實驗分成兩個研究主軸，第一部分是使用丙三醇塑化及醋酸降解，再將PVP/SiO2複合溶膠加入擬熱可塑性木薯澱粉，製成PVP/SiO2改質擬熱可塑性木薯澱粉複合材；第二部分是將聚乙烯混練於第一部分之最佳比例，製備出擬熱可塑性木薯澱粉/PE複合材薄膜。研究結果發現：經TGA測試得知，隨著PVP含量增加，裂解溫度由319.2℃上升至349.7℃；隨著SiO2含量增加，裂解溫度由319.2℃上升至340.1℃。機械性質，以GTSt-P35S8為最佳，強度為5.2 MPa，增強288%；實驗第二部分，隨著擬熱可塑性木薯澱粉增加，複合材之拉伸強度上升，另改質木薯澱粉/PE重量比為70/30強度9.1 MPa、80/20強度10 .2 MPa，且具有較佳成膜性，因此後續加工可採用此為比例。土壤降解分析結果可知，本研究製備樣本複合材70/30、 80/20及90/10經過60天測試可達10.45％、13.97％及13.05%，具生物可分解之效能。因此有利於工業化生產製造與應用。

This study is divided into two parts. The first one is using glycerol to plastify and acetic acid to degrading. Adding PVP/SiO2 into pseudo-thermoplastic cassava starch complex soliquid to formed PVP/SiO2 pseudo-thermoplastic cassava starch. The second part is compounding the best ratio of polyethylene and the first part to formed pseudo-thermoplastic cassava starch /PE films. The result showed that after TGA testing, we knew that along with the PVP content increasing, the cracking temperature rose from 319.2 °C to 349.7 °C. In addition, when the SiO2 content increased, the cracking temperature also rose from 319.2 °C to 340.1 °C. The GTSt-P35S8 had the best of mechanical property, the strength increased 288% to 5.2 MPa. In the second part, along with the increasing of pseudo-thermoplastic cassava starch, the tensile strength of the composite also rose. When the weight ratio of the modified cassava starch was 70/30, the strength was 9.1 MPa, when the weight ratio was 80/20, the strength was 10.2 MPa. Moreover, it has a better film formation so follow up processing can adopt these ratios. According to the result of soil degradation analysis, the biodegradable of the specimens composites in this study can achieved 10.45%, 13.97% and 13.05% after 60 days testing. Thus, it is beneficial for the production and application of industry.

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