Accession Number : ADA296513
Title : Optimization of Low Temperature Vitrification for Surface Analysis of Hydrated Hydrogel Polymers.
Descriptive Note : Technical rept.,
Corporate Author : STATE UNIV OF NEW YORK AT BUFFALO DEPT OF CHEMISTRY
Personal Author(s) : Schamberger, Patrick C. ; Gardella, Joseph A., Jr. ; Grobe, George L., III ; Valint, Paul L., Jr
PDF Url : ADA296513
Report Date : SEP 1994
Pagination or Media Count : 55
Abstract : A method for analyzing hydrated hydrogel polymer surfaces in ultra-high vacuum atmospheres has been developed. The materials used for this study were commercially available poly(2-hydroxyethylmethacrylate) (HEMA) based hydrogel polymer ("soft") contact lenses. Application of a temperature controlled sample handling attachment for maintaining liquid nitrogen temperature samples is discussed. Issues such as ample handling, sample preparation, X-ray damage, have been investigated and controlled. Compared to a hydrated surface, specific surface enrichments of various components such as poly(dimethylsiloxane) and poly(N-vinylpyrrolidone) on the dehydrated surface are detected. This is likely due to surface energetics and differences in hydrophobicity/hydrophilicity of the components. jg p.1
Descriptors : *LOW TEMPERATURE, *SURFACE ANALYSIS, *OPTIMIZATION, *POLYMERS, DAMAGE, X RAYS, HYDRATES, SAMPLING, LIQUID NITROGEN, ATMOSPHERES, ENRICHMENT, HYDROPHOBIC PROPERTIES, ULTRAHIGH VACUUM, SURFACE ENERGY, CONTACT LENSES.
Subject Categories : Polymer Chemistry
Distribution Statement : APPROVED FOR PUBLIC RELEASE