COMPATIBILIZING EFFECTS OF POLY(STYRENE-GRAFT-ETHYLENE OXIDE) IN BLENDS OF POLYSTYRENE AND BUTYL ACRYLATE POLYMERS

Citation
P. Jannasch et al., COMPATIBILIZING EFFECTS OF POLY(STYRENE-GRAFT-ETHYLENE OXIDE) IN BLENDS OF POLYSTYRENE AND BUTYL ACRYLATE POLYMERS, Journal of applied polymer science, 59(4), 1996, pp. 619-626
Citations number
16
Categorie Soggetti
Polymer Sciences
ISSN journal
00218995
Volume
59
Issue
4
Year of publication
1996
Pages
619 - 626
Database
ISI
SICI code
0021-8995(1996)59:4<619:CEOPOI>2.0.ZU;2-X
Abstract
The compatibilizing effect of poly(styrene-graft-ethylene oxide) in po lystyrene (PS) blends with poly(n-butyl acrylate) (PBA) and poly(n-but yl acrylate-co-acrylic acid) (PBAAA) was investigated. No significant effects of the graft copolymer on the domain size were found in the PB A blends. By functionalizing PBA with acrylic acid, the average size o f the polyacrylate domains was reduced considerably by the graft copol ymer. Thermal and dynamic mechanical analysis of the PS/PBAAA blends r evealed that the PBAAA glass transition temperature (T-g) decreased wi th increasing graft copolymer content. The effect of the graft copolym er in the PS/PBAAA blends can be explained by interactions across the interface due to the formation of hydrogen bonds between the poly(ethy lene oxide) (PEO) side chains in the graft copolymer and the acrylic a cid segments in the PBAAA phase. Hydrogen bonding was confirmed by IR analysis of binary blends of PEO and PBAAA. Partial miscibility in the PEO/PBAAA blends was indicated by a PEO melting point depression and by a T-g reduction of the PBAAA phase. The thermal properties of the P EO/PBA blends indicated only very limited miscibility. (C) 1996 John W iley & Sons, Inc.