Accession Number : ADA184956

Title :   Molecular-Level Synthesis and Characterization of Metal-Polymer Interfaces.

Descriptive Note : Final rept. 16 Apr 84-15 Apr 87,

Corporate Author : MASSACHUSETTS UNIV AMHERST DEPT OF POLYMER SCIENCE AND ENGINEERING

Personal Author(s) : Ling, Shaw L ; McCarthy, Thomas J

PDF Url : ADA184956

Report Date : 23 Aug 1987

Pagination or Media Count : 17

Abstract : Two separate, but interacting research groups began a program entailing molecular level syntheses and characterization of metal-polymer interfaces. Two general synthetic routes were followed: In one case, a metal surface (platinum) was cleaned of its oxide layer by carrying out a hydrogenation reaction (hexene or cyclohexene) using the metal surface as the catalyst. Under these conditions, platinum oxide is unstable and is reduced to platinum(0) and water. The reaction was then deliberately poisoned with 4-picoline. Monitoring the kinetics of hydrogenation before and after the addition of the poison allowed us to determine that approx. 70% of the hydrogenation sites were ligated. The amount of 4-picoline that adsorbed was determined by elemental analysis, gravimetric analysis and UV-vis analysis of the solution. The surface-confined picoline was then deprotonated to render the ligated lithium reagent which was used to initiate the polymerization of styrene. The thin film of polystyrene prepared in this manner was irreversibly attached to the platinum surface. The platinum-polystyrene interface was studied by a range of analytical techniques. The platinum-polystyrene interface was studied by a range of analytical techniques. In the other case, a metal-polymer interface was prepared by polymer adsorption: Polystyrene containing one terminal thiol group and styrene-propylene sulfide block copolymers were allowed to adsorb on evaporated gold films supported on glass. The resulting supported films were characterized by x-ray photoelectron spectroscopy, external reflectance infrared spectroscopy and scintillation counting of radioisotope-labeled polymers.

Descriptors :   *POLYMERS, METALS, INTERFACES, SYNTHESIS(CHEMISTRY), PLATINUM, HEXENES

Subject Categories : Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE