ANALYSIS OF THE STEREOCHEMISTRY OF POLY(2,3-EPOXYPROPYL METHACRYLATE) BY 75-MHZ C-13 NMR-SPECTROSCOPY

The tacticity of poly(2,3-epoxypropyl methacrylate) has been analysed. For detailed elucidation of stereochemical features, polymers with varying degrees of tacticities were synthesized by anionic and free radical polymerization. Using two-dimensional 13C-1H correlation, signal assignments to different carbon atoms have been made. Using the peak multiplicities for carbonyl carbon atom resonance, in particular, tacticity assignments up to the pentad level have been achieved. The validity of sequence assignments has been tested and confirmed by calculated values from statistical relationships. While the anionically polymerized sample in toluene obeys a first-order Markov type chain growth process, the chain propagation for free radical polymer and anionic polymer in THF has been found to be Bernoullian.