高聚合度PVC与丁腈橡胶共混物的微观结构

Microstructure of HPVC/NBR blend

采用分子模拟方法,研究了高聚合度聚氯乙烯(HPVC)链单元和丁腈橡胶(NBR)中的丙烯腈单元的结构尺寸、电荷分布以及HPVC/NBR共混物的微观结构。结果发现,HPVC链单元与NBR中丙烯腈单元的结构尺寸、电荷分布基本相似,这是NBR与PVC相容性较好的内在原因;NBR在共混物中的形态随着其用量的增加由分散相变为连续相,共混物经剪切后出现明显的层状结构。

This paper studied the structure size and charge distribution of chain units in high polymerization degree polyvinyl chloride （HPVC） and acrylonitrile units in nitrile rubber （NBR） as well as the microstructure of HPVC/NBR blend by means of molecular simulation method. The result reveals that there exists a similarity in structure size and charge distribution between the chain units in HPVC and the acrylonitrile units in NBR; this similarity is considered as the intrinsic reason for the superior compatibility between HPVC and NBR. The morphology of NBR in the blend is changed from dispersed phase to continuous phase as its dosage increases. There appears a distinct lamellar structure inside the blend after it underwent shearing process.