Fiber orientation propelled by high-pressure water penetration in water-assisted injection molded fiber-reinforced thermoplastics part

Fiber orientation propelled by high-pressure water penetration in water-assisted injection molded fiber-reinforced thermoplastics part
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水辅助注塑纤维增强热塑性塑料部件中高压水渗透推动的纤维取向

DOI:
10.1177/0021998312438083
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发表时间:
2013-01
影响因子:
2.9
通讯作者:
Run-Heng Zhou
Run-Heng Zhou
中科院分区:
材料科学3区
文献类型:
--
作者:
Han-Xiong Huang;Can Yang;Run-Heng Zhou

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研究了水辅助注射成型(WAIM)纤维增强聚丙烯制品厚度方向上的纤维取向模式,并借助熔体充模和高压水渗透过程中模腔内独特的剪切速率场和冷却速率场解释了其形成机理。研究发现,WAIM制品中有序区的相对厚度远大于常规注塑制品中的有序区的相对厚度。在靠近进水口的位置,纤维沿流向从靠近模壁的区域向靠近水道的区域沿着越来越少;而在靠近水道末端的位置,几乎不存在无序区域。较高的水压和较低的熔体温度导致更多的纤维沿沿着流动方向取向。更重要的是,高压水渗透可以显著地促进WAIM纤维增强部件中的纤维取向,这可以改善其力学性能。
Fiber orientation pattern across the thickness of water-assisted injection molded (WAIM) fiber-reinforced polypropylene part was investigated and its formation mechanism was interpreted with the aid of unique shear rate and cooling rate fields within mold cavity under melt filling and high-pressure water penetration. It was found that the relative thickness of ordered region in WAIM part is much larger than that in conventional injection molded part. At the position near water inlet, less and less fibers arrange along flow direction from the area near mold wall to the one near water channel; whereas at the position near the end of water channel, almost no disordered region exists. Higher water pressure and lower melt temperature result in more fibers orienting along flow direction. More importantly, high-pressure water penetration can remarkably propel the fiber orientation in WAIM fiber-reinforced parts, which may improve their mechanical properties.
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