界面应力对HDPE/CaCO_3增韧体系基体结晶动力学影响的研究

EFFECTS OF THE INTERFACIAL STRESS OF HDPE/CaCO_3 BLENDS IN COOLING PROCESS ON THEIR CRYSTALLIZATION KINETICS

采用了一种可表征体系冷却收缩应力对聚合物结晶影响的动力学方法 ,研究了不同冷却速率条件下 HDPE/ Ca CO3增韧体系的基体结晶动力学行为及其与材料界面相粘结性及 Ca CO3含量之间的关系。结果表明 ,在材料缺口冲击强度较高的界面相粘结及组成条件下 ,体系熔体冷却收缩过程中所引起的界面应力的应变诱导结晶作用引起了基体晶体生长指数 n1、生长速率常数 k1及其 k1随冷却速率 a的变化率Δk1/Δa的显著增大 ;

In this paper, the crystallization behaviors of HDPE/CaCO 3 blends and their dependence on the interfacial adhesion and CaCO 3 content were investigated with a new kinetic method, by which the effects of cooling shrinkage stress on the crystallization can be characterized. The results show that under the better interfacial adhesion and component conditions, the interfacial stress produced from the matrix shrinkage in cooling process can strain induce and accelerate the crystallization of the matrix, leading to the increase of the crystallization growth index ( n 1), the growth rate constant ( k 1) and the changing rate of the k 1 over the cooling rate a (Δ k 1/Δ a ). It was found that there is a good consistency between the varying regulations of the crystallization kinetic parameters and the Charpy impact strength of the blends.