ISSN:
0887-6266
Keywords:
nylon-6
;
dry and water saturated
;
thermally stimulated depolarization current
;
dielectric relaxation
;
glass transition
;
water sorption
;
Physics
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The effect of water sorption on the dielectric relaxation processes of nylon-6 samples with water concentrations ranging from the dry to the water-saturated polymer has been studied by thermally stimulated depolarization currents experiments in a broad temperature range, from 77 to 365 K. The strengths of the low-temperature modes, γ- and β-peaks, are affected in opposite ways by the water concentration, h, as the first one shows a decrease in intensity and the second one grows as h increases. The precise determination of the relaxation parameters is made by the decomposition in elementary Debye processes and best fitting to the experimental profile of the complex peak. For h 〈 3%, the reorienting energies are almost independent of the water content, and the most significant intensity variations occur. The firmly bound water is held responsible for these effects. As for the higher temperature zone besides the α-peak, which is the dielectric manifestation of the glass transition, intermediate temperatures modes are observed at high h values and are originated by the loosely bound water, while the highest temperature peak is attributed to a Maxwell-Wagner interfacial polarization. The characteristic parameters of the α-mode are determined and related to the plasticization effect of water. © 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 35: 2879-2888, 1997
Additional Material:
10 Ill.
Type of Medium:
Electronic Resource
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