To investigate how the multiphase structures affect the electrical conductivity in semi-crystalline polymer composites, herein, an accurate multiphase content calculation method is proposed and verified, which combines amorphous phase information in broadband dielectric spectroscopy and crystalline phase information in differential scanning calorimetry. Taken aluminium hydroxide (ATH) filled silicone rubber as an example, it is found that the rigid amorphous fraction (RAF) corresponding to the chains constrained by crystals (RAF_cry) is not linearly increased with crystalline fraction (CF). Compared to non-isothermal crystallisation, RAF caused by ATH/silicone rubber interface (RAF_int) after isothermal crystallisation at 213 K changes little, while mobile amorphous fraction and RAF_cry is attenuated and CF is strengthened. Based on the calculated structures of ATH filled silicone rubber, activation energy of conductivities during cooling is dominated by the thermal transition for conductive ions and shortened distance among the conductive ions through shrunk volumes of the amorphous phase. Our findings deepen the understanding of multiphase content in semi-crystalline polymer composites and its relationship with electrical conductivity, which can be applied in manipulating electrical performance of semi-crystalline polymers by fillers.

中文翻译：

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多相含量对硅橡胶复合材料中温度相关电导率的影响

为了研究多相结构如何影响半结晶聚合物复合材料的电导率，本文提出并验证了一种准确的多相含量计算方法，该方法结合了宽带介电光谱中的非晶相信息和差示扫描量热法中的结晶相信息。以氢氧化铝（ATH）填充的硅橡胶为例，发现与结晶约束链（RAF _cry）相对应的刚性非晶分数（RAF）并不随结晶分数（CF）线性增加。与非等温结晶相比，在 213 K 等温结晶后由 ATH/硅橡胶界面 (RAF _{int ) 引起的 RAF 变化很小，而流动的无定形分数和 RAFcry}减弱，CF增强。基于 ATH 填充硅橡胶的计算结构，冷却过程中电导率的活化能主要受导电离子的热转变和导电离子之间通过非晶相体积缩小而缩短的距离决定。我们的研究结果加深了对半结晶聚合物复合材料中多相含量及其与电导率的关系的理解，这可用于通过填料控制半结晶聚合物的电性能。