Polymerization of diacetylenes in mixed multilayers

Abstract

Mixed multilayers of the Cd salts of pentacosa-10,12-diynoic acid and arachidic acid (mixture I) and tricosa-10,12-diynoic acid and tricosa-4,6-diynoic acid (mixture II) have been investigated with regard to their structure, miscibility, and polymerizability by the use of spectroscopic methods, X-ray and electron diffraction. In mixture I a phase separation into domains of the pure compounds is observed. Influences of the composition on the domain size and the maximum conversion to polymer are discussed. In mixture II a phase separation into domains of a 1: 1 mixture of both the compounds and into domains of the excess compound is observed. A structure model of the 1:1 complex phase is proposed.