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

Abstract

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

CLC Number:

TB332

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

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