AN NMR-STUDY OF STRUCTURE AND DYNAMICS OF POLY(FUMARATE)S IN THE SOLID-STATE (II)

C-13 spin-lattice relaxation times (T1c) and C-13 CP-MAS NMR spectra of poly(methyl tert-butyl fumarate) (PMETBF) and poly(isopropyl tert-butyl fumarate) (PIPTBF) were measured over a wide range of temperatures (-30 to 100-degrees-C). From these results, the molecular motion of the main chain and side chains of these polymers was elucidated, and the reorientation frequency of the main chain of PMETBF and PIPTBF was found to be below 67.8 MHz in this temperature range. Further, it was found that the mobilities for the meso-meso (mm) and meso-racemic (mr) triads of PIPTBF were almost the same below 85-degrees-C, but above 85-degrees-C the mobility for the mm triad was lower than that for the mr triad. However, there was no difference in the mobility between the mm and mr triads of PMETBF within the measured temperature range.