Modification of the Interface by Polymeric Peroxides — A New Approach to the Creation of Composites

Abstract

The peroxidic modification of the surface of a dispersed phase by heterofunctional polymeric peroxides (HFPPs) is discussed. HFPPs are carbochain polymers which have statistically located peroxidic (–OO–) and high-polar functional (carboxylic) groups along the main chain. Sharp differences in the polarity of these groups endowes HFPP macromolecules with the capability of interfacial adsorption in various polymeric colloidal systems. The reactions of the functional groups provide chemical bonding of the macromolecules to the interfacial surface. As a consequence of such physical adsorption or chemisorption of HFPP, peroxidation of filler surfaces and the localization of active –OO– groups on the interface may be effected. In addition, such –OO– groups can facilitate the grafting of matrix polymer macromolecules to the surface of the dispersed phase. Such grafting reactions can be carried out during polymer filling, the curing processes of composites or the vulcanization of a rubber mixture. It has been shown that an improvement in the physical and mechanical properties of polymers and an increase in the electroconductivity and heat conductivity of filled compositions is achieved on modification by HFPP.