Polymerization in liquid crystal — XVIII. Effect of the polyethyleneoxide main chain on the properties of polymers containing mesogenic groups in the side chain

✍ Scribed by F. Cser; K. Nyitrai; J. Horváth; Gy. Hardy

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 501 KB
• Volume: 21
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(85)90229-0

✦ Synopsis

The effect of the main chain on the mcsomorphic propcrlics ~as studicd on the basis of the three-component thermodynamic model of polymers containing mcsogcnic groups in the side chain. Poly(ethylene oxide) oligomers substituted with mcsogcnic groups ~clc prepared by reacting epichlorohydrin with mesogenic molecules. It was established that the glass transition temperatures of these oligomeric products were markedly reduced m comparison to polyacryhttes containing the same rigid core. The relatively flexible main chain increases the clearing point relative to that of the monomer. Clearing point rises with length of thc main chain. A ltcxiblc main chain suppresses the vibration of the rigid cores thus increasing the thermal stabilit~ of the mcsomorphic structure. No explanation was found for the exothcrmic hltcnt hcal of 170 .I'g obscrxcd during the first melting el the cholestcrvl succinyl cpoxypropionatc oligomers and polymers.