碳纳米管对聚合物及其复合材料蠕变性能的影响

发布时间：2018-05-29 02:51

本文选题：CNTs + 环氧树脂基体　；参考：《国防科学技术大学》2015年硕士论文

【摘要】：聚合物基复合材料具有比金属基、陶瓷基复合材料更大的蠕变特性,限制了其在高尺寸稳定性要求结构件中的使用。本文采用碳纳米管(CNTs)为聚合物增强体,以环氧树脂基体为研究对象,考察了CNTs的含量、表面官能团对环氧树脂拉伸蠕变性能的影响,并通过动态力学性能实验表征其玻璃化转变温度和特征频率。本文测试了不同温度下环氧树脂浇铸体的拉伸蠕变性能,通过时间-温度等效原理,构建了CNTs/环氧树脂复合材料的蠕变主曲线,预测了CNTs/环氧树脂复合材料的长期蠕变特性。本文还研究了CNTs与碳纤维共同增强环氧树脂复合材料的蠕变特性,考察未改性CNTs和氨基改性CNTs对T700/E-51复合材料弯曲蠕变性能的影响规律。结果表明,CNTs都能够提高环氧树脂浇铸体的拉伸模量,并显著降低环氧树脂的蠕变应变;但环氧树脂浇铸体的玻璃化转变温度有所降低,含氨基改性CNTs的环氧树脂的玻璃化转变温度较高。通过主曲线拟合方程预测纯环氧树脂及CNTs/环氧浇铸体1年内的蠕变应变分别为1.44%和1.15%,即CNTs的加入使环氧树脂1年内的蠕变应变降低了20.14%。
[Abstract]:Polymer matrix composites have more creep properties than metal and ceramic matrix composites, which limit their use in structural parts with high stability requirements. In this paper, the effects of CNTs content and surface functional groups on the tensile creep properties of epoxy resin were investigated by using carbon nanotubes (CNTs) as polymer reinforcements and epoxy resin matrix as the research object. The glass transition temperature and characteristic frequency were characterized by dynamic mechanical properties. In this paper, the tensile creep properties of epoxy resin castings at different temperatures were tested. The creep principal curve of CNTs/ epoxy resin composites was constructed by time-temperature equivalence principle, and the long-term creep characteristics of CNTs/ epoxy resin composites were predicted. The creep properties of epoxy resin composites reinforced by CNTs and carbon fiber were studied, and the effects of unmodified CNTs and amino modified CNTs on the flexural creep properties of T700/E-51 composites were investigated. The results show that CNTs can increase the tensile modulus and decrease the creep strain of epoxy resin, but the glass transition temperature of epoxy resin cast is decreased. The glass transition temperature of epoxy resin containing amino modified CNTs is higher. The creep strain of pure epoxy resin and CNTs/ epoxy casting was predicted to be 1.44% and 1.15% respectively in one year by main curve fitting equation. That is to say, the creep strain of epoxy resin was reduced by 20.14% with the addition of CNTs in one year.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332;TQ327

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