1971 Volume 27 Issue 1 Pages 20-29
The orientation behaviors of crystalline and non-crystalline phases of uniaxially stretched PVA dyed with Congo Red, were observed by means of simultaneous measurements of X-ray diffraction, visible dichroic ratio and birefringence.
The following results were obtained:
1) The orientation behavior of crystallites in the dfferent degree of crystallinity of the polymers, such as higher crystallinity polymers, the preferential orientation of crystallites with stretching, especially at low degrees of stretching, were observed.
2) For the stretched specimens at a released state, we could not recognize clearly the effect of crystallinity, through the measurementsof visible dichroic ratio.
3) The decrease in crystallinity during the uniaxially stretching, were considerable in the higher degree specimens.
4) As a result of the orientation evaluation of crystalline and non-crystalline phases, it was found that the rod floating model is available for the consideration of crystalline orientation behavior.
