Preparation of scratch and abrasion resistant polymeric nanocomposites by monomer grafting onto nanoparticles, 1 - FTIR and multi-nuclear NMR spectroscopy to the characterization of methacryl grafting

Full Paper: Nano-sized silica and alumina particles were used as fillers fo r polymer reinforcement and scratch resistant coatings. For favorable embed ding within the polyacrylate matrix the surface of the fillers was chemical ly modified by reaction with methacroyloxy (propyl)-trimethoxysilane. The f ormation of covalent Si(Al)-O-Si-C bonds between functional groups from sil ane and OH groups on silica and alumina was demonstrated by means of FTIR a nd MAS NMR spectroscopy. The reactivity of the various surface silanols tow ards the coupling agent and the yield of surface Si-O-Si bonds were estimat ed by Si-29 CP MAS NMR data. [GRAPHICS]