1,2,3,4-Tetraphenylcyclopentadiene triphenyl stibonium ylide initiated radical polymerization of N-vinyl pyrrolidone (N-VP) in dioxane, at 60±0.2 • C, for 60 min under nitrogen atmosphere has been carried out. The system follows ideal kinetics, i.e., R p ∝ [ylide] 0.5 [N-VP] 1.0 . The values of k 2 p /k t and overall energy of activation have been computed as 0.5 × 10 −2 l mol −1 s −1 and 33 kJ/mol, respectively. The FT-IR spectrum shows a band at 1692 cm −1 due to the C O group of N-vinyl pyrrolidone. The 1 H-NMR spectrum shows multiplet at 2.4 δ ppm and a doublet at 3.7 δ ppm due to CH 2 protons. The DSC curve shows a glass transition temperature (T g ) as 48 • C.The presence of six hyperfine lines in the ESR spectrum indicates that the system follows free radical polymerization and the initiation is brought about by phenyl radical.

1,2,3,4-Tetraphenylcyclopentadiene triphenyl stibonium ylide initiated radical polymerization of n-butyl methacrylate (n-BMA) in dioxane at (60 6 0.2)8C for 90 min under nitrogen atmosphere has been carried out. H NMR spectrum shows a peak of two magnetically equivalent protons of methylene group at 2.1 d ppm. The DSC curve shows glass transition temperature (T g ) as 418C. The presence of six hyperfine lines in ESR spectrum indicates that the system follows free radical polymerization and the initiation is brought about by phenyl radical.