MICROSTRUCTURE DETERMINATION OF POLY-(1,3-PENTADIENE) BY A COMBINATION OF INFRARED, 60-MHZ NMR, 300-MHZ NMR, AND X-RAY-DIFFRACTION SPECTROSCOPY

In the reported study, a quantitative procedure has been developed for characterizing the complete microstructure of polymers of 1,3-pentadiene, including the tacticity of any crytalline component. Ths can be accomplished by a combination of infrared spectroscopy, X-ray crystallinity, and 300-MHz NMR spectroscopy. A series of high structural purity polymers were synthesized with a series of previously unreported mixed microstructures. These samples were characterized by using the three techniques mentioned, including the previously unreported 300-MHz NMR data. With those results a 60-MHz NMR/IR method of spectroscopy was developed to determine the composition of poly(1,3-pentadiene)s in terms of percent cis-1,2-, cis-1,4-, trans-1,2-, trans-1,4-, and 3,4-pentadiene units.