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首页> 外文期刊>Macromolecular symposia >Effect of Multiple Extrusion on Impact Fracture of Three Poly(propylene) Impact Copolymers
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Effect of Multiple Extrusion on Impact Fracture of Three Poly(propylene) Impact Copolymers

机译：多次挤出对三种聚丙烯（丙纶）抗冲共聚物冲击断裂的影响

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The effect of structural changes induced by multiple extrusion on the impact fracture behavior of three reactor poly(propylene) impact-copolymers (ICPPs) was investigated. The morphogenesis of the complex ICPP structure was controlled by the competition between the intraspherulitic phase separation and crystallization. The rubbery inclusion size was controlled by the rate of spinodal decomposition at the onset of crystallization. The following fast spherulite growth fixed the size and spatial distribution of these inclusions. The Charpy notched impact strength (a_k) and critical strain energy release rate (G_c) measured under impact loading decreased significantly with the number of extruder passes. A measurable reduction of the size of the crack tip plastic zone (R_p) with the number of extruder passes was observed using high speed digital camera. While the melt flow index (MFI) dependence of ak exhibited ICPP specific shape, the MFI dependences of Gc fell on a single master curve at both 23 and -20℃.
机译：研究了多次挤出引起的结构变化对三种反应器聚丙烯（丙稀）抗冲共聚物（ICPP）的冲击断裂行为的影响。复杂的ICPP结构的形态发生是由球内相分离和结晶之间的竞争控制的。橡胶状夹杂物的大小由结晶开始时的节线形分解速率控制。随后的球晶快速生长固定了这些夹杂物的大小和空间分布。冲击载荷下测得的夏比缺口冲击强度（a_k）和临界应变能释放速率（G_c）随着挤出机通过次数的增加而显着降低。使用高速数码相机观察到，随着挤出机通过次数的出现，裂口尖端塑性区（R_p）的尺寸可测量地减小。 ak的熔体流动指数（MFI）依赖性表现出ICPP特定形状，而Gc的MFI依赖性在23和-20℃时均下降到一条主曲线上。

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