【摘要】 用DSC手段考察了反应釜内原位共聚制备的含有成核剂及纳米碳酸钙的聚丙烯(PP)共聚物的非等温结晶行为。结果表明,成核剂使PP共聚物的结晶温度升高,结晶度降低,结晶速率略有提高。而纳米碳酸钙则大幅提高了PP共聚物的结晶温度和结晶速率,结晶度也增加了约10%。并采用Ozawa法和Caze法描述了非等温结晶动力学。更多还原

【Abstract】 Non-isothermal crystallization behavior of reactor-made polypropylene (PP) copolymer with or without a nucleating agent and/or nano-calcium carbonate was investigated by means of differential scanning calorimeter (DSC). The results show that PP copolymer with the nucleating agent exhibites a higher crystallization temperature, a slightly higher crystallization rate in terms of the half time and a lower degree of crystalline. But addition of nano-calcium carbonate to PP copolymer greatly increased crystallization temperature and crystallization rate, and degree of crystalline is increased by about 10%, thus being in favor of improving mechanical properties. The Ozawa theory and Caze method were employed to describe the non-isothermal crystallization kinetics.更多还原