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首页> 外文会议>International Conference on Polymer Processing(ICPP 2007); 20070518-20; Beijing(CN) >Simulation of the Fiber Orientation of Kevlar in SPS/Kevlar Composites- Effect of Fluorination and Oxy-fluorination of Kevlar Fiber on the Properties and Processibility
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Simulation of the Fiber Orientation of Kevlar in SPS/Kevlar Composites- Effect of Fluorination and Oxy-fluorination of Kevlar Fiber on the Properties and Processibility

机译：SPS / Kevlar复合材料中芳纶纤维取向的模拟-芳纶纤维的氟化和氧氟化对性能和可加工性的影响

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摘要

The Kevlar fiber was fluorinated and oxy-fluorinated directly in presence of fluorine and blended with SPS at 300℃ under 10 rpm in a twin-screw extruder. The composites were then injection molded into dumbbell shaped specimens under different conditions like various mold temperatures,injection temperatures, injection speeds and mold filling rates. Various physico-chemical characterizations of the composites have been done and effect of all the processing parameters and the chemical modifications were studied. The properties were correlated with the fiber orientations that have been computer simulated by mold flow technique. It has been found out that the processibility differ widely with the variation of processing parameters during injection molding. The orientations are different in the skin and core region, which once again affects the flow behavior. The bulk technical properties were found to be the function of the fiber orientations in skin and the core of the injection molded samples. The enhanced mechanical property are also observed in case of modified composites resulting better fiber/matrix interaction at the interface due to the incorporation of the functional groups onto the Kevlar surface. Scanning electron microscopy reveals the better fiber/matrix adhesion in case of modified fiber reinforced syndiotactic polystyrene composites. It is worth mentioning that the maximum fiber orientation occurred during the extrusion process at the wall but different extent of fiber orientation is obserbed during the injection moulding depending on the shape of the dumbbell specimen.
机译：将凯夫拉尔纤维直接在氟存在下进行氟化和氧氟化，然后在双螺杆挤出机中于300℃，10 rpm下与SPS混合。然后将复合材料在不同条件下（例如各种模具温度，注射温度，注射速度和模具填充速率）注射成型为哑铃状样品。对复合材料进行了各种物理化学表征，并研究了所有工艺参数和化学改性的影响。这些性质与通过模流技术计算机模拟的纤维取向相关。已经发现，随着注塑成型过程中加工参数的变化，加工性能差异很大。皮肤和核心区域的方向不同，这再次影响流动行为。发现主要的技术性能是皮肤中纤维取向和注塑样品核心的函数。在改性复合材料的情况下，由于官能团结合到凯夫拉尔表面上，导致在界面处更好的纤维/基体相互作用，也观察到增强的机械性能。扫描电子显微镜显示，在改性纤维增强间规聚苯乙烯复合材料的情况下，纤维/基体的粘合性更好。值得一提的是，最大的纤维取向发生在挤压过程中的壁上，但是在注射成型过程中会观察到不同程度的纤维取向，这取决于哑铃试样的形状。

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