氧化石墨烯改性碳纤维/环氧树脂复合材料的湿热性能及微观形貌  

Hygrothermal properties and micro morphology of graphene oxide modified carbon fiber/epoxy resin composites

作　　者：刘文军 严建龙 周川 李伟东 周玉敬 邱虹[1] 白华[1] 胡晓兰[1] Wenjun LIU;Jianlong YAN;Chuan ZHOU;Weidong LI;Yujing ZHOU;Hong QIU;Hua BAI;Xiaolan HU(College of Materials,Xiamen University,Xiamen 361005,China;National Key Laboratory of Advanced Composites,AVIC Composite Technology Center,AVIC Composite Corporation Ltd.,Beijing 101300,China;State Key Laboratory of Advanced Forming Technology&Equipment,Beijing Jike Guochuang Lightweight Science Research Institute Co.Ltd.,Beijing 100083,China)

机构地区：[1]厦门大学材料学院,厦门361005 [2]中航复合材料有限责任公司航空工业复合材料技术中心先进复合材料重点实验室,北京101300 [3]北京机科国创轻量化科学研究院有限公司先进成型技术与装备国家重点实验室,北京100083

出　　处：《复合材料学报》2021年第5期1416-1425,共10页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(21774104;21975210);国防基础科研计划(JCKY2017205C016)。

摘　　要：采用湿法预浸技术和模压工艺制备了氧化石墨烯(GO)改性碳纤维/环氧树脂(CF/EP)复合材料,研究了GO在室温干态及湿热处理后对CF/EP复合材料动态热力学性能和层间剪切性能的影响,并通过微观形貌分析了复合材料的改性机制。结果表明,当GO添加量分别为0.5%和0.8%时,GO-CF/EP复合材料的玻璃化转变温度(Tg)得到明显提高,由CF/EP复合材料的184.4℃分别提高到197.7℃和199.5℃;GO-CF/EP复合材料经湿热处理后,GO-CF/EP复合材料的Tg的保持率比CF/EP略低。GO添加量分别为0.05%和0.1%时,GO-CF/EP复合材料的层间剪切强度由CF/EP复合材料的59.7 MPa分别提高到70.2 MPa和72.2 MPa;GO-CF/EP复合材料进行湿热处理后,GO添加量为0.05%的GO-CF/EP复合材料和GO添加量为0.1%的GOCF/EP复合材料层间剪切强度较CF/EP复合材料高,但GO-CF/EP复合材料的湿热后层间剪切强度保持率均低于CF/EP复合材料。力学损耗分析表明,GO有效提高了CF与EP基体间的界面黏结作用。微观形貌分析表明,GO的存在可有效分散裂纹能量并使裂纹发生偏转,使GO-CF/EP复合材料抵抗裂纹扩展的能力提高。Graphene oxide(GO) modified carbon fiber/epoxy resin(CF/EP) composites were prepared by wet prepreg technology and molding process. The effects of GO on dynamic mechanical properties and interlaminar shear properties of the GO-CF/EP composites at room temperature and hygrothermal environment were studied.Micro morphology was used to analyze modification mechanism of the GO-CF/EP composites. The results show that when the addition amount of GO are 0.5% and 0.8%, respectively, the glass transition temperature(Tg) of the GO-CF/EP composites are significantly increased from 184.4℃ of the CF/EP composites to 197.7℃ and 199.5℃, respectively. After hygrothermal treatment, Tg retention rate of the GO-CF/EP composites is slightly lower than that of the CF/EP composites. The interlaminar shear strength of GO-CF/EP composite with GO content of 0.05% and GOCF/EP composite with GO content of 0.1% are increased from 59.7 MPa of the CF/EP to 70.2 MPa and 72.2 MPa, respectively. The interlaminar shear strength after hygrothermal treatment of GO-CF/EP composite with GO content of 0.05% and GO-CF/EP composite with GO content of 0.1% are improved compared to the CF/EP composite. And the interlaminar shear strength retention rates of the GO-CF/EP composites before and after hygrothermal treatment are all lower than the CF/EP composite. Dynamic mechanical loss analysis of the composites shows that GO effectively improves the interface bonding between CF and EP matrix. Micro morphology shows that the existence of GO improves the ability of GO-CF/EP composites to resist crack growth.

关 键 词：氧化石墨烯 碳纤维 树脂基复合材料 湿热性能 微观形貌 

分 类 号：TB332[一般工业技术—材料科学与工程]