Accession Number : ADA291909
Title : Surface Studies of Poly(Organophosphazenes) Containing Dimethylsiloxane Grafts.
Descriptive Note : Technical rept.,
Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF CHEMISTRY
Personal Author(s) : Allcock, Harry R. ; Smith, Dawn E.
PDF Url : ADA291909
Report Date : 06 MAR 1995
Pagination or Media Count : 35
Abstract : Poly(organophosphazenes) containing dimethylsiloxane grafts were synthesized by carrying out hydrosilylation reactions on polymer precursors that contained unsaturated side groups. The surface properties of the siloxane-containing polymers were studied by contact angle measurements and X-ray photoelectron spectroscopy. A cosubstituent poly(organophosphazene) containing both trifluoro- ethoxy side groups and grafted dimethylsiloxane side groups was found to have a surface rich in -CF3 groups. A poly(organophosphazene) with siloxane grafts but Phenoxy groups as the second substituent showed surface enrichment of the siloxane species. Surface-specific hydrosilylation reactions were detected between an allyl-functional polymer and heptamethyltrisiloxane dissolved in non-solvents for the polymer. Polymer films showed the presence of silicon to depths of 25-60 micrometers as measured by energy dispersive X-ray spectroscopy. jg
Descriptors : *METHYL RADICALS, *POLYMERS, *SILOXANES, *SURFACE PROPERTIES, *ORGANIC COMPOUNDS, *PHOSPHAZENE, ANGLES, MEASUREMENT, PRECURSORS, ENERGY, SURFACES, X RAY PHOTOELECTRON SPECTROSCOPY, SILICON, POLYMERIC FILMS, X RAY SPECTROSCOPY, PHENOLS, ENRICHMENT, TRANSPLANTATION, DISPERSIONS.
Subject Categories : Polymer Chemistry
Distribution Statement : APPROVED FOR PUBLIC RELEASE