Effect of heat treatment on changes in the crystalline domains in mylar film

Abstract EN

Changes in the crystalline domains caused by heat treating Mylar films between Tg to 240 oC have been studied by Fourier Transform Infrared spectroscopy (FTIR) and X-ray Diffraction (XRD).

Prior to glass transition temperature, shrinkage in the film is insignificant, but progresses rather abruptly direction namely é 110 _ rather than on the account of loosing order in favor of the amorphous regions.

as melting point is approached bringing the smooth film surface to rather wrinkle.

The absorbance increase in the FTIR spectra is due to the thickened film caused by shrinking rather than the improvement in the crystalline orientation.

XRD on the other hand show that heat treatment of the film near melting point only reduces the contribution of the crystalline domains in the direction [100] in favor of othe