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聚乳酸/二异氰酸酯反应挤出扩链及其产物性能研究    

Chain-extension of Poly(lactic acid) with Diisocyanate by Reactive Extrusion and Properties of the Resultant

文献类型:期刊文献

中文题名:聚乳酸/二异氰酸酯反应挤出扩链及其产物性能研究

英文题名:Chain-extension of Poly(lactic acid) with Diisocyanate by Reactive Extrusion and Properties of the Resultant

作者:毛玮[1];唐颂超[1];王庆海[1];潘泳康[1];王婷兰[1]

机构:[1]华东理工大学材料科学与工程学院,超细材料制备与应用教育部重点实验室,上海200237

年份:2007

卷号:21

期号:2

起止页码:19

中文期刊名:中国塑料

外文期刊名:China Plastics

收录:CSTPCD;;北大核心:【北大核心2004】;CSCD:【CSCD2011_2012】;

语种:中文

中文关键词:聚乳酸;二苯基甲烷二异氰酸酯;反应挤出;扩链

外文关键词:poly(lactic acid) ; methylenediphenyl diisocyanate; reactive extrusion; chain extension

摘要:以溶液法直接合成低相对分子质量聚乳酸为基础,在双螺杆挤出机上与二苯基甲烷二异氰酸酯进行反应挤出,制得高相对分子质量的聚乳酸基聚氨酯,研究了不同NOO/OH摩尔比对产物相对分子质量、热性能和力学性能的影响。结果表明,用反应挤出法对聚乳酸进行扩链是可行的,扩链后聚乳酸的黏均相对分子质量由9.19×10^4提高到23.6×10^4,韧性提高,拉伸断裂强度增大近1倍。
Poly(lactic acid)(PLA) was prepared via solution method and was chain extended with methylenediphenyl diisocyanate in a twin screw extruder. The effect of different NCO/OH mol ratios on molecular weight, thermal characteristics, and mechanical properties was studied. It showed that it was feasible to prepare high molecular weight PLA by twin-screw chain extension. The viscosity-average molecular weight of PLA was increased from 9.19×10^4 to 23.6×10^4 during the chain extending and the tensile strength became nearly 2 times higher.

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