化学降解对IPP流变性能的影响

Effects of Chemical Degradation on the Rheological Behaviour of IPP

通过双螺杆混炼挤出造粒，制备了加有不同添加量的化学降解改进剂的一系列试样，采用凝胶渗透色谱（ＧＰＣ），ＨＡＡＫＥ流变仪等，研究了ＩＰＰ经化学降解后的相对分子质量、分子量分布，讨论了化学降解ＩＰＰ分子量分布变窄的机理，分析了熔体在相对静止状态及受力流动时分子运动及流变性能的影响因素。

A series of chemical degraded IPP samples were prepared with twin screw blend machine. Their molecular weight, distribution of molecular weight and rheological behaviour have been studied with GPC and HAAKE rheogonimeter. The mechanism of MWD changing to narrower of IPP after chemical degradation is discussed. The effects on rheological behaviour and on molecular movement when melt is in relative static condition or is flowing at pressure are analyzed. It is discovered that the effects of chemical degradation on reological behaviour and on MWD are similar in the mechanism to a certain respect.