胺/环氧当量比对MWCNTs-NH2/环氧树脂复合材料性能的影响

玻璃钢/复合材料 ›› 2016, Vol. 0 ›› Issue (5): 85-90.

胺/环氧当量比对MWCNTs-NH₂/环氧树脂复合材料性能的影响

唐峰²,张清杰^1*,高亮¹,吴剑桥¹

1.北京化工大学有机无机复合材料国家重点实验室,北京100029;
2.西安现代控制技术研究所,西安710065

收稿日期:2015-11-30 出版日期:2016-05-25 发布日期:2016-05-25
通讯作者: 张清杰(1986-),男,在读博士,主要从事碳纳米管改性及碳纤维/环氧树脂复合材料的研究,qingjie05110@163.com。
作者简介:唐峰(1968-),男,高级工程师,主要从事光纤制导与传感技术的研究。

EFFECTS OF THE EPOXY-AMINE STOICHIOMETRY RATIO ON THE PROPERTIESOF MWCNTs-NH₂/EPOXY COMPOSITES

TANG Feng², ZHANG Qing-jie^1*, GAO Liang¹, WU Jian-qiao¹

1.State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology,Beijing 100029, China;
2.Xi’an Modern Control Technology Research Institute, Xi’an 710065, China

Received:2015-11-30 Online:2016-05-25 Published:2016-05-25

摘要/Abstract

摘要： 通过调控DDS的添加量,制备不同胺/环氧当量比的TDE-85/DDS环氧树脂体系:环氧过量(r=0.8)、等当量比(r=1)和胺过量(r=1.2);将氨基化多壁碳纳米管(MWCNTs-NH₂)加入这三种体系中,研究当量比对MWCNTs-NH₂/环氧树脂复合材料的固化动力学和拉伸性能的影响。结果表明,MWCNTs-NH₂对环氧-胺体系固化动力学和拉伸性能的影响与r密切相关。当r=0.8时,MWCNTs-NH₂可以充分地与环氧基团发生开环反应,树脂体系的活化能显著降低,拉伸强度和模量分别提高了17%和20%;当r=1时,MWCNTs-NH₂加入后,活化能降低的同时固化反应动力学由化学控制转变为扩散控制,拉伸强度和模量分别提高10%和14%;当r=1.2时,MWCNTs-NH₂加入后,树脂体系在反应后期的活化能降低,造成局部的过度交联,拉伸强度降低了14%,模量仅提高了9%。

关键词: 环氧-胺体系, 当量比, MWCNTs-NH₂, 固化动力学, 复合材料

Abstract: By regulating the DDS contents of TDE-85/DDS system, different epoxy-amine stoichiometry ratios, i.e. the excess of epoxy (r=0.8), stoichiometric ratio (r=1) and excess of hardener (r=1.2) were obtained. Amino-functional multi-walled carbon nanotubes (MWCNTs-NH₂) were added into these systems and the effects of the epoxy-amine stoichiometry ratios on the curing kinetic and tensile properties of MWCNTs-NH₂/epoxy composites were compared and evaluated. The results showed that the curing kinetic and tensile properties of MWCNTs-NH₂/epoxy nanocomposites were closely related to the epoxy-amine stoichiometry. When r=0.8, MWCNTs-NH₂ can adequately participate in the crosslinking reaction in the excess of epoxy. Compared with neat epoxy, a significantly catalytic effect of curing reaction can be obtained with addition of MWCNTs-NH₂. As a result, about 17% and 20% increase of tensile strength and modulus, respectively,were observed. When r=1, the curing reaction was changed from chemical control to diffusion control; the tensile strength and the modulus of the MWCNTs-NH₂/epoxy nanocomposites were only increased about 10% and 14%, respectively. When r=1.2, compared with neat epoxy, the addition of MWCNTs-NH₂ resulted in a lower activation energy during the last stage of cure reaction, leading to excessive crosslinking reaction in the local scale. As a result, the tensile strength of the MWCNTs-NH₂/epoxy nanocomposites was reduced about 14%, while the tensile modulus of the composites was only increased about 9%.

Key words: epoxy-amine, stoichiometry ratio, MWCNTs-NH₂, curing kinetic, composites

中图分类号:

TB332

唐峰,张清杰,高亮,吴剑桥. 胺/环氧当量比对MWCNTs-NH₂/环氧树脂复合材料性能的影响[J]. 玻璃钢/复合材料, 2016, 0(5): 85-90.

TANG Feng, ZHANG Qing-jie, GAO Liang, WU Jian-qiao. EFFECTS OF THE EPOXY-AMINE STOICHIOMETRY RATIO ON THE PROPERTIESOF MWCNTs-NH₂/EPOXY COMPOSITES[J]. Fiber Reinforced Plastics/Composites, 2016, 0(5): 85-90.

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胺/环氧当量比对MWCNTs-NH₂/环氧树脂复合材料性能的影响

EFFECTS OF THE EPOXY-AMINE STOICHIOMETRY RATIO ON THE PROPERTIESOF MWCNTs-NH₂/EPOXY COMPOSITES

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