物料压缩比对PVC凝胶化行为的影响

Effect of Material Compression Ratio on Gelation Behavior of PVC

利用转矩流变仪制备聚氯乙烯(PVC)共混物,研究了物料压缩比对PVC凝胶化行为的影响。结果表明:随着物料压缩比增加,PVC凝胶化速度加快,有利于破碎出更多微米级的初级粒子,在相同外部能量作用下,PVC凝胶化度先增加后降低。PVC共混物在扭矩最低点和最高点存在不同的结构和流动机理。

Polyvinyl chloride(PVC)blend was prepared by torque rheometer,and the effect of material compression ratio on the gelation behavior of PVC was investigated.The results show that with the increase of material compression ratio,the gelation speed of PVC increases,and more micron-level primary particles are broken out.Under the same external energy,the gelation degree of PVC first increases and then decreases.PVC blend has different structures and flow mechanism at the lowest and highest torque points.