Effect of filler particles on adhesive properties of poly (m-, p-phenylene isophtalamide) coatings

Abstract

The adhesive properties of composite coatings based on poly (m-, p-phenylene isophtalamide) with widely used antifriction fillers (copper phthalocyanine, molybdenum disulfide, graphite and boron nitride) were investigated. The results of measurements of adhesive characteristics are obtained by means of cross cutting test and quantitative peel test. Introduction of fillers leads to an increase in the adhesive strength of coatings, while the type of a filler virtually does not affect the adhesive properties. When the filler content is 20 wt.% and more, the cohesive fracture of the coating occurs during the peel test. Introduction of the fillers significantly reduces the value of internal stresses that is accompanied by an increase in the adhesion strength. By way of example of graphite, we showed that an increase in the particle dispersion of the filler results in an increase in the value of adhesion strength of composite coatings, but does not cause any fundamental changes in the character of the dependence of adhesion strength on the filler concentration.