Hygrothermal properties and micro morphology of graphene oxide modified carbon fiber/epoxy resin composites
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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GO-CF/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。Abstract: 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 GO-CF/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.
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Key words:
- graphene oxide /
- carbon fiber /
- resin matrix composites /
- hygrothermal properties /
- micro morphology
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图 3 不同GO含量的GO-CF/EP复合材料的层间剪切强度(a)、层间剪切强度保持率(b)、室温干态时的行程-载荷曲线(c)及湿热处理后的行程-载荷曲线(d)
Figure 3. Interlaminar shear strength (a), interlaminar shear strength retention (b), stroke-load curves in normal state (c) and stroke-load curves after hygrothermal treatment (d) of GO-CF/EP composites with different content of GO
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