Effects of ordered structure on non-isothermal crystallization kinetics and subsequent melting behavior of β-nucleated isotactic polypropylene/graphene oxide composites

In this paper, effects of ordered structure on non-isothermal crystallization kinetics and subsequent melting behavior of beta-nucleated isotactic polypropylene/graphene oxide composites were investigated. Under all cooling rates, as fusion temperature T-f stepped into the range of 168-178 degrees C, the ordered structure survived in the melt, resulting in the increase in crystallization peak temperature T-p, the decrease in crystallization activation energy Delta E and the decrease in the half crystallization time t(1/2). When endset temperature of cooling T-end=50 degrees C, lower cooling rate encouraged the formation of more -phase. Moreover, the influence of ordered structure on beta-alpha recrystallization was studied by adjusting the T-end. When T-end = 105 degrees C, higher cooling rate encouraged the formation of more beta-phase. The ordered structure was favorable for the improvement of the thermal stability of the beta-phase during beta-alpha recrystallization.