Study on Curing Mechanism of Epoxy Resin/Multi-Walled Carbon Nanotubes Composites Based on 2D Correlation Infrared Spectroscopy

LI Lu, ZHANG Xian-ming, ZHOU Li-jie

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Plastics Science and Technology ›› 2024, Vol. 52 ›› Issue (02) : 13-19. DOI: 10.15925/j.cnki.issn1005-3360.2024.02.003
Theory and Research

Study on Curing Mechanism of Epoxy Resin/Multi-Walled Carbon Nanotubes Composites Based on 2D Correlation Infrared Spectroscopy

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Abstract

Multi-walled carbon nanotubes (MWCNTs) play an important role in strengthening and toughening epoxy resin (EP) materials, but the surface activity of MWCNTs is different, and their mechanical properties, dispersion and interfacial bonding are very different, which is closely related to the curing mechanism of EP composites. In order to clarify the curing mechanism of epoxy resin/multi-walled carbon nanotube (EP/MWCNTs) composites and the influence mechanism of the introduction of MWCNTs on the curing behavior of EP matrix, the analysis methods of moving window 2D correlation infrared and generalized 2D correlation infrared were used to compare and analyze the variation of characteristic functional groups of pure EP and EP/MWCNTs during the heating and curing process. The results show that the curing process of pure EP is mainly the curing reaction between EP and primary amine group, and the ring opening of EP generates a new hydroxyl group and C—H without ring tension, while the 'steric hindrance effect' of EP/MWCNTs hinders the reaction process of EP in the early stage of curing, and the addition of MWCNTs has little effect on its curing mechanism. The difference is that during the curing process of EP/MWCNTs, the response of the primary amine group in the curing agent occurs before the epoxy group.

Key words

Multi-walled carbon nanotubes / Epoxy resin / 2D correlation infrared spectroscopy / Curing mechanism

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LI Lu , ZHANG Xian-ming , ZHOU Li-jie. Study on Curing Mechanism of Epoxy Resin/Multi-Walled Carbon Nanotubes Composites Based on 2D Correlation Infrared Spectroscopy. Plastics Science and Technology. 2024, 52(02): 13-19 https://doi.org/10.15925/j.cnki.issn1005-3360.2024.02.003

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