Abstract

Poly(methyl methacrylate) (PMMA)/polystyrene (PS)/carbon black (CB) and poly(ethyl methacrylate) (PEMA)/PS/CB ternary composite films were obtained using solution casting technique to investigate double percolation effect. In both PMMA/PS/CB and PEMA/PS/CB ternary composite films, the CB particles prefer to locate into PS phase based on the results of calculating wetting coefficient, which is also confirmed by SEM images. The conductivity of the films was investigated, and the percolation threshold (ϕ_c) of both ternary composite films with different polymer blend ratios was determined by fitting the McLachlan GEM equation. Conductivity of PMMA/PS/CB ternary composite films showed a typical double percolation effect. However, due to the double emulsion structure of PEMA/PS polymer blends, the PEMA/PS/CB ternary composite films (PEMA/PS = 50/50) showed a higher ϕ_c, even CB only located in PS phase, which conflicts with the double percolation effect. A schematic diagram combined with SEM images was proposed to explain this phenomenon.

中文翻译：

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聚（甲基丙烯酸甲酯）/聚苯乙烯/炭黑和聚（甲基丙烯酸乙酯）/聚苯乙烯/炭黑三元复合膜的电导率

摘要

采用溶液流延技术研究了聚甲基丙烯酸甲酯（PMMA）/聚苯乙烯（PS）/炭黑（CB）和聚甲基丙烯酸乙酯（PEMA）/ PS / CB三元复合膜的双重渗滤效果。在PMMA / PS / CB和PEMA / PS / CB三元复合膜中，基于计算湿润系数的结果，CB颗粒都倾向于进入PS相，这也由SEM图像证实。该薄膜的电导率进行了研究，并逾渗阈值（φ _Ç通过拟合McLachlan GEM方程确定具有不同聚合物共混比的两种三元复合膜的）。PMMA / PS / CB三元复合薄膜的电导率表现出典型的双重渗透作用。但是，由于PEMA / PS聚合物共混物具有双重乳液结构，因此PEMA / PS / CB三元复合膜（PEMA / PS = 50/50）显示出更高的ϕ _c，甚至CB仅位于PS相中，这与双重渗透作用。提出了结合SEM图像的示意图来解释这种现象。