Miscibility and dynamics of the poly(vinylimidazole-co-methyl methacrylate)-silica hybrids studied by solid-state NMR

Poly(vinylimidazole-co-methyl methacrylate)-silica hybrids, bonded through hydrogen bond (PVM-SiO2) or chemical bond (PVM(5)-SiO2) between organic and inorganic units, were prepared and characterized. The characterization of PVM-SiO2 and PVM(5)-SiO2 hybrids were confirmed by IR, C-13 and Si-29 NMR spectra. The intermolecular interaction between copolymer chains was studied by the spin-lattice relaxation time in the rotating frame (T-1p(H)) and that between copolymer and silica was evaluated by the time constant for energy change between H-1 and Si-29 spin system (T-siH). T-1p(H) and T-siH values in PVM-SiO2 hybrids were consistent with those in PVM(5)-SiO2 hybrids, and those were independent of the silica content. Moreover, the T-1p(H) values are in order of poly(methyl methacrylate)-silica hybrids (PMMA-SiO2) > PVM-SiO2 = PVM(5)-SiO2 > polyvinylimidazole-silica hybrids (PVI-SiO2), while those of T-siH are in reverse order PMMA-SiO2 less than or equal to PVM(5)-SiO2 < PVI-SiO2 (C) 2003 Elsevier Ltd. All rights reserved.