Polymer films such as polypropylene and polyethylene are drawn in molding while heating to increase physical strength. Since the crystal components in the film are oriented in a specific direction as the film is drawn, it is difficult to obtain sufficient information only by reflection method like a powder diffraction. It is efficient to perform omnidirectional measurement by transmission method using single crystal X-ray diffractometers to analyse in three dimensions which types of orientations exist in the whole sample.
Measuring three-dimensional orientation in biaxially oriented polymer films
Measuring Three-dimensional preferred orientation in uniaxially oriented polymer films