论文部分内容阅读
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 (PP) composites were prepared by melt blending method and the effect of nano-diamond on the non-isothermal crystallization kinetics and crystallization morphology of PP under non-isothermal conditions was studied. Jeziorny method and Mo method for non-isothermal crystallization kinetics analysis found that adding an appropriate amount of nano-diamond, PP increased the crystallization peak temperature Tp, speed up the crystallization rate. When the nano-diamond content is 1%, the composite has the highest Avrami rate constant (Zt) and the smallest crystallization rate [F (T)] and half crystallization time (t1 / 2). Polarizing microscope observation of the crystalline morphology found that the nano-diamond / PP composite grain size decreases, the degree of crystal refinement decreased. The activation energy of the composite decreases first and then increases with the increase of the content of nano-diamond. When the nano-diamond content is 3%, the activation energy of the composite reaches the lowest value of 21.08 kJ / mol.