Influence of various nature diluents on volume shrinkage kinetics of the epoxy oligomer at curing

Abstract

Diane epoxy oligomers (EO) are the most widespread among epoxies, their production makes more than 70% from the general release. To improve the impregnation of fibrous filler to create a polymer composite material (PCM) to reduce the viscosity of the binder and to that end the low viscosity diluents. This article presents the results of investigation of the influence of the various nature diluents on kinetics and value of the ED-20 brand and the EHD chlorine-containing brand epoxy oligomers final volume shrinkage is surveyed at solidification with the different types of low-viscosity liquid curing agents. Kinetic dependences of volume shrinkage of epoxy oligomer for different types of diluents are received at various concentration and dependence of shrinkage to answering point of jellification and shrinkage to answering point of the beginning of jellification from concentration of diluents. It is established that using active diluents to 20% mass decreases viscosity of the epoxy oligomers, but the kinetics of shrinkage and final shrinkage practically don't change. Introduction of active low-viscid diluents in EHD brand EO to 20 wt.% practically doesn't change kinetics of shrinkage and value of final shrinkage and allows to reduce by 2-4 times viscosity binding that leads to the referred adjustment of technical characteristics polymeric binding and conditions of processing of systems on the basis of EHD. Final heat treatment of samples at an increased temperature practically has no impact on shrinkage, however its carrying out is expedient as it leads the glass transition temperature increase.

Keywords

• epoxy oligomers, diluents, volume contraction, kinetics.