片状nano-ZnO对PP非等温结晶动力学的影响

The Effect of Sheet Nano-Zno on the Non-isothermal Crystallization Kinetics of PP

采用示差扫描量热法(DSC)研究了聚丙烯(PP)/片状纳米氧化锌(nano-ZnO)复合材料的非等温结晶行为,并探讨了基于Avrami方程和莫志深方程的结晶动力学,最后利用Flynn-Wall-Ozawa方程计算了纯PP和PP/nano-ZnO复合材料非等温结晶过程中的活化能(ΔE)。结果表明,PP中加入nano-ZnO后,复合材料的结晶起始温度(To)和结晶峰值温度(Tp)均有所提高;与纯PP相比,复合材料的半结晶时间(t1/2)和结晶速率[F(T)]升高,而结晶速率常数(Zc)降低;随着nano-ZnO含量的增加,复合材料的结晶速率先增加后减小;PP/nano-ZnO复合材料的活化能随nano-ZnO含量的增加而降低。

Non-isothermal crystallization behaviors of PP/nano-ZnO （PZ） composites were investigated by DSC. The non-isothermal crystallization kinetics was analyzed by Avrami and Mo methods. The effective activation energy （AE） of both neat PP and PP/nano-ZnO composite was calculated from Flynn-Wall-Ozawa equation. The results showed that the crystallization onset temperature （ T0 ） and crystallization temperature （Tp） of PZ composites increased compared to neat PP. Moreover, the crystallization rate （Zc） of PZ composites decreased by the addition of nano-ZnO, but the half-time of crystallization （t~/2 ） and F （T） increased. The crystallization rate of PZ composites increased when nano-ZnO content increased, then gradually decreased. For the composites, AE of PP/nano-ZnO composite was decreased with increasing the nano-ZnO content.