On the relationship crystal structure - properties at flexible chain polymers. I. Polycaprolactam

There are applied different methods as high temperature X ray, microscopic, spectroscopic, calorimetrical, heat, mechanical etc. There are mostly studied the deformation and destruction of the elementary cells of the polycaprolactam basic crystal forms. By change of the intensity distribution of the powder X-ray diffraction there are controlled as the profile and angle deviation on different diffraction reflections, as well as the alterations in the packing of the macromolecular chain segments in the crystal phase. There are defined the critical deformation values caused the polymorphic transitions. The present results are connected with the crystal phase perfection and with the quantitative proportion of the simultaneously existed crystallographic modifications in the studied objects at the given conditions. There is supposed a mechanism of structural development connected with the specificity in the H-bonds redistribution at the polycaprolactam.