Attenuation of concentration fluctuations after a quench to a temperature in the single-phase region

Citation
M. Okada et al., Attenuation of concentration fluctuations after a quench to a temperature in the single-phase region, POLYMER, 43(2), 2002, pp. 329-335
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
POLYMER
ISSN journal
0032-3861 → ACNP
Volume
43
Issue
2
Year of publication
2002
Pages
329 - 335
Database
ISI
SICI code
0032-3861(200201)43:2<329:AOCFAA>2.0.ZU;2-H
Abstract
Attenuation of concentration fluctuations in a polystyrene/poly(2-chlorosty rene) blend after a quench from a temperature in the spinodal region to one in the single-phase region was studied by using the time-resolved light sc attering technique and a scanning electron microscope. The characteristic w ave number q(m), where the maximum of the scattered light intensity was loc ated, move towards smaller values during the attenuation process. The corre sponding growth of the wave length of the dominant concentration fluctuatio n was clearly observed by the electron microscope. The scattered light inte nsities at small wave numbers were found to increase before they attenuated . In the later period the power-law behavior q(m) similar to t(-0.3) was ob served. The exponent was smaller than the value (0.5) obtained on the basis of the non-linear theory by Akcasu and collaborators. (C) 2001 Elsevier Sc ience Ltd. All rights reserved.