Study on the macro- and micro-mechanical properties of quartz fiber reinforced polyimide resin matrix composite after thermal aging

被引：0
|
作者：
Chen, Xiaofei [1 ]
Liu, Haitao [1 ]
Jiang, Ru [2 ,3 ]
Bai, Huizhen [4 ]
机构：
[1] Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha,410073, China
[2] School of Physics and Electronic Science, Hunan University of Science and Technology, Xiangtan,411021, China
[3] Key Laboratory of Intelligent Sensors and Advanced Sensing Materials of Hunan Province, Hunan University of Science and Technology, Xiangtan,411021, China
[4] Electronic Countermeasure Institute, National University of Defense Technology, Hefei,230037, China
来源：
Composite Structures | 2022年 / 292卷
关键词：
Evolution mechanism - Fibre-reinforced - matrix - Micromechanical property - PI composite - Polyimide resin - Polyimide resin matrix composite - Quartz fibers - Reinforced polyimides - Resin matrix composites;
D O I：
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中图分类号：
学科分类号：
摘要：
In this work, the polyimide resin (YH-550) with high glass transition temperature (∼403 °C) was selected as the matrix, and the quartz fiber reinforced polyimide resin matrix (SiO2f/PI) composite was prepared by prepreg hot pressing method. In order to obtain the evolution mechanism of macro- and micro- mechanical properties of the SiO2f/PI composite after thermal aging, the composite was first subjected to thermal aging at 250 °C and 350 °C for 100 h (SiO2f/PI-250 °C, SiO2f/PI-350 °C) in air, respectively. And then the as-received SiO2f/PI, SiO2f/PI-250 °C and SiO2f/PI-350 °C composite was tested by SEM, macro-mechanics, nano-mechanics and XPS. Thus, the macro- and micro- mechanical properties of the SiO2f/PI composite were constructed. The results show that the SiO2f/PI-250 °C composite still has excellent mechanical properties. However, the flexural strength of SiO2f/PI-350 °C composite decreases remarkably (∼227.7 MPa). The in-situ modulus of fiber and matrix in as-received SiO2f/PI, SiO2f/PI-250 °C and SiO2f/PI-350 °C composite do not change significantly, but interfacial shear strength (IFSS) changes greatly, which are 106.7 ± 2.0 MPa, 97.0 ± 8.3 MPa and 14.7 ± 0.7 MPa, respectively. Based on the basic mechanical theory of composites, it is concluded that the decrease of IFSS is the fundamental reason for mechanical properties degradation of SiO2f/PI-350 °C composite, and the interface evolution mechanism of the composite was discussed. © 2022 Elsevier Ltd
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