Dr. Peng Wei Profile

Dr. Peng Wei

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Proceedings Article | 25 April 2023 Paper

Synthesis and antioxidation behavior of novel reactive macromolecular antioxidant

Qingkun Liu, Peng Wei, Chuanbo Cong, Qiong Zhou

Proceedings Volume 12598, 1259807 (2023) https://doi.org/10.1117/12.2672914

KEYWORDS: Molecular interactions, Thermal stability, Polymerization, Materials properties, FT-IR spectroscopy

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In this paper, the chemical reaction of pentaerythritol tetraacrylate (PET4A) and 2-mercaptobenzimidazole (MB) was carried out under the initiation of azodiisobutyronitrile, in which the thiol-acrylate Michael addition and the free radical polymerization of PET4A coexisted, and the reactive high molecular weight antioxidant denoted as PET4A@MB was synthesized. Due to the consumption of peroxide radicals by MB and residual acrylate in PET4A@MB, the vulcanization rate of PET4A@MB/EPDM is slowed down, and the crosslinking density becomes lower. Due to the large steric hindrance of PET4A@MB, the internal friction of the motion of the rubber molecular chain is increased, besides, due to the hydrogen bond formed by PET4A@MB, the interaction of the rubber molecular chain is increased, thereby improving the mechanical properties of the rubber. Since PET4A@MB is bonded to the rubber molecular chain, the migration of antioxidants at high temperatures is reduced, thereby improving the thermo-oxidative stability of the rubber.

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