本研究主要是探討PLLA-聚烷二醇 Copolymer添加蒙脫土(Montmorillonite)(Clay)奈米複合材料之熱行為模式。利用四級胺鹽藉由離子交換法將親水性之片狀蒙托土有機化改質，使蒙托土層間距擴大。改性後之蒙托土利用溶液插層法使其均勻分散在PLLA-聚烷二醇 Copolymer高分子基材中製備成奈米級聚合物。Transmission Electron Microscope(TEM)觀測Clay是否均勻分散於PLLA-聚烷二醇 Copolymer中。利用Thermo gravimetry Analyzer (TGA)用來觀測添加不同比例Clay後的PLLA-聚烷二醇 Copolymer熱穩定性是否因Clay添加而改變。Wide-Angle X-ray Diffraction(WXRD)鑑定PLLA-聚烷二醇 Copolymer於添加Clay前後晶體結構以及晶面位移。Differential Scaning Calorimetry (DSC)則是用來量測PLLA-聚烷二醇 Copolymer添加不同比例Clay後熱性質與結晶性質改變，藉由Polarization Microscope (POM)可以觀測到材料添加不同比例Clay後之長晶情形及晶體的大小。實驗結果得出添加Clay能增強PLLA-聚烷二醇 Copolymer的熱穩定性，並且會明顯改變材料的結晶性質。

This study explored the thermal behavior of PLLA copolymer nanocomposite with added organoclay (montmorillonite). The quaternary ammonium salt used to organically modify the hydrophilic montmorillonite via ion exchange led to expansion of its d-spacing. The modified clay was then evenly dispersed into the matrix of PLLA copolymer via solution intercalation method to synthesize the nanoscale polymer. Transmission electron microscopy was used to observe whether the clay was uniformly dispersed in the PLLA copolymer. Thermogravimetric analysis was used to observe whether the thermal stability of the PLLA copolymer changed due to clay addition. Wide-angle X-ray diffraction analysis was used to identify the crystal structure and lattice displacement of PLLA copolymer before and after the clay addition. Differential scanning calorimetry was used to measure the changes in thermal and crystal properties of PLLA copolymer at various ratios of clay under non-isothermal crystallization and isothermal crystallization conditions. The crystal growth and crystal size of the nanocomposites with various ratios of clay was observed by polarized optical microscopy. The experimental results show that adding clay could enhance the thermal stability of PLLA copolymer and significantly change its crystal property.

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