摘要
由于碳纤维(CF)的化学惰性,导致了CF和聚醚酮酮(PEKK)的界面结合较差,限制了碳纤维增强聚醚酮酮(CF/PEKK)复合材料力学性能的发挥。本文通过将国产PEKK树脂进行磺化处理制备了磺化聚醚酮酮(SPEKK)水性上浆剂,以改善CF/PEKK复合材料的力学性能。通过调控SPEKK的磺化度使其能够形成稳定的水性乳液,对CF进行上浆改性,并通过真空热压制备了CF/PEKK复合材料。研究发现,当水性SPEKK乳液的浓度为0.5wt%时,改性后的CF/PEKK复合材料的弯曲强度、弯曲模量和层间剪切强度分别达到了1237 MPa、78 GPa和92 MPa,比未改性的CF/PEKK复合材料分别提升了35.5%、5.4%和26.0%。CF/PEKK复合材料力学性能的改善,可能归因于在CF表面引入的SPEKK通过与CF产生氢键、π-π相互作用及与PEKK树脂基体形成π-π相互作用、分子间扩散和缠结等显著增强了CF与PEKK的界面结合。采用水性SPEKK上浆剂对碳纤维表面处理,不会产生环境污染,工艺更加简单,且适合于碳纤维的工业化生产,对于发展国产高性能碳纤维增强热塑性复合材料具有重要意义。
The interfacial interactions between carbon fiber(CF)and polyetherketoneketone(PEKK)are poor due to the chemical inertness of CF,limiting the mechanical properties of carbon fiber reinforced polyetherketoneketone(CF/PEKK)composites.In this study,a water-based sizing agent of sulfonated polyetherketoneketone(SPEKK)was prepared by sulfonating domestic PEKK resin,in order to improve the mechanical properties of CF/PEKK composites.By regulating the sulfonation degree,the stable SPEKK aqueous emulsion was obtained and used for CF sizing modification.Subsequently,CF/PEKK composites were fabricated via vacuum hotpress technique.When the concentration of SPEKK aqueous emulsion was 0.5wt%,the flexural strength,flexural modulus and interlaminar shear strength of the modified CF/PEKK composites reached 1237 MPa,78 GPa,and 92 MPa,which were 35.5%,5.4%,and 26.0% higher than that of the unmodified CF/PEKK composites,respectively.Such enhancement in mechanical properties could be attributed to the introduced SPEKK on the CF surfaces,which could form hydrogen bonds and π-π interactions with CF,as well asπ-πinteractions and diffusion and entanglement with PEKK,significantly promoting the interfacial bonding between CF and PEKK.As a simpler process,CF surface modification with water-based SPEKK sizing agent is environmentally friendly and suitable for the industrial production,which is of great significance for the development of domestic high-performance carbon fiber reinforced thermoplastic composites.
作者
杨雪勤
任宏亮
骆佳美
薛怿
陶铜鑫
刘勇
张辉
俞建勇
YANG Xueqin;REN Hongliang;LUO Jiamei;XUE Yi;TAO Tongxin;LIU Yong;ZHANG Hui;YU Jianyong(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China;Engineering Research Center of Technical Textiles,Ministry of Education,Donghua University,Shanghai 201620,China;Center for Civil Aviation Composites,Donghua University,Shanghai 201620,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2023年第11期6061-6072,共12页
Acta Materiae Compositae Sinica
基金
上海市科委“科技创新行动计划”项目子课题(22511102400)
中国商飞国家工程技术中心创新基金(COMAC-SFGS-2022-2376)
中国纺织工业联合会纺织之光应用基础研究项目(J202105)
“中央高校基本科研业务费专项资金”(2232023G-06)。
关键词
碳纤维/聚醚酮酮复合材料
磺化聚醚酮酮
水性上浆剂
界面改性
力学性能
carbon fiber/polyetherketoneketone composites
sulfonated polyetherketoneketone
water-based sizing agent
interfacial modification
mechanical properties
