Journal Article

Improving Thermal-oxidative Aging Resistance of Styrene-butadiene Rubber by Antioxidant Loaded Silica Aerogel

Liu, Fu-Yong, He, Hong-Wei, Wang, Yu, Yu, Wen-Wen, Zheng, Qiang, Ping, Xue-Fei, Wang, Pi, Liu, Lu

2024

Overview

The antioxidant N -isopropyl- N ′-phenyl- p -phenylenediamine (4010NA) was dissolved in ethanol and impregnated into silica aerogel (SAG) via vacuum-pressure cycles, yielding composite particles (A-N) with enhanced sustained-release and reinforcing capabilities. The effect of A-N on the mechanical properties and thermal-oxidative aging resistance of styrene-butadiene rubber (SBR) vulcanizates was investigated. TGA and BET assessments indicated that the loading efficiency of 4010NA in SAG reached 14.26% within ethanol’s solubility limit. Incorporating A-N into SBR vulcanizates significantly elevated tensile strength by 17.5% and elongation at break by 41.9% over those with fumed silica and free 4010NA. Furthermore, A-N notably enhanced the thermal-oxidative aging resistance of SBR. After aging for 96 h at 100 °C, the tensile strength and elongation at break of SBR with A-N sustained 70.09% and 58.61% of their initial values, respectively, with the retention rate of elongation at break being 62.8% higher than that of SBR with fumed silica and free antioxidant. The study revealed that A-N composite particles significantly inhibited the crosslinking in SBR’s molecular chains, reducing hardening and embrittlement during later thermal-oxidative aging stages.

• Publisher: Springer Nature Singapore,Springer Nature B.V
• Subject: Aging / Antioxidants / Butadiene / Characterization and Evaluation of Materials / Chemistry / Chemistry and Materials Science / Condensed Matter Physics / Crosslinking / Elongation / Ethanol / Industrial Chemistry/Chemical Engineering / Mechanical properties / Molecular chains / Oxidation resistance / Phenylenediamine / Polymer Sciences / Research Article / Rubber / Silica aerogels / Silica fume / Styrenes / Tensile strength / Thermal resistance