摘要
针对碳纤维/环氧树脂复合材料(CF/EP)在低温下易发生分层损伤破坏的问题,首先对热固性环氧树脂进行改性,制备了同体系的热塑性环氧树脂(TPE)颗粒,并将其应用于CF/EP层间进行增韧,与常用的聚酰胺66(PA66)颗粒子和聚醚砜(PES)颗粒进行对比,研究了3种颗粒对CF/EP在室温和低温时的增韧效果。试验结果表明,3种热塑性树脂颗粒均能起到显著的增韧效果,但添加颗粒后对CF/EP基本性能的影响有较大差异。CF/EP层间加入PA66颗粒和PES颗粒后,虽然复合材料韧性有一定提高,但由于树脂基体和增韧颗粒的体系差异,造成了复合材料层间增厚和基本力学性能的下降。而层间添加TPE颗粒的CF/EP层间断裂韧性显著提高,其室温下的Ⅱ型层间断裂韧性(GIIC)达到1126 J/m2,提高了88.0%;-183℃下的GIIC达到1386 J/m2,提高了109.2%,同时,TPE颗粒的加入对CF/EP层合板的厚度、室温与低温下的层间剪切强度和弯曲强度影响不大,这是由于TPE颗粒与预浸料中热固性环氧树脂属于同系材料,相互可以充分地融合流动,生成了更加独特的层间结构。因此,提出的同体系的TPE颗粒可以更全面有效地对复合材料进行室温和低温下的层间增韧。
To address the problem of delamination damage in Carbon Fiber/Epoxy Resin(CF/EP)composites at low temperatures,thermosetting epoxy resin was first modified to produce Thermoplastic Epoxy Resin(TPE)particles of the same system and were applied to toughen the interlayers of the CF/EP composite.The toughening results of these particles were compared at room and low temperatures with commonly used Polyamide 66(PA66)and Polyether Sulfone(PES)particles.While all three types of thermoplastic resin particles significantly improved toughness,their effects on the basic properties of CF/EP varied.The introduction of PA66 and PES particles increased the toughness of the composite but caused an increase in interlayer thickness and a decrease in basic mechanical properties due to the disparity between the resin matrix and the toughening particles.However,interlayer fracture toughness was significantly improved when TPE particles were added to the CF/EP interlayers,with ModeⅡinterlaminar fracture toughness(GIIC)at room temperature reaching 1126 J/m2,an increase of 88%,and GIIC at-183℃reaching 1386 J/m2,an increase of 109.2%.Thanks to the compatibility and sufficient fusion of TPE particles with the thermosetting epoxy resin in the prepreg,the addition of TPE particles did not significantly affect the thickness,interlaminar shear strength,and flexural strength of the CF/EP laminates at both room and low temperatures,resulting in a unique interlayer structure.Thus,the same system TPE particles proposed can more comprehensively and effectively toughen composites at both room and low temperatures.
作者
刘新
尹文轩
陈铎
侯永博
张露
武湛君
LIU Xin;YIN Wenxuan;CHEN Duo;HOU Yongbo;ZHANG Lu;WU Zhanjun(School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China;School of Mechanics and Aerospace Engineering,Dalian University of Technology,Dalian 116024,China;School of Materials,Zhengzhou University of Aeronautics,Zhengzhou 450046,China)
出处
《航空学报》
EI
CAS
CSCD
北大核心
2024年第16期271-281,共11页
Acta Aeronautica et Astronautica Sinica
基金
中央高校基本科研业务费(DUT22LAB114)
国家重点研发计划(2018YFA0702800,2022YFB3402500)
辽宁省自然科学基金(2022-MS-148)
关键词
热塑性环氧树脂颗粒
碳纤维/环氧树脂
层间增韧
低温韧性
剪切强度
弯曲强度
thermoplastic epoxy resin particles
carbon fiber/epoxy resin
interlaminar toughening
low-temperature toughness
shear strength
flexural strength
