STATIC AND DYNAMICAL PROPERTIES OF BOTH MONOMER AND POLYMER PTS-D CRYSTALS - A COMPARATIVE-STUDY

Microcalorimetry and neutron and Raman scattering spectroscopy were used to make a static and dynamic comparative study of the structural instabilities of the disubstituted and fully deuterated diacetylene 2,4-hexadiynylene bis(p-toluenesulfonate) (pTS-D) in the monomer and polymer crystalline states. Monocrystals of monomer pTS-D undergo solid-state polymerization yielding monocrystals of conjugated polymer. We try to make a determination of the order parameter with the aim to understand the mechanism which leads to the structural instabilities observed in the two states. From an analysis based on the theoretical model ''PHI4'' we show that these instabilities present an intermediate character between order-disorder and displacive, with a more pronounced displacive character in the polymer than in the monomer.