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Effect of deformation on the surface composition of multicomponent polymers. II. Blends of polydimethylsiloxane–polysulfone block copolymers in polychloroprene
Author(s) -
Gorelova M. M.,
Pertsin A. J.,
Volkov I. O.,
Sanches N. B.,
Gomes A. S.
Publication year - 1998
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19980919)69:12<2349::aid-app6>3.0.co;2-8
Subject(s) - copolymer , materials science , polydimethylsiloxane , polymer chemistry , polymer , x ray photoelectron spectroscopy , overlayer , composite material , polymer blend , polysulfone , polyethylene , chemical engineering , chemistry , engineering
The effect of uniaxial stretching on the surface composition of dilute blends of polydimethylsiloxane/polysulfone 2500/44,000 and 2500/3500 block copolymers in polychloroprene is studied using X‐ray photoelectron spectroscopy. The surface of the initial (unstretched) blends is found to be covered by a discontinuous copolymer overlayer with a thickness greater than the XPS sampling depth. The stretching leads to a substantial drop in the extent of the copolymer surface segregation. For the 2500/3500 block copolymer, the dependence of the surface composition of the blends on the stretching degree is well described by a homogeneous deformation model, whereas for blends of the 2500/44,000 copolymer, the stretching of the copolymer overlayer lags noticeably behind that of the polychloroprene matrix. In the blends of the 2500/3500 copolymer, the stretching has practically no effect on the distribution of the copolymer components in the near‐surface region. By contrast, the 2500/44,000 copolymer shows a substantial surface depletion of siloxane with stretching. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 2349–2356, 1998