Abstract
The structural analyses of silicon-based polymers such as polysilanes and poly[(phenylsilylene) ethynylene-1, 3-phenyleneethynylene] (abbreviated by MSP) by solid-state NMR were reviewed. As an example for polysilanes, the structure of solid polymethyiphenylsilane over a wide range of temperatures has been successfully elucidated by solid-state NMR combined with FPT-CNDO/2 MO method. On the other hand, for MSP thermosetting mechanism has been elucidated. The intermolecular cross-linking reactions owing to 1) the Diels-Alder reaction and 2) the hydrosilylation reaction occur at above 150°C, and a very highly thermally stable structure is formed. It has been demonstrated that solid-state NMR is a very useful tool to study the structure and dynamics of silicon-based polymers.
