Mesoporous silica nanoparticles( MSNs) were synthesized by sol-gel method with triethanolamine as mild alkaline catalyst,cetyl trimethyl ammonium bromide( CTAB) as template,TEOS as silicon source. The mesoporous silica surface was modificed with a silane coupling agent 3-( methacryloxy) propyl trimethoxysilane( MPS). Mesoporous silica nanoparticles-polymethylacrylic acid( MSNs@ PMAA) composite microspheres were synthesized by precipitation polymerization method with methacrylic acid( MAA) as raw material,wh...