Process comparison on the microstructure and mechanical properties of fiber-reinforced polyphenylene sulfide using MuCell technology
Process comparison on the microstructure and mechanical properties of fiber-reinforced polyphenylene sulfide using MuCell technology
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DOI：
10.1177/0731684418777120
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发表时间：
2018-05
影响因子：
3.1
通讯作者：
C. Lohr;B. Beck;F. Henning;K. Weidenmann;P. Elsner
中科院分区：
文献类型：
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作者：
C. Lohr;B. Beck;F. Henning;K. Weidenmann;P. Elsner
MuCell 工艺是一种特殊的注塑工艺，利用超临界气体（氮气）来制造整体泡沫夹层。优点是重量更轻、特定性能更高、循环时间更短。在这项研究中，采用 MuCell 注塑工艺制造了一系列玻璃纤维增强聚苯硫醚泡沫坯料。使用不同的工艺变体（低压也称为结构泡沫注射成型）和高压泡沫注射成型（也称为“芯部回膨胀”、“呼吸模具”、“精密开口”、减压成型）。对微孔和玻璃纤维增强聚苯硫醚泡沫的夹层结构和机械性能（拉伸强度、弯曲强度和冲击行为）进行了系统研究，并与致密材料进行了比较。结果表明，注射参数（注射速度、发泡机理）对微孔聚苯硫醚泡沫的相对密度和力学性能起着重要作用。可以看出，当发泡度增加时，比拉伸强度下降，这可以通过泡孔数量和由此产生的泡孔尺寸的增加来解释。这会导致应力峰值，从而降低机械性能。夏比冲击强度显示出对纤维取向的显着依赖性。然而，高压发泡工艺的比弯曲模量超过了其他两种工艺的值，显示了这种制造变化的潜力，特别是在弯曲载荷方面。此外，可以发现机械性能对测试样品的纤维取向的高度依赖性。
The MuCell process is a special injection molding process which utilizes supercritical gas (nitrogen) to create integral foam sandwiches. The advantages are lower weight, higher specific properties and shorter cycle times. In this study, a series of glass fiber-reinforced polyphenylene sulfide foam blanks are manufactured using the MuCell injection molding process. The different variations of the process (low-pressure also known as structural foam injection molding) and high-pressure foam injection molding (also known as “core back expansion,” “breathing mold,” “precision opening,” decompression molding) are used. The sandwich structure and mechanical properties (tensile strength, bending strength, and impact behavior) of the microcellular and glass fiber-reinforced polyphenylene sulfide foams are systematically investigated and compared to compact material. The results showed that the injection parameters (injection speed, foaming mechanism) played an important role in the relative density of microcellular polyphenylene sulfide foams and the mechanical properties. It could be shown that the specific tensile strength decreased while increasing the degree of foaming which can be explained by the increased number of cells and the resulting cell size. This leads to stress peaks which lower the mechanical properties. The Charpy impact strength shows a significant dependence on the fiber orientation. The specific bending modulus of the high-pressure foaming process, however, surpasses the values of the other two processes showing the potential of this manufacturing variation especially with regard to bending loads. Furthermore, a high dependence of the mechanical properties on the fiber orientation of the tested specimens can be found.