THE VERSATILE SURFACE-PROPERTIES OF POLY(CYCLOPENTADIENE)-MODIFIED SILICA PARTICLES (PCPD-SILICA) - XPS AND ELECTROKINETIC STUDIES

Surface properties of poly(cyclopentadiene)-silica hybrid particles (P CPD-silica) were studied by means of XPS and electrokinetic measuremen ts. The surfaces of PCPD-silica particles exhibit two different areas with different properties: bare silica holes and PCPD patches. The PCP D chains contain different functional groups such as alcohol and carbo nyl groups that were identified by XPS. The PCPD chains are grafted co valently onto the silica surface via Si-O-C bonds created by the react ion of silanol groups and active PCPD chains. The amount of Si-O-C was examinated by means of XPS. The Bronsted acidity of the residual sila nol groups was determined by means of electro-kinetic measurements. It was found that the pit, values of the residual silanol groups increas e with increasing polymer content on the particle surface. The surface acceptor strengths of the hybrid particles in non-aqueous liquids wer e investigated by the solvatochromic indicator bis(1,10-phenanthroline )-cis-dicyano-iron-II in 1,2-dichloroethane.