The inhibition of the thermal oxidative degradation of polypropylene by various phenanthrols

摘要

AbstractAll isomers of phenanthrol, 1‐, 2‐, 3‐, 4‐, and 9‐phenanthrol, were prepared and the inhibitory effect of these compounds on the thermal oxidative degradation of isotactic polypropylene was examined by conventional oxygen uptake. The phenanthrols were found to be much more effective antioxidants than commercial 2,6‐di‐tert‐butyl‐4‐methyl‐phenol (abbreviated as BHT), and phenanthrene itself hardly showed any inhibitive effect. The effect of the phenanthrols was largely dependent on the position of the hydroxy group; the order of the effect was as follows: 1‐4‐2‐3‐9‐phenanthrol>BHT. The phenanthrols were also good inhibitors of the radical polymerization of methyl methacrylate, and a fairly good correlation was observed between oxygen uptake