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聚乙酸內酯/聚乙烯醇縮丁醛導電奈米複合材料之結晶,型態與電性研究

Conductive-Filler-Filled Poly(ε-caprolactone)/Poly(vinyl butyral) Nanocomposites:Crystallization,Morphology and Electric Properties.

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[[abstract]]摘要 高分子奈米複合材料具備諸多獨特的功能特性及優異的機械性質,因而引起諸多新研究領域,本研究運用奈米材料之分散技術,使導電填材碳黑能夠均勻地分散,以形成良好之導電通路,使導電高分子混摻物具有良好之電性。本實驗中以摻混導電碳黑於經由界面活性劑改質後之奈米黏土中,再加入結晶/非結晶之聚乙酸內酯(PCL)/聚乙烯醇縮丁醛(PVB)高分子共聚物中來探討其電性結果,同時並以X-ray繞射分析及偏光顯微鏡之觀察來探討添加非結晶聚乙烯醇縮丁醛對聚乙酸內酯的結晶型態之影響及其所對應之電性的變化。結果顯示黏土經表面改質後有撐大其分子之層間距離,使導電碳黑達到均勻地分散,進而使電性提昇;對於分子量較大之PCL具有較好之PTC效應,而添加不同分子量之微量PVB對電性有很大地影響,PVB含量為5%時具有最好之PTC強度(IPTC),而摻混微量奈米黏土之後,其IPTC約可以增加1.5~2倍左右。由球晶的觀察結果可知,添加微量之PVB對PCL球晶會產生扭曲效應,導致PTC效應更加明顯;而微量之奈米黏土有助於扭曲效應,使球晶之波帶間隔變得更小,進而更加提昇了PTC效應及強度。

[[abstract]]Abstract Polymer nanocomposites in which a polymer component is dispersed in a ultrafine state, such as nano-meter scale, have been attracting interest as a new research field based on their excellent thermal, mechanical and anti-combustion properties. In this thesis, we have adapted this concept and used nano-scale treated clay as the intercalation media of carbon black to prepare the conductive-filler-filled polymer nanocomposites. A crystalline/amorphous system (polycaprolactone(PCL)/polyvinyl butyral(PVB)) has been prepared and mixed with nano-scale dispersion carbon black. The effect of additional nano-scale materials in PCL/PVB on the crystallization, morphology and electrical properties has been studied. In particular, these polymer nanocomposites containing critical carbon black content to build up continuous conductive network is referred as the percolation network to show positive temperature coefficient(PTC) properties have been discussed in this thesis.

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