Effects of sample preparation method on mixing and phase separation in binary polymer blends

Citation
P. Rojanapitayakorn et al., Effects of sample preparation method on mixing and phase separation in binary polymer blends, POLYMER, 42(8), 2001, pp. 3475-3487
Citations number
34
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
POLYMER
ISSN journal
0032-3861 → ACNP
Volume
42
Issue
8
Year of publication
2001
Pages
3475 - 3487
Database
ISI
SICI code
0032-3861(200104)42:8<3475:EOSPMO>2.0.ZU;2-J
Abstract
Detailed studies of effects of sample preparation method on the kinetics of phase separation in a blend of polystyrene-co-maleic anhydride (SMA) with a commercial sample of polymethyl methacrylate containing ethyl acrylate as co-monomer (PMMAe) have been performed using light scattering techniques. Two preparation methods, viz. solution casting and melt mixing in a mini tw in screw extruder were employed in this work. The blend, which shows lower critical solution temperature (LCST) behaviour, exhibits spinodal and binod al curves at higher temperatures in the case of solution casting than those from melt mixed samples. The relative values of the Cahn-Hilliard growth r ate, R(q), obtained from the two preparation methods depend on blend concen tration, R(q) being faster for solution cast samples at some concentrations and slower at others. Comparison of the data with recent theoretical devel opments for entangled polymer blends is reported. (C) 2001 Elsevier Science Ltd. All rights reserved.