X‐Ray determination of the crystallite orientation distributions of polyethylene terephthalate films

Abstract

Abstract A set of definitions is proposed to describe uniquely the six types of orientation possible in semicrystalline polymeric films. Oriented polymer films were studied by a new x‐ray diffraction technique which permits rotation of a sample about a number of independent axes yielding orientation distributions of the crystalline regions. The definitions and the method of measuring the crystallite‐orientation distributions have been applied to polyethylene terephthalate films.