ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Dielectric measurements using a frequency region 106–1010 Hz were performed on methanol and ethanol-polyvinyl pyrolidone systems by a time domain reflectometry. Two relaxation peaks were observed for each system. The high frequency process is the primary process of the alcohols. Relaxation time varies little with the polymer concentration. In the case of the ethanol system, its extrapolated value for pure polymer is 280 ps and does not differ much from the value of 130 ps for pure alcohol. For the methanol system, it changes from 280 to 55 ps. It is suggested that the process is due to reorientation of two hydroxyl groups in the alcohol chain, which involves breakage and remaking of a hydrogen bond and the low frequency process, of which relaxation time is about 10 ns, is due to reorientation of alcohol molecules bonded to the polymer.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.459308
