废旧丁腈橡胶粉/聚丙烯复合材料的非等温结晶行为

摘要

The composites of waste nitrile rubber powder/polypropylene and waste nitrile rubber powder/polypropylene grafted maleic anhydride/polypropylene were prepared by melt extrusion. The noniso-thermal crystallization behavior of polypropylene, waste nitrile rubber powder/polypropylene and waste nitrile rubber powder/polypropylene grafted maleic anhydride/polypropylene composites were investigated using differential scanning calorimetry. The non-isothermal crystallization kinetics of the samples were analyzed by Jeziorny equation. The results showedrnthat the crystallization peak temperature, initial crystallization temperature and crystallinity of the samples decreased, but the crystallization rate increased with increasing the cooling rate. The waste nitrile rubber powder could increase the crystallization rate of polypropylene and led to the changes in the mechanisms of crystal nucleation and growth due to its heterogeneous nucleation.%采用熔融共混法制备了废旧丁腈橡胶粉/聚丙烯(WNBR/PP)和废旧丁腈橡胶粉/聚丙烯接枝马来酸酐/聚丙烯( WNBR/PP-g-MAH/PP)复合材料,采用差示扫描量热仪研究了PP、WNBR/PP及WNBR/PP-g-MAH/PP复合材料的非等温结晶过程,并通过Jeziorny方程研究了复合材料的非等温结晶动力学.结果表明,随降温速率的增大,所有试样的结晶峰温和结晶起始温度均向低温偏移,结晶度减小,结晶速率增大.WNBR能起到异相成核的作用,提高了PP的结晶速率,并且导致PP结晶成核和生长机理发生改变.