Calorimetric studies of the diacetylene monomer bis-isopropylurethane of 5,7-dodecadiyn-l,12-diol, synthesized by a new method, and the polydiacetylene (PDA) from this monomer (PDA-IPUDO) rule out the possibility that monomer melting plays a significant role in the thermochromic phase transition of this polymer. X-ray powder diffraction studies at room temperature and 150 + 5°C reveal that the structural changes which occur in the course of the endothermic thermochromic phase transition are analogous to those of a related PDA.
Посилання на статтю:
On the structural origins of solid-state urethane polydiacetylene thermochromism: thermal and structural properties of IPUDO monomer and polymer / S. H. W. Hankin, M. J. Downey and D. J. Sandman // Polymer. – 1992. – Vol 33. – P. 5098-5101.