科研之友
微信
新浪微博
Facebook
分享链接
摘要
5-Methyl-7-tert-butyl-3-(2hydroxyl-5-methylphenyl)3H-benzofuran-2-one (PCRBF2), is a better scavenger of 2,2-diphenyl-1-picrylhydrazyl radicals than benzofuranone analogs without the 2-substituent, which indicates that PCRBF2 will cause good stabilization in polymers. To prove this further, antioxidation by PCRBF2 and other benzofuranone analogs, namely, 5-methyl-7-tert-butyl-3-(3,4-dimethylphenyl)3H-benzofuran-2-one (OXBF2) and 5-methyl-7-tert-butyl-3-(2,5-dimethylphenyl)3H-benzofuran-2-one (PXBF2), was comparatively studied in polypropylene. The resulting antioxidant activity order of these benzofuranones was PCRBF2>OXBF2>PXBF2, an observation showing that the hydroxyl group in the 2-position does not weaken the antioxidant activity of benzofuranone, but, on the contrary, increases it. Analyses by FTIR revealed intramolecular hydrogen bonding between the 3-position hydrogen and the oxygen of the 2-hydroxyl group, which makes the 2-hydroxyl hydrogen of PCRBF2 more reactive than the 3-position reactive hydrogen. Thus the hydroxyl group reacts with radicals first. J. VINYL ADDIT. TECHNOL., 19:198-202, 2013.
- 出版日期2013-9
- 单位华东理工大学; 化学工程联合国家重点实验室
