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The effect of cupric ion on the radiation grafting of N ‐vinyl‐2‐pyrrolidone and other hydrophilic monomers onto silicone rubber
Author(s) -
Ratner Buddy D.,
Hoffman Allan S.
Publication year - 1974
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.1974.070181101
Subject(s) - silicone rubber , monomer , grafting , copolymer , materials science , wetting , self healing hydrogels , silicone , polymer chemistry , penetration (warfare) , attenuated total reflection , polymer , chemical engineering , chemistry , composite material , infrared spectroscopy , organic chemistry , operations research , engineering
Radiation grafting systems containing cupric ion, N ‐vinyl‐2‐pyrrolidone (N‐VP) and other hydrophilic monomers were studied. Such systems, in certain Cu ++ ion concentration ranges were found capable of producing extremely high levels of graft on silicone rubber and other polymers. Gellation of the homopolymer surrounding the grafted film was inhibited by the presence of cupric salts. An increase in the graft water content and decrease in the wettability of the grafted film surface was noted as the Cu ++ ion concentration in the grafting solution was increased. Based upon attenuated total reflectance infrared spectroscopic examination of the grafted materials, these effects could be explained by variations in the copolymer composition of the graft and increased penetration of the graft into the silicone rubber with increasing cupric ion concentration. The Cu ++ /N‐VP system allows many monomers which would ordinarily graft only with great difficulty to be readily grafted to polymeric surfaces. It also allows control over a number of graft parameters such as graft water content composition and penetration. Therefore, this system should be ideal for preparing a series of radiation grafted hydrogels to be used to evaluate important variables in the interactions of hydrophilic biomaterials and biological systems.