Structure effect of benzofuranone on the anti‐oxidation kinetics in polypropylene

Abstract

Benzofuranone compounds are used as chain-breaking antioxidants in the melt processing of polymers owing to their strong hydrogen donating ability. In this article, the structural effects of benzofuranone compounds on anti-oxidation in polypropylene (PP) were evaluated using oxidation onset temperature (OOT) of PP stabilised by the compounds in oxygen and the oxidation kinetics of the PP was studied using Ozawa and Kissinger methods, respectively. The results show that benzofuranone compounds inhibit the oxidative degradation of PP by increasing the oxidation activation energy, and the higher the oxidation activation energy of PP, the better the anti-oxidation activity of benzofuranone in PP. Furthermore, the anti-oxidation activity of benzofuranone compounds in PP is weakened by the methyl group in the 2 -position. Compared to benzofuranone compounds OXBF1 and TBF1 without 2 -position methyl group, PP stabilised by benzofuranone compound MXBF1 with 2 -position methyl group has lower OOT values and smaller oxidation activation energy. 

Experimental and computational thermochemistry of 6,7-dihydro-4(5H)-benzofuranone

“…Following our previous work with heterocyclic compounds [1][2][3][4][5], we present here a thermochemical study of 6,7-dihydro-4(5H)-benzofuranone. Benzofuranone derivatives show many different properties from antioxidant [6] to antibacterial activity against both Gram positive and Gram negative bacteria [7].…”