension significantly. The interfacial properties of the blends contained the PEO-PPO-PEO triblock copolymer compatibilizers are, thus, controlled by the triblock copolymer structure and the concentration. This work provides important insights into the use of the PEO-PPO-PEO triblock copolymer as compatibilizers in the PEO and PPO homopolymer blend systems.
采用耗散粒子动力学（DPD）模拟方法，我们研究了由普朗尼克L64（EOPOEO）、F68（EOPOEO）、F88（EOPOEO）或F127（EOPOEO）三嵌段共聚物组成的PEO/PEO-PPO-PEO/PPO三元共混物的界面性质。我们的模拟结果表明：（i）三元共混物的界面张力（γ）符合γF68 < γL64 < γF88 < γF127的关系，这表明与L64、F88和F127相比，三嵌段共聚物F68在降低界面张力方面最有效；（ii）对于PEO/L64/PPO共混物以及F64共聚物浓度范围为 = 0.2至0.4的情况，界面呈现饱和状态，这导致添加到共混物中的F64共聚物发生聚集和胶束形成，并且L64共聚物作为增容剂的效率降低，因此界面张力略有下降；（iii）对于PEO/F68/PPO共混物，提高普朗尼克共聚物浓度可促进普朗尼克共聚物在界面处富集而不形成胶束，这显著降低了界面张力。因此，含有PEO-PPO-PEO三嵌段共聚物增容剂的共混物的界面性质由三嵌段共聚物结构和浓度控制。这项工作为在PEO和PPO均聚物共混体系中使用PEO-PPO-PEO三嵌段共聚物作为增容剂提供了重要见解。
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