纳米金刚石/PP复合材料的非等温结晶行为

Non-isothermail behavior of nano-diamond/polypropylene composite

采用熔融共混的方法制备了纳米金刚石/聚丙烯(PP)复合材料,并研究了纳米金刚石在非等温条件下对PP非等温结晶动力学和结晶形态的影响。用Jeziorny法和Mo法对非等温结晶动力学分析发现,添加适量的纳米金刚石,提高了PP的结晶峰值温度Tp,加快了结晶速率。当纳米金刚石添加量为1%时,复合材料的Avrami速率常数(Zt)最大,结晶速率[F(T)]和半结晶时间(t1/2)最小。偏光显微镜观察结晶形态发现,纳米金刚石/PP复合材料的晶粒尺寸减小,结晶完善程度有所下降。复合材料的结晶活化能随着纳米金刚石含量的增加呈现先减少后增加,当纳米金刚石含量为3%时,复合材料的结晶活化能达到最低值21.08kJ/mol。

The nano-diamond/polypropylene composites were prepared by melt blending.The non-isothermail crystallization kinetics and crystal morphologies of composites were investigated.It was found that the nano-diamond could increase the crystallization peak temperature and crystallization rate.When the content of nano-diamond was 1%,Ztreached the minimum,F（T）and t1/2were lowest.Additionally,the spherulites become smaller and more homogeneous.The activation energy of composites reduced first then increased with increasing content of nano-diamond.When the content of nanodiamond was 3%,the composite reached the minimum 21.08kJ/mol.