PP/PP-g-MAH/废PCB粉复合材料非等温结晶动力学研究

Study on Non-isothermal Crystallization Kinetics of Polypropylene Matrix Composites with Maleic Anhydride-grafted Polypropylene and Waste Printed Circuit Boards Nonmetallic Powders

利用差示扫描量热法结合Avrami方程研究了聚丙烯(PP)、聚丙烯/聚丙烯接枝马来酸酐/废印刷电路板非金属粉复合材料(PP/PP-g-MAH/废PCB粉)的非等温结晶动力学行为,根据Avrami方程的Jeziorny法和莫志深法对数据进行处理。结果表明,废PCB粉在PP基体中起到异相成核作用,提高了PP的结晶温度,使其成核速率加快,晶粒分布变窄,结晶速率增大,但当废PCB粉含量过多时,复合材料体系黏度会增大,使PP链段扩散迁移并进行规整有序排列的速度受到影响,导致结晶速率下降。

The nonisothermal crystallization behaviors and kinetics of polypropylene(PP)matrix composites with maleic anhydride-grafted PP(PP-g-MAH)and waste printed circuit boards(PCB)nonmetallic powders was studied with the Avrami equation using differential scanning calorimetry.The modified Avrami theories from Jeziornys and Mo Zhi-shens equations were adopted to analyze the DSC data.The results indicated that waste PCB powders exhibited a heterogeneous nucleation effect on the crystallization of PP.With increasing the crystallization temperature of PP,the nucleation rate became faster,the grain size distribution became narrower,and the crystallization rate was also improved.However,due to increasing of viscosity of composites,the waste PCB powders also prevented the PP matrix from crystallization at a high loading due to the increase of viscosity of composites.