Photo‐oxidative degradation and stabilization of isotactic poly(1‐butene) in solid state, 1

The kinetics of photo‐oxidative degradation and stabilization of poly(1‐butene), [poly(1‐ethylethylene), PB‐1] at 253, 7 nm and a constant intensity of 2,38·10−9 Einstein.s−1·cm−2 (1,12·10−3 J·mol−1·s−1·cm−2) was studied in the absence and presence of 0,1 wt.‐% 6‐(2‐hydroxyphenyl)‐2,4‐diphenyl‐1,3,5‐triazine (1) dispersed evenly in the matrix of polymer films in the temperature range of 267 to 313 K. The progress of the reaction was followed by measuring the rate of chain scission of the polymer. It has been confirmed by light scattering and potassium ferrioxalate actinometric measurements that random scission of the polymer chain occurs and 1 acts as a stabilizer to the photo‐oxidative degradation processes. Irrespective of the variations in the values of ΔH≠ and ΔS≠ the values of ΔF≠ remain almost constant around 159 kJ·mol−1 indicating that the rate determining step is the same for both systems.