本研究利用聚乳酸，在塑譜儀180℃、60 rpm下，以雙酚A型與酚醛型環氧樹脂進行擴鏈，期望羧基與環氧基反應，達到鏈增長的效果。因熔融混煉會使聚乳酸熱裂解產生出更多的羧基端，故我們添加羧基與環氧基莫爾比1:4與1:8 的過量環氧樹脂進行擴鏈，並以四丁基溴化銨(TBAB)做為催化劑。混煉時，我們先將聚乳酸在塑譜儀鍾預混3分鐘，待其完全熔融後再將環氧樹脂與催化劑一併加入，總混煉時間為10分鐘。由實驗結果發現，多官能基之酚醛型環氧樹脂的擴鏈效果比雙官能基之雙酚A型環氧樹脂好，聚乳酸與多官能基環氧樹脂擴鏈後，分子量明顯上升，且添加催化劑後，擴鏈效果更加顯著。接著我們再把擴鏈後的產物，測試其物性，並探討添加不同環氧樹脂擴鏈後的影響。 Chain exdention of Polylactic acid by diglycidyl ether of bisphenol A (DGEBA) and Phenolic epoxy resin were perfomed in this study. Brabender was used for the melt blending, and the reaction were carried out at 180℃ and 60 rpm. Since melt mixing caused polymer degradation and the formation of carboxy groups, the ratios of initial carboxyl to epoxy group that we used were 1:4 and 1:8. Tetrabutylammonium bromide (TBAB) was used as the catalyst. The experimental results show that the chain exdending effect of the phenolic epoxy resin with multiplefunctional groups is better than the Bisphenol-A type epoxy resin with bifunctional groups. Molecular weight increased significantly when the former epoxy was used as the chain extender. Catalyst showed drastic effect on the reactions. Thermal properties as well as the rheologied properties were further investigated.
