現今過度依賴石化燃料，而燃燒石化燃料伴隨的CO2排放，造成溫室效應使得全球年均溫逐漸的上升。但在經濟的考量下，石化燃料的必要性又不可或缺。於是如何節省不可再生石化燃料、減少大氣中的二氧化碳就是很迫切的議題。本研究使用非糧食作物草酸為原料。利用草酸，以很簡單的製程從草本植物中取得、及其生長週期短和較小耕地面積的特性來迅速解決節能減碳之目標。
並以模擬工業化聚酯的製程，使用高溫熔融聚縮合法合成出不同碳鏈長的脂肪
族聚酯，聚草酸二乙酯、聚草酸二丙酯、和聚草酸二丁酯。其中以聚草酸二乙酯之熔點為最高、結晶性最好，不管在高分子材料上與高分子加工上都有較廣的應用。但其熱穩定較差，在約 200℃ 開始熱裂解，重量損失 5％ 的熱裂解溫度為236℃。
接著就以聚草酸二乙酯為基材下，添加較長碳鏈的第三種成份雙酸或雙醇 ，來合成出不同種的脂肪族和芳香族聚草酸共聚酯，以降低聚草酸二乙酯中緊密的酯基含量，來提昇聚草酸二乙酯之熱穩定性。

Currently , the global warming adversely effect the environment . The main reason due to the over dependence on the use of fossil fuels . Carbon dioxide generated from burning fossil fuels led to green house effect . However , fossil fuels is necessary to maintain economic growth . So far , how to reduce non - renewable fossil fuels and decrease the carbon dioxide of the environment arise the great attention of all aspects .
In our studies , we use oxalic acid as a biomass material . The advantages of oxalic acid can benefit the energy saving as well as carbon reduction. Firstly , oxalic acid can be obtained from herb with simple and low-energy process . Secondly , by means of the short life cycle and small cultivated land can be reduced carbon effectively . In our process , we simulate industrial polyester synthesis process by melt poly-condensation polymerization to prepare poly alkylene oxalate with different carbon length . We found that poly(ethylene oxalate) have highest melting and crystallization temperature and enthalpy . Therefore , poly(ethylene oxalate) can find wide application range in polymer material and polymer processing . Unfortunately , this polymer is less stable , showing a threshold temperature for decomposition under programmed heating ( 20℃/min) at about 200°C and a rate maximum in the region of 320°C .
To improve thermal Stability of poly(ethylene oxalate) , we try to add the third longer carbon length element diol or diacid . Finally , we successfully make poly oxalate copolyesters with higher thermal degradation temperature than poly (ethylene oxalate) by decreasing the unit weight of ester group content in the structure .

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