Effects of 3-aminophenylacetylene on mechanical properties at elevated temperatures of carbon fiber/phthalonitrile composites. (April 2020)

• Record Type: Journal Article
• Authors: Sun, Bao-Gang; Shi, Han-Qiao; Yang, Kun-Xiao; Lei, Qin; Li, Yuan-Qing; Fu, Ya-Qin; Hu, Ning; Guo, Ying; Zhou, Heng; Fu, Shao-Yun
• Is Part Of: Composites communications. Volume 18(2020)
• Page Start: 55
• Page End: 61
• Publication Date: 2020-04
• Subjects: Phthalonitrile resin -- Composites -- Heat resistance -- Processability -- Mechanical properties
• DOI: 10.1016/j.coco.2020.01.007
• Languages: English
• ISSNs: 2452-2139

Abstract

Abstract: High temperature mechanical properties are crucial for successful application of carbon fiber (CF) reinforced composites in aerospace engineering field etc. Here CF reinforced composites based on our own developed phthalonitrile blend (APN10) modified by 3-aminophenylacetylene (APA) were prepared by Resin Transfer Molding (RTM) process. The effects of 3-aminophenylacetylene (APA) addition were studied on the composite mechanical properties at elevated temperatures. The results show that the processability of CF/phthalonitrile composites is greatly improved by the addition of APA. The RTM processing window as wide as 3 h at 150 °C is achieved when 10 wt% APA is added to the phthalonitrile resin blend. Meanwhile, the 5% weight loss temperature (Td5 ) of the as-prepared composites is higher than 550 °C and the glass transition temperature (Tg ) of the composites is higher than 530 °C, exhibiting excellent thermal stability. In particular, the addition of APA can significantly enhance the mechanical properties at high temperatures of the CF/phthalonitrile composites. The retentions of flexural strength, flexural modulus and interlaminar shear strength at elevated temperatures (400 °C and 500 °C) of the as-prepared CF composites with proper contents of APA are relatively higher than those of the previously reported heat-resistant composites based on phthalonitrile resins. The roles of the short molecule length and catalysis of APA at high temperatures are analysed in the high mechanical retentions at elevated temperatures of the CF/phthalonitrile composites. Graphical abstract: Image 1 Highlights: Carbon fiber/3-aminophenylacetylene (APA)-modified phthalonitrile composites withexcellent RTM processability have been developed. The composites show excellent thermal properties with Tg higher than 530 °C and Td5 higher than 550 °C in N2 . The addition of APA has evidently enhanced the mechanical properties at high temperature of the composites.