INTERACTION AND BOUNDARY PHASE STRUCTURE BETWEEN STEREOREGULAR POLY (METHYL METHACRYLATE) AND POLYAMIDE SUBSTRATE

Abstract

For the purpose of studying the effect of stereoregularity of poly (methyl methacrylate) (PMMA) on the interaction and boundary phase structure between PMMA and polyamide substrate, the mechanical dispersion and X-ray photoelectron spectrum (XPS spectrum) were measured for PMMA composite reinforced with short Kevlar^® fiber and PMMA film formed on nylon-6 plate, respectively. The interaction between the matrix and reinforcement is estimated to be weaker for the composite made with isotactic PMMA compared with the composites made with atactic and syndiotactic PMMA from the mechanical dispersion data. By analysing the XPS spectra, it can be shown that the enrichment of the carboxylic group at the vicinity of nylon-6 surface occurs for the cases of atactic and syndiotactic PMMA but cannot be seen for the case of isotactic PMMA. This means that the boundary phase structure varies depending on the stereoregularity of PMMA. These differences of the interaction and boundary phase structure can possibly be attributed to the difference of such a molecular characteristic of PMMA as the overall molecular conformation or the degree of constraint on the rotation of molecular chain depending on the tacticity of PMMA.