- 學位論文
聚醇分子量對聚醚型聚氨酯的熱劣化研究
Thermal degradation of polyether urethanes polymerized from polyols with different molecular weights
摘要
本研究中以不同分子量之聚氧化丙烯二醇 ( Polypropylene glycol, PPG ) 與 1,6-己二異氰酸酯 ( Hexamethylene-1,6-diisocyanate, HDI )聚合，並以紅外線光譜儀 ( Fourier-transform spectrophotometer, FTIR ) 觀察實際聚合情況，再以熱重分析儀 ( Thermogravimetric Analysis, TGA ) 於不同升溫速率下，討論聚合後之聚醚型聚氨酯的劣化情形，以動力學微分法中的 Friedman method 計算活化能及劣化反應級數，討論聚丙二醇分子量與活化能關係及長鏈分子結構影響的程度，結果証實隨 PPG 分子量增加，造成聚氨酯軟鏈段比例增加，劣化溫度升高，裂解活化能隨之升高。實驗並藉由劣化反應級數比較等溫法與非等溫法差異，推測裂化反應機制，且等溫法所得之反應級數n值較非等溫法所得值準確。
並列摘要
The degradation of polyurethanes (PU) prepared by the polymerizations of different molecular weights of polypropylene glycols with hexamethylene diisocyanate is studied with Fourier Transform Infrared Spectroscopy (FTIR) and Thermogravimetric Analysis (TGA). The activation energies and reaction orders of the degradation reactions of prepared specimens are calculated with the Friedman method. From TGA and FTIR results, it is confirmed that the degradation kinetics of PU is dependent on the molecular weight of polypropylene glycol, and the long chain structure in PU significantly affects the activation energy and reaction order. The PU polymerized from the polyol with a larger molecular weight would have a better thermal resistance.
參考文獻
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