Viscoelasticity of Chemically Bonded Interfacial Epoxy-Polyurea Matrix per Migration of Epoxy Species via Curing Time Parameter

摘要

A new fiber (x) reinforced Dynamic Covalent epoxy-polyurea Interface (x-DC_(ep)I) shows good mechanical energy transferability of impact and vibration forces. The bonding property of x-DCepI interface, engendered between curing, or reactive, epoxy and dynamic polyurea, is controlled by epoxy curing time (t_c). The reaction of curing epoxy, where t_c is a thermodynamic processing parameter, and fast-curing/ dynamic aliphatic polyurea, which lacks polyol in its resin chain extender, is linked to bulk mechanical energy transfer, quantified specifically via the loss modulus of x-DCepI. The parameter t_c effectuates designable chemical bond properties within x-DCepI. Using Generalized Maxwell models, viscoelastic properties of epoxy, polyurea, and x-DCepI are predicted, and results are verified using Dynamic Mechanical Analysis (DMA). The Maxwell models for x-DC_(EP)I, as a function of t_c, are used in a finite element analysis (ABAQUS) to control performance of dynamically loaded structures.