胺/环氧当量比对MWCNTs-NH_2/环氧树脂复合材料性能的影响  被引量:1

EFFECTS OF THE EPOXY-AMINE STOICHIOMETRY RATIO ON THE PROPERTIES OF MWCNTs-NH_2/ EPOXY COMPOSITES

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作  者:唐峰[1] 张清杰[2] 高亮[2] 吴剑桥 隋刚[2] 杨小平[2] 

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

出  处:《玻璃钢/复合材料》2016年第5期85-90,共6页Fiber Reinforced Plastics/Composites

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%。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%.

关 键 词:环氧-胺体系 当量比 MWCNTs-NH2 固化动力学 复合材料 

分 类 号:TB332[一般工业技术—材料科学与工程]

 

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