Oxidative copolymerization of indene with p‐tert‐butylstyrene: Synthesis, characterization, thermal analysis, and reactivity ratios.

Abstract

Copolyperoxides of indene and p-tert-butylstyrene of different compositions were synthesized by free-radical-initiated oxidative copolymerization. The compositions of the copolyperoxides, obtained from ¹H and ¹³C NMR spectra, were used to calculate the reactivity ratios of the monomers. The reactivity ratios indicated a larger proportion of indene units in random placement in the copolyperoxides. Thermal-degradation studies by differential scanning calorimetry and electron-impact mass spectrometry supported alternating peroxide units in the copolymer backbone. The activation energy for thermal degradation suggested that the degradation was dependent on the dissociation of the peroxide (–O–O–) bonds in the backbone of the copolyperoxide chain. The flexibility of the copolyperoxides was examined in terms of the glass-transition temperature.