Zheng Liu#, Xuerong Fan#, Xinghan Lu, Xuetao Shi*, Junliang Zhang, Hua Guo, Mukun He and Junwei Gu*. Interface strengthening for carbon fiber-reinforced poly(ether-ether-ketone) laminated composites by introducing fluorene-containing branched poly(aryl-ether-ketone). Interdisciplinary Materials, 2024, DOI: 10.1002/idm2.12200. 2023IF=24.5.（中國科技期刊卓越行動計劃-高起點新刊）
https://doi.org/10.1002/idm2.12200
Abstract
Fluorene-containing branched poly(aryl-ether-ketone) (BFPAEK) with terminal hydroxyl groups is synthesized by random co-polycondensation reaction, and then the CF@BFPAEK/PEEK laminated composite is prepared by the "powder impregnation-high temperature compression molding" method with poly(ether-ether-ketone) (PEEK) as the matrix and BFPAEK modified carbon fiber (CF@BFPAEK) as the reinforcement. When the content of branched units in BFPAEK is 10% and the coating amount of BFPAEK on the CF surface is 3 wt%, the CF@BFPAEK/PEEK laminated composite has the outstanding mechanical properties, with the interlaminar shear strength (ILSS) of 57.3 MPa and flexural strength of 589.4 MPa, which are 80.2% and 44.3% higher than those of the pure CF/PEEK laminated composite (31.8 MPa and 408.4 MPa), respectively. After 288 hours of hydrothermal aging and high/low temperature alternating aging, the corresponding retention rate of ILSS and flexural strength are respectively 87.9% and 84.7%, higher than those of pure CF/PEEK laminated composites (74.5% and 70.4%). The thermal conductivity coefficient and temperature for 5% weight loss of CF@BFPAEK/PEEK laminated composite are 1.85 W/(m·K) and 538.0oC, respectively.
本文以雙酚芴、二氟二苯甲酮和間苯三酚為原料，采用三元無規共縮聚反應合成端羥基的含芴支化聚芳醚酮（BFPAEK）。以聚醚醚酮（PEEK）為基體、BFPAEK表面功能化改性的碳纖維（CF@BFPAEK）為增強體，經“粉末浸漬-高溫模壓”成型制備CF@BFPAEK/PEEK層壓復合材料。核磁共振波譜（NMR）、傅里葉變換紅外光譜（FT-IR）和體積排除色譜（SEC）證明成功合成出具有預期分子結構的BFPAEK。BFPAEK分子結構中的芴基和端羥基能夠通過π-π共軛作用和氫鍵等次價鍵力增強其與CF間相互作用力；BFPAEK能夠與PEEK間相互擴散形成穩定界面層，改善PEEK基體與CF@BFPAEK間的界面粘接強度。當BFPAEK中支化單元的含量為10 wt%且在CF表面的包覆量為3 wt%時，CF@BFPAEK/PEEK層壓復合材料具有最佳的力學性能，優異的導熱性能和熱穩定性。其層間剪切強度（ILSS）和彎曲強度分別為57.3 MPa和589.4 MPa，較純CF/PEEK層壓復合材料（31.8 MPa和408.4 MPa）分別提升了80.2%和44.3%。經288小時的水熱老化和高低溫交變老化后仍具有優異的力學性能，ILSS和彎曲強度保持率分別為87.9%和84.7%，也明顯高于純CF/PEEK層壓復合材料的74.5%和70.4%。CF@BFPAEK/PEEK層壓復合材料的導熱系數和5%熱失重溫度分別為1.85 W/(m·K)和538.0oC。
論文亮點
1. BFPAEK的起始熱分解溫度為404.1oC，能滿足CF/PEEK層壓復合材料成型過程中的加工溫度要求。
2. BFPAEK通過π-π共軛作用和氫鍵等次價鍵力增強CF與PEEK樹脂間的界面作用力，同步提升了CF@BFPAEK/PEEK層壓復合材料的力學性能、導熱性能和熱穩定性能。
3. CF@BFPAEK/PEEK層壓復合材料的ILSS和彎曲強度分別較純CF/PEEK層壓復合材料提升了80.2%和44.3%，其導熱系數和5%熱失重溫度分別為1.85 W/(m·K)和538.0oC。
第一作者：劉政郵件地址：npuliuzheng@163.com
共同第一作者：范學蓉郵件地址：npufanxuerong@163.com
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