Wang Xiulei, Wu Gaojian, Xie Pengcheng, Gao Xiaodong, Yang Weimin
College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.
Polymers (Basel). 2020 Oct 15;12(10):2368. doi: 10.3390/polym12102368.
The automobile and aerospace industries require lightweight and high-strength structural parts. Nylon-based microcellular foamed composites have the characteristics of high strength and the advantages of being lightweight as well as having a low production cost and high product dimensional accuracy. In this work, the glass fiber-reinforced nylon foams were prepared through microcellular injection molding with supercritical fluid as the blowing agent. The tensile strength and weight loss ratio of microcellular foaming composites with various injection rates, temperatures, and volumes were investigated through orthogonal experiments. Moreover, the correlations between dielectric constant and injection volume were also studied. The results showed that the "slow-fast" injection rate, increased temperature, and injection volume were beneficial to improving the tensile strength and strength/weight ratios. Meanwhile, the dielectric constant can be decreased by building the microcellular structure in nylon, which is associated with the weight loss ratio extent closely.
汽车和航空航天工业需要轻质且高强度的结构部件。尼龙基微孔泡沫复合材料具有高强度的特性，同时具备轻质、生产成本低以及产品尺寸精度高的优点。在这项工作中，以超临界流体作为发泡剂，通过微孔注射成型制备了玻璃纤维增强尼龙泡沫。通过正交实验研究了不同注射速率、温度和体积下微孔发泡复合材料的拉伸强度和失重率。此外，还研究了介电常数与注射体积之间的相关性。结果表明，“慢-快”注射速率、升高温度以及增大注射体积有利于提高拉伸强度和强度/重量比。同时，通过在尼龙中构建微孔结构可以降低介电常数，这与失重率程度密切相关。
