The Effect of the Melt Viscosity and Impregnation of a Film on the Mechanical Properties of Thermoplastic Composites.
The Effect of the Melt Viscosity and Impregnation of a Film on the Mechanical Properties of Thermoplastic Composites.
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DOI：
10.3390/ma9060448
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发表时间：
2016-06-03
期刊：
影响因子：
--
通讯作者：
Lee JS
中科院分区：
文献类型：
--
作者：
Kim JW;Lee JS
通常，为了生产具有良好机械性能的薄膜型热塑性复合材料，需要使用高性能增强薄膜。在这种情况下，用作基质的薄膜由于其高熔体粘度和高分子量而难以浸渍到丝束中。为了解决这个问题，本文分别使用三种不同熔体粘度的聚丙烯（PP）薄膜来生产薄膜型热塑性复合材料。堆叠具有低熔体粘度的薄膜，使得首先浸渍丝束，然后堆叠具有较高熔体粘度的薄膜以生产复合材料。通过调节压力上升时间生产四种不同的复合材料。分析厚度、密度、纤维体积分数 (Vf) 和空隙含量 (Vc)，以确定物理性能并根据薄膜堆叠类型进行比较。通过使用差示扫描量热法（DSC）和动态机械热分析（DMTA）来确定热性能。通过拉伸性能、弯曲性能、层间剪切强度（ILSS）和扫描电子显微镜（SEM）来鉴定机械性能。对于低分子量的薄膜，浸渍可以快速完成，但强度较低。此外，高分子量的薄膜浸渍完成缓慢，但表现出高强度。因此，应考虑成型工艺时间及其机械性能，使用合适的薄膜来生产薄膜型复合材料。
Generally, to produce film-type thermoplastic composites with good mechanical properties, high-performance reinforcement films are used. In this case, films used as a matrix are difficult to impregnate into tow due to their high melt viscosity and high molecular weight. To solve the problem, in this paper, three polypropylene (PP) films with different melt viscosities were used separately to produce film-type thermoplastic composites. A film with a low melt viscosity was stacked so that tow was impregnated first and a film with a higher melt viscosity was then stacked to produce the composite. Four different composites were produced by regulating the pressure rising time. The thickness, density, fiber volume fraction (Vf), and void content (Vc) were analyzed to identify the physical properties and compare them in terms of film stacking types. The thermal properties were identified by using differential scanning calorimetry (DSC) and dynamical mechanical thermal analysis (DMTA). The tensile property, flexural property, interlaminar shear strength (ILSS), and scanning electron microscopy (SEM) were performed to identify the mechanical properties. For the films with low molecular weight, impregnation could be completed fast but showed low strength. Additionally, the films with high molecular weight completed impregnation slowly but showed high strength. Therefore, appropriate films should be used considering the forming process time and their mechanical properties to produce film-type composites.