Jf. Mano et al., MOLECULAR MOTIONS IN A RIGID BACKBONE POLYMER - POLY(N-HEXYL ISOCYANATE) - A STUDY BY THERMALLY STIMULATED CURRENTS, Journal of the Chemical Society. Faraday transactions, 91(13), 1995, pp. 2003-2007
Citations number
24
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
The molecular motions of poly(n-hexyl isocyanate) have been studied sy
stematically by the technique of thermally stimulated discharge curren
ts (TSDC) in the temperature range -160-120 degrees C. Owing to the th
ermal decomposition of the substance occurring at temperatures near 12
0 degrees C, it was not possible to extend the study to higher tempera
tures and, particularly, it was not possible to study the molecular dy
namics in the liquid-crystalline phase. In the studied temperature ran
ge, a complex pattern of relaxation mechanisms was observed, which inc
luded a low-temperature relaxation ascribed to the mobility of side-ch
ain alkyl groups, the glass-transition relaxation (T-g = -50 degrees C
) and a higher temperature relaxation ascribed to the worm-like motion
s of the polymer backbone.