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J. Martinez Salazar R. K. Bayer T. A. Ezquerra F. J. Baltá Calleja 《Colloid and polymer science》1989,267(5):409-413
The morphology and structure of high molecular weight linear polyethylene (M
w 450000) filled with carbon black and processed using molds that introduce an elongational flow component during injection molding has been examined using electron microscopy and x-ray diffraction techniques. The study of fracture surfaces reveals the display of shish-kebabs oriented along the injection direction with segregated longitudinal channels of carbon black particles. Molecular and lamellar changes in orientation are, furthermore, studied across the thickness of the moldings. It is shown that addition of carbon black particles to injection-molded polyethylene induces significant changes in lamellar orientation. Thus, while lamellar overgrowth proceeds perpendicular to the fiber axes within carbon free channels, lamellae grow randomly within carbon-enriched regions where flow is less pronounced. 相似文献
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Hui-Juan Huang Bang-Hu Xie Wei Yang Yue-Xin Shen Ming-Bo Yang 《Journal of Macromolecular Science: Physics》2013,52(2):231-241
The influence of polyolefin elastomer (POE) content on the fracture behavior of injection-molded polypropylene (PP)/POE blends was evaluated by means of the essential work of fracture (EWF) method. The results indicated that the EWF approach worked well for the PP/POE blends when POE content was 0~7.5 wt% of the blends. The specific essential work of fracture (w e) increased with increasing POE content, and the dominant factor that affected w e was the necking and subsequent fracture process. The specific nonessential work of fracture (βw p) slightly decreased with increasing POE content, while the specific plastic work (w p) showed an increasing trend with the decrease of the shape factor (β) of the specimen. Finally, it was shown that w e could be predicted reasonably well via the COD values. 相似文献
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Level Set追踪等温非牛顿熔全前沿界面 总被引:1,自引:0,他引:1
应用Level Set方法追踪薄壁型腔内Hele-Shaw熔体流动前沿界面,采用5阶加权本质无振荡格式耦合中心差分格式实现了充填阶段的动态模拟.准确追踪到了不同时刻熔体前沿界面,并得到了对应的压力等值线分布,数值结果表明Level Set方法是准确追踪注塑成型熔体前沿界面的一种行之有效的方法. 相似文献
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