抄録
In the previous report, it was investigated the orientation behavior of reciprocal lattice vectors of crystallites in orthogonal-biaxially stretching PVA film, by using pole figure analyses of X-ray diffraction. In this report, the orientation behaviors of crystallites and non-crystalline chain segments in orthogonal-biaxially stretched VPA film are investigated by means of the equilateral triangle evaluation of mean square of direction cosine by X-ray diffraction, dichroic ratio and birefringence measurements.
1) For the orthogonal-biaxially stretching, the plane of hydrogen bond in PVA, i.e., (101) plane tends to orient parallel to the film plane. This phenomena is interpreted in terms of slipping of (101) plane by the shear stress originated by the compression force parallel to the thickness direction within the bulk film.
2) The orientation behavior of crystal b-axis and the other reciprocal lattice vectors follow on the slip of (101) plane.
3) The noncrystalline chain segment tends to orient parallel to the film surface with the orthogonal-biaxially stretching, and its behavior follows in the external stress of the machine direction.
