Measurement of Modified Surface Properties (Micro-Creep) of Polyamide by Modern Indentation Method

Abstract

Good quality of surface layer is an important aspect for correct function and longevity of final product. Surface layer was modified by beta radiation with differing intensity. Radiation caused creation of three dimensional spatial network, that directly leads to improvements of the tested polymer’s (PA11, PA12) surface properties. Surface properties (micro-creep) were measured by micro-indentation test on MHT3 machine. Goal of this paper is to modify the surface layer (by using several different intensities of beta radiation) in a way, that causes increase in resistance against long term stress (micro-creep) in the final product, which is an important property that ensures correct function of the product. The changes in micro-creep were compared and afterwards confirmed by the use of gel test, that showed us what percentage of the whole part was crosslinked.