- 學位論文
“奈米碳球/聚苯胺”奈米複材的製備及導電與導熱係數之研究
Electrical and Thermal Conductivity of “Carbon Nanospheres/Polyaniline” Composites
摘要
本研究使用化學氧化法，以鹽酸摻雜聚合導電聚苯胺，再以葡萄糖為前趨物，在水熱條件160 °C下3 h製備奈米碳球，之後將碳球與聚苯胺分別以摻混法與原位法製成兩組複合材料，從而探討不同複材導電率與導熱率之滲流現象。 水熱法合成碳球有一定完美的球型，高產量，窄範圍分佈，直徑300至800 nm。與其他合成碳球的方法相比較，此方法更為簡單可行，期待此碳球可和其他碳簇材料相比發展出絕佳性材料，並利用高溫鍛燒法提升原碳球之導電度以及導熱度，結果顯示此碳球導電係數可達17.21 S/cm，其導熱係數可達8.5 W/m K。 摻混法實驗中我們使用聚苯胺粉末和各種不同比例的碳球均勻混合(重量百分比)，然後壓製成圓錠，再利用自製量測模具進行測量導電及導熱性。另外原位聚合法實驗中我們先將碳球依各種不同比例均勻分散至苯胺單體溶液中，再進行聚合反應，可使單體、碳球同時間形成高分子複合材料，同樣進行上述複材之量測導電、導熱性步驟，並比較兩者之差異。發現此法更可縮小碳球添加比達到複材之最佳電、熱平均滲流值，期待可將水熱法碳球及複材研發成具商業化之商品。
並列摘要
This work, polyaniline was doped with hydrochloric acid to polymerization by chemical oxidation monomer, and the carbon spheres were prepared from glucose under hydrothermal conditions at 160 ° C by 3 h. And which the carbon spheres and polyaniline mixed into two kind of composite materials for in situ and solid blending method, respectively. And discussed the two different kind of composite materials with the percolation electrical conductivity and thermal conductivity. Hydrothermal synthesis of carbon spheres could generation perfect spheres, high yield, and narrow size of distribution, diameter from 300 to 800 nm. Compared with various methods have been used to prepare carbon spheres, this method is more simple and facile. It could expect which method compared to other carbon cluster materials can be develop for an excellent material, and we enhance the electrical and thermal conductivity of carbon spheres by calcination method, results that the electrical conductivity enhance to 17.21 S/cm and thermal conductivity enhance to 8.5 W/ m K of carbon spheres, respectively. The solid blending method, is mixing polyaniline and carbon spheres powders with variety of different proportions. Then pressed into home made model for measure electrical conductivity and thermal conductivity. The in-situ polymerization method, the carbon spheres dispersed to the monomer solution by a variety of different ratios and then polymerized. It could make carbon spheres with monomer polymerization at the same time, then similar to the composite material Measurement method, could get the electrical conductivity and thermal conductivity. Finally, we find that in-situ method can reduce the global mixing ratio of composites to achieve the best electrical and thermal conductivity values. Furthermore, carbon spheres and the composites due to development for commercial application.