芳纶纤维与树脂基体改性对复合材料剪切性能的影响
Effect of Modification of Aramid Fiber and Resin Matrix on Shear Properties of Composites
梁起睿 1叶金蕊 2颜丙越 3刘凯 2何剑飞 3姬晓龙 2侯晓4
作者信息
- 1. 先进输电技术国家重点实验室,北京 102209;沈阳建筑大学材料科学与工程学院,辽宁沈阳 110168;北京理工大学唐山研究院,河北唐山 063000
- 2. 北京理工大学宇航学院,北京 100081;北京理工大学唐山研究院,河北唐山 063000
- 3. 先进输电技术国家重点实验室,北京 102209
- 4. 北京理工大学宇航学院,北京 100081
- 折叠
摘要
芳纶纤维表面惰性会影响其与树脂间的浸润性能和界面结合强度,因此限制了芳纶纤维复合材料在航空、航天、输电等领域的应用.为了对比纤维表面改性和树脂基体改性技术对芳纶纤维复合材料层间剪切性能的影响,文中结合光学和力学测试方法对不同改性技术及处理过程对芳纶纤维表面刻蚀的影响机制开展了深入研究.结果表明,乙酸酐化学刻蚀会对芳纶纤维表面基团产生影响且增加表面粗糙度.热氧化刻蚀处理后表面粗糙度显著增加,具有明显"沟壑"状.然而,当乙酸酐化学刻蚀处理时间高于6h、热氧化刻蚀处理时间高于4 min时,纤维内部结构就会受到损伤,导致复合材料层间剪切性能降低.超声浸渍改性处理后,纤维表面粗糙度有一定增加,纤维表面附着的气体将会排出,超过20 min后改性效果趋于稳定.使用偶联剂改性树脂基体可以增加纤维表面的键合作用,当添加量超过3%时,树脂分子间的过度交联导致复合材料层间剪切性能下降.研究结果为提高芳纶复合材料浸润性能和界面强度提供了理论依据,对航空航天、电力系统中芳纶复合材料设计及制造研究具有参考价值.
Abstract
The surface inertness of aramid fiber will affect the wetting property and interface bonding strength between aramid fiber and resin,so the application of aramid fiber composite in aviation,aerospace,power transmission and other fields is limited.In order to compare the effects of fiber surface modification and resin matrix modification on the interlayer shear properties of aramid fiber composites,the effects of different modification techniques and treatment processes on the surface etching of aramid fiber were studied by combining optical and mechanical testing methods.The results show that acetic anhydride chemical etching can affect the surface groups of aramid fiber and increase the surface roughness.After thermal oxidation etching treatment,the surface roughness increases significantly,with obvious"gully"shape.However,when the chemical etching time of acetic anhydride is more than 6 h,and the thermal oxidation etching time is more than 4 min,the internal structure of the fiber is damaged,and the interlayer shear performance of the composite is reduced.After ultrasonic impregnation treatment,the surface roughness of the fiber increases to a certain extent,the gas attached to the fiber surface would be discharged,and the modification effect tends to be stable after more than 20 min.The use of coupling agent to modify the resin matrix can increase the bonding on the fiber surface.When the addition amount exceeds 3%,the excessive cross-linking between the resin molecules leads to the decrease of the interlayer shear performance of the composite.This paper provided a theoretical basis for improving the infiltration performance and interface strength of aramid composites,and has reference value for the design and manufacture of aramid composites in aerospace and power systems.
关键词
芳纶纤维表面改性/界面强度/树脂基体改性/微观形貌/浸润性能Key words
surface modification of aramid fiber/interface strength/resin matrix modification/microtopography/performance of infiltration引用本文复制引用
基金项目
先进输电技术国家重点实验室开放基金项目(GEIRI-SKL-2021-004)
出版年
2024
NETL
NSTL
万方数据