固相法低氯含量氯化聚乙烯的合成与性能研究EI

本工作采用搅拌式固相法两段氯化研究了氯含量为8～25％的氯化聚乙烯的性能。结果表明:氯含量相同时,两段氯化程度比值减小,结晶度降低,断裂伸长率上升,撕裂强度下降,熔体指数增大;拉伸强度随两段氯化程度比的改变,都出现高峰值和最低值,出现峰值时的两段氯化比值取决于产物氯含量;第二段氯化程度高,溶解剩余值变小,热分解温度增高,透光性能变优。两段氯化程度比不变。总氯含量增高,产物的结晶度、断裂伸长率、撕裂强度、熔体指数、溶解剩余值和热分解温度降低,透光率提高;拉伸强度则随氯含量增加出现最低值,然后上升出现高峰值,此值不同,出现最低值时的氟含量不同,两段氯化比值为9的氯含量为20％的LCPE,其拉伸强度最高。

THE SYNTHESIS AND PROPERTIES OF SOLID STATE CHLORNATED PE WITH LOW CHLORINE CONTENT

The chlorinated LCPE with 8 -25% chlorine was synthesed in solid state with stirring by two-step chlorinatian under low and high temperature. In the same Cl content, if the Cl content ratio of two steps decreases, the crystal content and tear -resistance strength decrease, but the elongation and melting index increase. The highest and lowest tensile strength show in different Cl content ratio of two steps and are subject to the total Cl content of the product, If the Cl content of second step increases the gel content decreases, but the heat resistance and the transparent property increase. In the same Cl content ratio of two step the crystal content, elongation, tear-resistance strength, melting index, gel content and heat-resistance decrease when the total Cl content increases, but the transparent property increases. The tensile strength reaches the lowest point and the highest point as the total Cl content increases, and the lowest point is subject to the Cl content ratio of two steps.The best tensile strength shows in the Cl content ratio of two steps 9 and the total Cl content 20%.