A calorimetric comparative study of hydrogenated and deuterated diacetylene 2,4 hexadiynylene bis(p-toluenesulfonate): Phase diagrams and polymerization

✍ Scribed by J. Even; M. Bertault; S. Longeville; A. Collet

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 206 KB
• Volume: 35
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(19970415)35:5<789::aid-polb7>3.0.co;2-h

✦ Synopsis

Microcalorimetry was used to study the thermal polymerization and the structural instabilities in hydrogenated ( p TS-H ) and deuterated ( p TS-D ) diacetylene 2,4-hexadiynylene bis ( p -toluenesulfonate ) . In the induction period, the polymerization reaction proceeds about seven times faster in p TS-D than in p TS-H. Whereas the phase transitions of pure p TS-H and p TS-D monomer crystals and of pure p TS-H and p TS-D polymer crystals are very similar, the situation is completely different for mixed monomer -polymer crystals of p TS-H and p TS-D. The results are interpreted by studying comparative influence of the chain lengths for p TS-H and p TS-D oligomers. A comparison is made between these results and previous experimental results obtained from dielectric measurements, UV-spectroscopy, X-ray, and elastic neutron scattering.