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Oxygen permeability and surface free energy properties of silicone‐containing copolymers of methyl methacrylate
Author(s) -
Erbil H. Yildirim
Publication year - 1988
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/app.1988.070360102
Subject(s) - copolymer , polymer chemistry , oxygen permeability , methyl methacrylate , silicone , methacrylate , materials science , ethylene glycol dimethacrylate , ethylene glycol , ether , oxygen , chemistry , organic chemistry , methacrylic acid , polymer , composite material
Novel organofunctional siloxanes from γ‐methacryloxypropyltrimethoxysilane (MPTMS) were synthesized by transesterification reactions with high monohydric alcohols, branched alcohols, ether alcohols, phenol, and mandelic acid. The factors effecting the substitution ratios were determined. Copolymers of these siloxanes with methyl methacrylate (MMA) were prepared by bulk copolymerization in glass molds and their swelling, thermal, oxygen permeability, and surface free energy characteristics were investigated in order to determine the effect of the substituted group on the produced copolymer. The changes in these properties by the crosslinking of the copolymer with ethylene glycol dimethacrylate (EGDM) were also investigated. The copolymers containing branched, nonpolar, and lengthy pendant groups were found to be highly oxygen permeable possibly due to the introduction of larger free volume by these groups. The surface energy analysis showed that the main variation was found to be in γ SV Pvalues rather than γ SV dvalues and only ether alcohol substitution increased γ SV Pvalues to a greater extent.