COMBINED DEFT 1D AND INEPT DQF COSY 2D EXPERIMENTS IN SI-29 NMR-SPECTROSCOPY OF ALKOXYSILANE POLYMERS .2. APPLICATIONS OF SI-29 NMR TO POLYMERIZATION REACTIONS IN DIMETHYLDIETHOXYSILANE

Polymerization reactions in dimethyldiethoxylsilane were studied using a new high-resolution Si-29 NMR method, This method is a combination of two polarization transfer experiments (DEFT) with a Si-29-Si-29 two -dimensional INEPT DQF COSY NMR experiment, The structures of oligomer s were identified, including linear oligomers up to hexamers and cycli c oligomers with three, four or five silicon atoms, The distribution o f species was determined from the intensities of resonance lines, givi ng some information on the polymerization pathways.