【摘要】 以餐厨垃圾发酵液中提取的乳酸丁酯单体为原料,以复配的SnC l2和TSA为催化剂,合成高分子量的聚乳酸.首先乳酸丁酯在160℃下熔融聚合10h合成低聚物,接着在140℃下固相缩聚40h进一步提高分子量.从餐厨垃圾合成的聚乳酸粘均相对分子量可达22000,经红外光谱和XRD测定,该聚合物为聚外消旋乳酸(PDLLA).本工艺省去乳酸丁酯水解生成乳酸的工序,为简化聚乳酸合成路线、避免反应设备的腐蚀、降低餐厨垃圾制取聚乳酸的生产成本提供了新途径.更多还原

【Abstract】 Butyl lactate,extracted and purified from the fermentation broth of kitchen waste,was studied to successfully obtain high-molecular-weight polylactic acid(PLA),catalyzed by a SnCl2/TSA binary system.At first,a solid condensate was prepared by melt polycondensation of butyl lactate at 160℃ for 10h,and then it was subjected to solid-state polycondensation at 140℃ for 40h to increase the molecular weight,which produce PLA with an Mη of 22,000.The results from IR and XRD spectrums showed that the product was poly(D,L-lactic acid)(PDLLA).This process by omitting butyl lactate hydrolysis can afford a new route to simplify synthesis of PLA,avoid the corrosion of equipment,and decrease PLA production cost from kitchen waste.更多还原