Characterization of the orientation in synthetic polymer sheets using far-infrared radiation

Molecular orientation and mass distribution have been measured in various s ynthetic polymers using a characterization technique developed by the autho rs. This method is based on the transmission of polarized far-infrared radi ation. Fairly thick samples (polyethylene up to one centimeter thick) can b e tested easily with this nondestructive approach. Spatial resolution in th e millimeter range is possible. This allows the characterization of various industrial products made of nylon, polyethylene, polypropylene or polyeste rs, such as liquid containers, injection-molded parts, thick extruded or dr awn sheets and rods, etc. Potential scientific and industrial applications are discussed.