The Adhesion, Mechanical Properties and Water Resistance of Vinyl Acetate Copolymer Based Blends

Abstract

The possibility to use water based vinyl acetate/butyl acrylate (VA/BA) copolymer blends with various content of vinyl ester of versate acid/metyl methacrylate (VeoVa-10/MMA) or versate acid esther/metyl methacrylate/ /2-ethylhexylacrylate (VeoVa-10/MMA/2-EHA) terpolymer for the preparation of adhesive joints after adhesive layer heat reactivation have been investigated. The adhesion, mechanical and physical properties of both pure components and blends have been determined.
The effective enhancement of adhesion properties was obtained when VeoVa-10/MMA copolymer as modifier was used. After heat reactivation, blends with 20 – 30 wt.% of this modifier show more than 40 % higher peel strength compare to those of non reactivated. The heat treatment results in the increase of tensile strength of free adhesive films. Especially that is expressed for blends with VeoVa-10/MMA/2-EHA terpolymer. Both the blending and the heat treatment decrease deformability of VA/BA films, also. The influence of modifier type on the films deformability is negligible.
Besides, heat treatment and the increase of polymer modifier content decrease water sorption capability.