【摘要】 用X射线衍射仪对碳酸钙级配填充聚丙烯 (PP)的结晶形态进行了研究 ,发现PP中碳酸钙的填充可以对 β晶结晶起异相成核作用 ,并可以降低 β晶向α晶的转化速率 ,促进 β晶的形成和保持。有效的级配能够引起体系粘度下降 ,有利于提高 β晶的生成速率 ,进而使体系的 β晶含量和结晶度得到提高 ,使填充PP材料的冲击强度得到大幅度提高更多还原

【Abstract】 Crystal structure of PP filled with size grading calcium carbonate CaCO 3 is studied by XRD. It shows that incorporating calcium carbonate into PP has an effect of heterogeneous nucleation on β-form crystal, decreasing the rate of β-form crystal transforming into α-form crystal and resulting in the formation and retention of β-form crystal transforming into α-form crystal. Effective size grading of CaCO 3 can lead to viscosity decrease of the system, increase the forming rate of β-form crystal and the ratio of β-form crystal and crystal degree,thus upgrading the impact strength of the system.更多还原