Abstract
PMMA/silica nano composite was innovated by the sol-gel process polymerization from methyl methacrylate (MMA) and tetraethyl orthosilicate (TEOS) with hydroxypropyl acrylate (HPA) as a coupling agent. It has been investigated that an acid catalyst or a catalyst-less condition affects the phase structure of PMMA/silica nano composite by X-ray photoelectron spectroscopy (XPS). Acid catalyst condition is controlled to be pH=4 by using hydrochloric acid. The XPS measurement was characterized by the ratio Si2p (Si-O-Si)/Si2p[(Si-O-C)+(.Si-O-Si). The results suggested the ratio of the covalent bonds between the organic component and the inorganic component (Si-O-C) under acid catalyst is higher than that under the catalyst-less condition.
