基于SCFNA法辊压制备PDMS/SCF导电复合材料

Preparation of PDMS/SCF Conductive Composite by Rolling Based on SCFNA Method

利用空间限域强制组装法(SCFNA)的辊压成型方法制备了PDMS/SCF导电复合材料,并且,与传统平板热压印方式制备的PDMS/SCF导电复合材料的微观形貌、导电性能和拉伸力学性能进行对比分析。结果表明,采用SCFNA辊压方式制备的PDMS/SCF导电复合材料可以使碳纤维在聚合物基体内形成密实的导电网络,实现了强制组装;并且,由于辊子反复辊压混料,聚合物基体中的碳纤维发生了取向,因此,在碳纤维含量相同的情况下,与平板热压印法相比,辊压方法制备的PDMS/SCF导电复合材料具有更好的电学性能和拉伸力学性能;在碳纤维质量分数为6%的情况下,复合材料的电导率最大提高了105.1%,拉伸强度提高了18.6%,断裂伸长率提高了9.16%。

The PDMS/SCF conductive composite were prepared by the roll forming method designed using the Spatial Confining Network Assembly method,and the microscopic morphology,electrical conductivity and tensile mechanical properties of the PDMS/SCF conductive composite were compared with those prepared by the conventional flat plate hot embossing method.The results showed that the preparation of PDMS/SCF conductive composite using the SCFNA roller pressing method also enables the formation of dense conductive networks and forced assembly of carbon fibers within the polymer matrix,and the orientation of the carbon fibers in the polymer matrix due to repeated roll mixing of the rolls,which results in better electrical and tensile mechanical properties of PDMS/SCF conductive composite prepared by roll pressing compared to the flat plate hot embossing method for the same carbon fiber content.At a carbon fiber mass fraction of 6%,the composite showed a maximum increase in electrical conductivity of 105.1%,an increase in tensile strength of 18.6%and an increase in elongation at break of 9.16%.