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
      Inorganic Chemistry
      Organic Chemistry
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE