~(29)Si and ~(13)C Solid State NMR as a Tool to Study Thermal Processes in Epoxy-Silica Hybrids

摘要

~(29)Si CP/MAS and ~(13)C CP/MAS measurements were carried out for epoxy-silica hybrids treated at 200deg C and 300deg C.For each sample,the ~(29)Si spin lattice relaxation time was evaluated and compared with the corresponding values for reference samples prepared under the same conditions but without epoxy compound.This work clearly shows the sensitivity of the ~(29)Si T_1 to the morphology of composite materials.The mechanism of thermal decomposition is proposed on the basis of C CP/MAS experiments and analysis of changes of the ~(29)Si T_1 relaxation time.