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Synthesis and application of new macromolecular hindered phenol antioxidants of polyamide 6
Author(s) -
Jiang Siyuan,
Liu Yufei,
Zou Xiaoyu,
He Min,
Zhang Kai,
Xu Guomin,
Qin Shuhao
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.51184
Subject(s) - thermogravimetric analysis , differential scanning calorimetry , thermal stability , gel permeation chromatography , macromolecule , crystallization , polymer chemistry , dynamic mechanical analysis , polyamide , fourier transform infrared spectroscopy , chemistry , materials science , polymer , chemical engineering , organic chemistry , biochemistry , engineering , physics , thermodynamics
The two macromolecular antioxidants, P(3,5‐di‐tert‐butyl‐4‐hydroxy cinnamic acid‐alt‐N‐phenylmaleimide) (PCN) and P(3‐butene‐1‐yl‐3,5‐di‐tert‐butyl −4‐hydroxyphenyl propionate‐alt‐N‐phenylmaleimide) (PPN) were designed and synthesized via free radical copolymerization. The structures of the resulting PCN and PPN antioxidants were characterized by Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy ( 1 H NMR), and gel permeation chromatography. In addition, the effect of the two macromolecular antioxidants on the thermal oxidation aging resistance of polyamide 6 (PA6) was studied. According to the analysis of differential scanning calorimetry, thermogravimetric analysis, dynamic mechanical analysis, dynamic viscosity, and the mechanical property of PA6 and its blends, these two types of macromolecular antioxidants protected the molecular chain of PA6 from breaking, protected the crystallization of PA6 and maintained the stability of PA6 crystal form, improved the activation energy of thermal degradation and thermal stability of PA6, enhanced the strength and elasticity of PA6 and maintained the mechanical properties of PA6 during aging to a certain extent.