齐格勒-纳塔等规聚丙烯和茂金属等规聚丙烯共混物结晶热力学研究

Study on Crystallization Thermodynamics of Ziegler-Natta Catalyzed Isotactic Polypropylene and Metallocene Catalyzed Isotactic Polypropylene Blends

通过机械共混的方法制备了不同质量分数的齐格勒纳塔等规聚丙烯和茂金属等规聚丙烯的共混物 ,并对其结晶热力学进行了研究和比较。通过实验发现 ,共混物有共晶形成 ;当茂金属等规聚丙烯的比例占半数以上时 ,随着齐格勒纳塔等规聚丙烯含量的提高 ,共混物的熔点增加较为明显 ;当齐格勒纳塔等规聚丙烯的含量超过 5 0 %时 ,随着茂金属等规聚丙烯含量的降低 ,共混物的熔点变化不明显。

Ziegler Natta catalyzed isotactic polypropylene and metallocene catalyzed isotactic polypropylene blends with different weight percentages are prepared by mechanical mixing and their crystallization thermodynamics are studied DSC, X ray diffraction and polarized light microscopy results show that there exists eutectic crystal in the blends and that there are melting points shift in the blend samples