Study on the synergistic effect of TPF phenolic curing agent and OMMT on the cured multifunctional epoxy grafted by SAP

Epoxy adhesive with excellent comprehensive properties is in demand. Here, multifunctional epoxy resin(AFG-90H) with high heat resistance and brittleness was chosen as matrix, and phenolic curing agent (TPF) based on diphenyl ether was prepared from p-tert-butylcatechol (TBC), formaldehyde and diphenyl ether. Due to the existence of diphenyl ether, the toughness of the cured AFG-90H epoxy resin can be improved. At the same time, bisaminopropyl polydimethylsiloxane modified by acid anhydride (SAP) and organic montmorillonite (OMMT) were introduced into AFG-90H epoxy resin to improve its comprehensive properties. The results show that the curing temperature of TPF and AFG-90H resin is below 100℃. When OMMT with mass fraction of 10 phr was added to AFG-90H grafted with SAP with mass fraction of 10 phr, the thermal degradation temperature (T _d5% ) is up to 359℃, and the tensile strength, bending strength, impact strength and tensile shear strength is 73.29MPa, 75.00MPa, 11.31kJ/m ² and 14.09MPa, respectively. The synergistic effect of TPF, OMMT and SAP can make the cured AFG-90H resin possess good comprehensive properties.