Crystallite thickness determn. in polymers - by deflecting visible light passing through small polymer sample w.r.t. temp., measuring light intensity variation and calculating thickness distribution

摘要

Method is for determn. of both the crystallite thickness distribution of polymers and also the mean values. Light is passed through a sample of a given polymer, is slightly deflected and through variation of sample temp., changes in light intensity of visible light are recorded. Light components perpendicular to the oscillating direction of the primary beam of the deflected light is filtered out. The deflected light intensity values are differentiated and the resulting curve is subjected to a non-linear mathematical transformation to determine a relationship between melting pt. and crystallite thickness. Mean values of crystallite thickness distribution are calculated according to known formulae. USE/ADVANTAGE - The method is used to characterise polymers, esp. partially crystalline polymers, uses only small samples and is inexpensiv