Effect of the Interfacial Structure on the Local Dynamics of Poly(methyl methacrylate)-Silica Hybrids

Poly(methyl methacrylate-maleic anhydride)-silica hybrid materials, P(MMA-MA5)-SiO 2 , were synthesized from the in situ reaction of methyl methacrylate (MMA) with 5 mol % maleic anhydride (MA),then hydrolyzed with 3-amino-propyl methyl diethoxysilane (APrMDEOS) coupling agent and tetraethoxysilane (TEOS) by asol-gel process. By the same method, the poly(methyl methacrylate-glycidyl methacrylate)-silica hybrids (P[MMA-GMA5]-SiO 2 ), reacted with 5 mol % glycidyl methacrylate (GMA), were obtained. The structure and relaxation of the hybrids were characterized by IR, and 29 Si- and 13 C-NMR spectroscopy. The effect of the interfacial structure on the local dynamics of the hybrids was investigated using the 29 Si- 1 H cross-polarization and proton spin-lattice relaxation time in the rotation frame.

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