Antiradical Ability of Dendrimer‐Bridged Hindered Phenol and Its Antioxidant Property in Polyolefin. Issue 24 (22nd August 2017)

• Record Type: Journal Article
• Authors: Li, Cuiqin; Zhai, Xue; Guo, Suyue; Li, Huanyu; Sun, Peng; Wang, Hua; Wang, Jun
• Is Part Of: ChemistrySelect. Volume 2:Issue 24(2017)
• Page Start: 7202
• Page End: 7209
• Publication Date: 2017-08-22
• Subjects: Antioxidant -- Antioxidant ability -- Dendrimer -- Free radical -- Hindered phenol; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201701114
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Antiradical abilities of 1.0 generation dendrimer bridged hindered phenols (1.0G dendritic phenols) are studied by the DPPH method and antioxidant properties in polyolefin are evaluated by melt flow rate (MFR), oxidation induction time (OIT) and accelerated thermal aging test. The results indicate that the antioxidant properties are affected not only by the chemical structure but also by the reaction system for series of 1.0G dendritic phenols. The antiradical ability decreases with increasing of the length of the bridged group of 1.0 G dendritic phenols, and the antiradical abilities at steady state reaction time are better than those at fixed reaction time of 30 min. The reaction of 1.0G dendritic phenols scavenging DPPH free radical belongs to slow kinetic behavior. And 1.0G dendritic phenols have excellent processing property, oxidation resistance behavior and thermo‐oxidative aging resistance in linear low density polyethylene (LLDPE) and polypropylene (PP). The OIT values and the aging coefficient values of polyolefin stabilized with 1.0G dendritic phenols increase with increasing of the length of the bridged group of 1.0G dendritic phenols. The antioxidant abilities 1.0G dendritic phenols in LLDPE are superior to those in PP. Abstract : Antiradical abilities of 1.0 generation dendrimer‐bridged hindered phenols (1.0G dendritic phenols) on DPPH free radical are studied and antioxidant properties in polyolefin are evaluated. Series of 1.0G dendritic phenols have good antioxidant properties. Tthe reaction of 1.0G dendritic phenols scavenging DPPH free radical belongs to slow kinetic behavior. Their antiradical abilities decrease and the antioxidant abilities in polyolefin increase with increasing of the length of the bridged group of 1.0G dendritic phenols.