Macromolecular Compounds. CCXVI. Determination of the Lattice of Rubber

Abstract

Abstract In an earlier work a rotating crystal diagram, three different Schiebold-Sauter (rotating goniometer) equatorial diagrams and two different photomicrographs of the same sample of a single crystal were described and shown to be conclusive proof of the single-crystal texture of the sample under examination. If, in their work on the same subject, Meyer and Mark had likewise taken numerous photographs of different kinds, instead of a single photographic film, a comparison of the various photographs would speak for itself. In taking his rotating crystal goniometric photographs, the present author used uniformly thick, frozen small cubes of rubber, the intensities in the reflections of which were the same in all directions. On the contrary, in the photographs of Meyer and Mark, a stretched film of rubber, which reflected considerably less uniformly than did the samples used by the present author, was photographed at rest and therefore without being rotated. Although Meyer and Mark agree to the interference 300, they maintain that this does not explain in any way the appearance of reflection A2.