| 摘要 |
A process is disclosed for the solid phase preparation of triaxially oriented synthetic polymeric material from an orientable amorphous but crystallizable or a semicrystalline thermoplastic polymeric workpiece comprising (a) presenting the conditioned workpiece, at the entry mode of an opposing pair of solid rollers that are spaced apart a distance substantially less than the thickness of the workpiece; and (b) deforming the workpiece by compressive passage through the paired rollers at a nominal deformation ratios of at least 2 to 1. The deformation drawing is carried out between the glass transition temperature and the melting point of the polymeric material, by applying a draw tension insufficient to cause tensile failure of the workpiece. Also disclosed is a rolltruded copolymer membrane or film-like material with a triaxial orientation morphology with a periodicity consisting essentially of crystallite and amorphous materials or a periodic distribution of crystalline and intercrystalline tie regions. |
