Multi-walled carbon nanotubes acting as antioxidant for fluorosilicone rubber. (October 2018)

• Record Type: Journal Article
• Authors: Guan, Yong; Yang, Rui; Huang, Yongkang; Yu, Chenchen; Li, Xiang; Wei, Dafu; Xu, Xiang
• Is Part Of: Polymer degradation and stability. Volume 156(2018)
• Page Start: 161
• Page End: 169
• Publication Date: 2018-10
• Subjects: Fluorosilicone rubber -- Multi-walled carbon nanotubes -- Antioxidant -- Degradation -- Radical scavenging -- Selectivity; Polymers -- Deterioration -- Periodicals; Stabilizing agents -- Periodicals; Polymères -- Dégradation -- Périodiques; Stabilisants -- Périodiques; 668.9
• DOI: 10.1016/j.polymdegradstab.2018.06.018
• Languages: English
• ISSNs: 0141-3910

Abstract

Abstract: A small addition amount (0.01–4 phr) of multi-walled carbon nanotubes (MWCNTs) were blended into fluorosilicone rubber (FSR) in order to improve its thermal aging properties, and the paper was investigated from three aspects: (1) the distribution of MWCNTs inside FSR was characterized using scanning electron microscope (SEM); (2) the thermal stability of FSR and FSR/MWCNTs was evaluated by the changes of mechanical performance and weight loss in the thermo-oxidative aging process, and the function mechanism of MWCNTs was studied by thermogravimetric analysis (TGA), chemiluminescence (CL), electron spin resonance (ESR) and fourier transform infrared spectroscopy (FTIR) measurements; (3) the vulcanization properties of FSR and FSR/MWCNTs were obtained from their vulcanization curves employing three kinds of peroxides as vulcanizers. The results showed MWCNTs, with a homogeneous distribution inside FSR, had significantly improved the antioxidant performance of FSR due to their powerful radical scavenging activity. Moreover, MWCNTs revealed no scavenging effect on the tert -butoxy radical, which ensured that FSR/MWCNTs could be well vulcanized. Highlights: A small addition amount (0.01–4 phr) of MWCNTs has significantly improved the thermal stability of fluorosilicone rubber. The antioxidant property of MWCNTs is attributed to their powerful radical scavenging activity. MWCNTs exhibit a high selectivity for scavenging different radicals. As a great antioxidant, MWCNTs can improve the thermal stability of elastomers without negative effects on their vulcanization.