高分子-黏土奈米複合材料之合成及介電特性研究

Synthesis and Dielectric Properties of Polymer-Clay Nanocomposite Materials

張光欽(Kung-Chin Chang)

指導教授 ： 王宏文

中原大學/理學院/化學研究所/碩士(2004年)

https://doi.org/10.6840/cycu200400102

摘要

摘 要
本研究主要是利用層間插入法及In-situ (單體聚合)法將有機化Clay 分散在Polystyrene、Poly(styrene-co-acrylonitrile)及Polyimide等三種高分子中。藉由WXRD及FTIR證實Polymer與Clay二者已混成成功，另外並利用TEM的鑑定，證實了Clay在三種Polymer中皆已達到奈米級的分散。本研究在奈米混成材料的特性上，主要測量下列三項基本特性：(1)在熱性質和機械性質方面，我們利用TGA、DSC及DMA的量測，證實三種複合材料的熱性質和機械性質皆會隨Clay摻入量的增加而隨之提升。(2)在吸水性方面，主要是針對Polyimide-Clay此複合材料，由量測後的數據得知，其吸水性會隨Clay摻入量的增加而有降低的現象。(3)在介電特性方面，主要是研究三種複合材料在變頻、變溫下其介電行為的變化。在PS-Clay及Poly(SAN)-Clay系統中，Clay是屬於隨機(randomly)狀態的分散，此奈米級分散會抑制高分子區域性轉向移動(Local re-orientation dynamics) 的效應，受此效應的影響，會使極化機制中的dipole orientation對介電常數沒有貢獻，故介電常數會降低。而在PI-Clay系統中，PI會因Clay的加入導致PI的結構在高溫時Free volume變大，因此使得分子間packing較鬆散，故介電常數會降低。

關鍵字

介電特性 ； 高分子-黏土奈米複合材料

並列摘要

Abstract
Clay-dispersed polystyrene (PS)、poly(styrene-co-acrylonitrile) (PSA) and polyimide (PI) nanocomposties were synthesized by intercalation and in-situ polymerization processes. By using the wide angle X-ray diffraction, FTIR spectroscopy and TEM technique, it is confirmed that polystyrene (PS)、poly(styrene-co-acrylonitrile) (PSA) and polyimide (PI) were inserted between the interlayer of montmorillonite (MMT) clay. The enhanced thermal and mechanical properties of PsCN、PSAN and PiCN with the addition of clay was studied by the TGA、DSC and DMA. The reduced moisture absorption of PiCN was found to be related with the addition of clay. The dielectric properties of PsCN、PSAN and PiCN were measured under different frequencies and temperatures. It is firstly understood that the nanocomposites may exist a lower dielectric constants and losses due to the intercalation and exfoliation of nano-clay.

並列關鍵字

Dielectric Properties ； Polymer-Clay Nanocomposite Materials

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