Dilute solution properties of polybutadiene modified by 4-phenyl-1,2,4-triazoline-3,5-dione

The dilute solution properties of 4-phenyl-1,2,4-triazoline-3,5-dione-modified polybutadienes were studied in tetrahydrofuran by static and dynamic light scattering and compared with those from unmodified polybutadiene chains. For the unmodified polymer, the scaling laws were established and the coil interpenetration parameter k(f0) was determined in the thermodynamically good solvent tetrahydrofuran; the chains exhibited common flexible chain behavior. For the modified polybutadiene, the results indicate at infinite dilution a weak extent of intermolecular crosslinking via the urazole groups, coupled with a very high extent of intramolecular ring formation. In order to evaluate the fraction of rings, an analysis of the association equilibrium by Fourier-transform infrared spectroscopy (FTIR) was performed in the absorption region of the carbonyl stretching vibration of the urazole ring.