本研究主要是探討PLLA-PPG1000 Copolymer(LPG1000)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-PPG1000 Copolymers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-PPG1000 Copolymer中。利用Thermo gravimetry Analyzer (TGA)用來觀測添加不同比例Clay後的PLLA-PPG1000 Copolymer熱穩定性是否因Clay添加而改變。Wide-Angle X-ray Diffraction(WXRD)鑑定PLLA-PPG1000 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LPG1000添加不同比例Clay後熱性質與結晶性質改變，分為非等溫結晶實驗與等溫結晶實驗。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-PPG1000 Copolymer的熱穩定性，並且會明顯改變材料的結晶性質。
關鍵字:結晶性、奈米複合材料、蒙脫土

This study explored the thermal behavior of PLLA–PPG1000 copolymer (LPG1000) 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 LPG1000 via solution intercalation method to synthesize the nanoscale polymer. Transmission electron microscopy was used to observe whether the clay was uniformly dispersed in the LPG1000. Thermogravimetric analysis was used to observe whether the thermal stability of the LPG1000 changed due to clay addition. Wide-angle X-ray diffraction analysis was used to identify the crystal structure and lattice displacement of LPG1000 before and after the clay addition. Differential scanning calorimetry was used to measure the changes in thermal and crystal properties of LPG1000 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-PPG1000 Copolymer and significantly change its crystal property.
Key Words: crystallization; nanocomposites; organoclay

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