The Effect of Stretching on the Crystal Structure and Crystal Orientation of PA510/SiO(2) Films

In order to explore the relationship between the microstructure and macroscopic properties of PA510/SiO(2) films, the effect of the stretching on the crystal structure and crystal orientation of stretched PA510/SiO(2) films was studied. It could be seen from the transmission electron microscopy (TEM) graphs that the layered SiO(2) molecules were mainly oriented toward the machine direction (MD) and the dispersion could be improved by stretching. Through wide-angle X-ray scattering (WAXS) analysis, PA510/SiO(2) stretched films only contained a γ crystal form. During uniaxial stretching, especially for 1 × 3 film, the γ(1)(100) crystal form was obviously oriented in the equatorial direction, and the orientation of γ(2)(004) and γ(3)(006) crystal forms could be observed in the meridian direction. According to the Herman orientation function, the orientation of the b-axis in the MD increased with the increase of the stretching ratio. It was worth noting that the orientation of the crystal region was more obvious. The addition of SiO(2) and the orientation of the crystalline and amorphous regions could improve the barrier properties of the films. The changes in the optical properties of stretched films were affected by the dispersion state of SiO(2) and the surface roughness.