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Synthesizing Hindered Structure Poly (p‐Phenylenediamine) by Enzymatic Catalysis and Evaluating Its Antioxidation Mechanism in Biodegradable Castor Oils
Author(s) -
Miao Changqing,
Wang Yanbo,
Ma Zhiying,
Luo Yang,
Miao Yu,
Yuan Pingfang,
Guo Jiao,
Chen Gairong,
Liu Hongbo
Publication year - 2021
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1002/aocs.12445
Subject(s) - differential scanning calorimetry , castor oil , chemistry , polymerization , monomer , gel permeation chromatography , fourier transform infrared spectroscopy , polymer chemistry , nuclear chemistry , organic chemistry , chemical engineering , polymer , physics , engineering , thermodynamics
In this study, poly( p‐ phenylenediamine) (PPDA) was synthesized by an enzymatic polymerization method using p‐ phenylenediamine as the monomer in the water phase. The PPDA structure was characterized by infrared (IR), gel permeation chromatography, and elemental analysis. The antioxidation behavior of the as‐synthesized PPDA in biodegradable castor oil was investigated using a rotary oxygen bomb test and pressurized differential scanning calorimetry. A theoretical calculation was conducted to investigate its antioxidation mechanism. PPDA was found to exhibit excellent oxidation resistance in castor oil at 150 °C, which effectively prolonged the oxidation induction time of the oil. The results obtained herein suggest that as with phenolic antioxidants, PPDA with a hindered structure effectively improves the antioxidation performance of the oil by enhancing the stability of nitrogen free radicals.