AN AMPHIPHILIC GRAFT COPOLYMER AS A SURFACE-MODIFYING ADDITIVE FOR POLY(METHYL METHACRYLATE)

Citation
Lm. Zhu et al., AN AMPHIPHILIC GRAFT COPOLYMER AS A SURFACE-MODIFYING ADDITIVE FOR POLY(METHYL METHACRYLATE), Journal of polymer science. Part A, Polymer chemistry, 33(8), 1995, pp. 1257-1265
Citations number
23
Categorie Soggetti
Polymer Sciences
ISSN journal
0887624X
Volume
33
Issue
8
Year of publication
1995
Pages
1257 - 1265
Database
ISI
SICI code
0887-624X(1995)33:8<1257:AAGCAA>2.0.ZU;2-3
Abstract
An amphiphilic graft copolymer was prepared by transesterification of poly(2-ethylhexyl acrylate-co-methyl methacrylate) with poly(ethylene glycol) monomethyl ether (MPEG2000). The grafting reaction was perform ed in melt at 155 degrees C. The purified graft copolymer was blended into poly(methyl methacrylate) in concentrations of 1.5-30 wt %, eithe r by mixing in chloroform solution or by melt mixing by means of a twi n-screw extruder or a Brabender blender. Films of the blends were prep ared by solution casting onto glass plates or by hot pressing between polished Al plates. At concentrations up to 20% of the graft copolymer homogeneous blends were obtained. At higher concentrations the blends were heterogeneous, and side-chain crystallinity was detectable by DS C analysis. The surface properties of the films were studied by measur ements of water contact angles. The surface accumulation of the graft copolymer was demonstrated as a large increase in the wetting angle hy steresis, and found to depend on the procedure for film preparation as well as the casting substrate. (C) 1995 John Wiley and Sons, Inc.