Effect of Liquid Eucommia ulmoides Gum on Curing Kinetics of Epoxy Resin

HUANG Yiqi, YANG Feng, WANG Xinyuan, HAN Wenchi, LI Long, OUYANG Jinghao, WU Tingting

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Plastics Science and Technology ›› 2025, Vol. 53 ›› Issue (01) : 28-34. DOI: 10.15925/j.cnki.issn1005-3360.2025.01.005
Theory and Research

Effect of Liquid Eucommia ulmoides Gum on Curing Kinetics of Epoxy Resin

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Abstract

The influence of crystalline liquid Eucommia ulmoides gum (cLEUG) and amorphous liquid Eucommia ulmoides gum (aLEUG) on the curing kinetics of epoxy resin E-51/polyamide 650 (PA650) systems was studied by a non-isothermal DSC method. The kinetic parameters of the non-isothermal processes for the three systems of E-51/PA650, E-51/cLEUG/PA650, and E-51/aLEUG/PA650 were determined using the Starink method. The kinetic equations for the curing reactions of the three systems were established and compared with experimental data. The results showed that the liquid Eucommia ulmoides gum (LEUG) co-cured with E-51, and the addition of LEUG reduced the apparent activation energy (Ea ) of the curing reaction of E-51/PA650, promoting the occurrence of the curing reaction. The Ea of E-51/cLEUG/PA650 system increased with the increase of conversion, while the Ea of E-51/aLEUG/PA650 system decreased with the increase of conversion. The viscosity of the system and the number and activity of epoxy groups on the LEUG chain are the reasons that affect the curing reaction kinetics. The self-catalytic reaction model equation established by Starink method is suitable for describing the kinetics of E-51/LEUG curing reaction.

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Epoxy resin / Liquid Eucommia ulmoides gum / Curing kinetics / Non-isothermal / Activation energy

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HUANG Yiqi , YANG Feng , WANG Xinyuan , et al . Effect of Liquid Eucommia ulmoides Gum on Curing Kinetics of Epoxy Resin. Plastics Science and Technology. 2025, 53(01): 28-34 https://doi.org/10.15925/j.cnki.issn1005-3360.2025.01.005

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