介孔二氧化硅基导电聚合物复合材料热导率的实验研究

摘要

Conductive polymers polyaniline（PANI） and polypyrrole（PPy） loaded mesoporous silica（SBA-15） composites are prepared and characterized.The one-dimensional reference bar method and the relevant devices to measure the thermal conductivity are introduced and established.The equivalent pore diameter is proposed to characterize the mesostructures of conductive polymers polyaniline（PANI） and polypyrrole（PPy） in PANI/SBA-15 and PPy/SBA-15 composites.The effects of the equivalent and the measurement pore diameters on thermal conductivities of PANI/SBA-15 and PPy/SBA-15 composites are analyzed.The result shows that thermal conductivities of PANI/SBA-15 and PPy/SBA-15 are higher than that of the substrate SBA-15;the thermal conductivity of PANI/SBA-15 is higher than that of PPy/SBA-15;loading of PANI and PPy in pores of PANI/SBA-15 and PPy/SBA-15 composites is more effective than loading outside of pores for improving the thermal conductivities of PANI/SBA-15 and PPy/SBA-15 composites.%本文首先制备并表征了介孔二氧化硅SBA-15、填充导电聚合物的复合材料PANI/SBA-15和复合材料PPy/SBA-15,并建立双流计实验台开展了材料压片情况下的热导率研究.在测量得到复合材料热导率的基础上,引入当量孔径,结合测量孔径对PANI/SBA-15和PPy/SBA-15复合材料热导率随填充量的变化进行了定性分析.分析表明：PANI/SBA-15和PPy/SBA-15复合材料的热导率比基材SBA-15的热导率大得多;在相同的测量孔径和当量孔径情况下,PANI/SBA-15复合材料的热导率比PPy/SBA-15复合材料的热导率大;导电聚合物填充到复合材料孔道内和孔道外都有助于热导率的提高,填充到孔道内比填充到孔道外对热导率提高的贡献更大.