X-ray Study of the Incommensurate Phase of Bis-(p-toluene Sulfonate) of 2, 4-Hexadiyne-1, 6 Diol as a Function of Polymer Conversion

Abstract

The incommensurate modulated structure earlier observed between 206 K and 163 K in monomer single crystals is studied as a function of polymer conversion. The temperature range of existence of this phase gradually decreases with increasing polymer conversion and disappears in the autocatalytic region. At this stage a single phase transition is observed to the low temperature commensurate superstructure 2a × b × c. In the region around 50% polymer conversion the width of the satellite reflexions at the wave vector (0.5a^*, δb^*, oc^*) reveals a slightly disordered structure. The dependence of the incommensurate wave vector component δ along b^* is found to be continuous in temperature and polymer conversion.