Abstract
Antioxidants are normally utilized to extend the service life of polymers due to the strong reducibility of the phenolic hydroxyl group of the hindered phenol structure. Inspired by this characteristic, we have introduced green tea polyphenol (TP) supported on a silica surface containing considerable phenolic hydroxyl groups to obtain a novel biomass anti-aging filler (BAF, denoted as silica-s-TP) to reinforce and improve the anti-aging property of rubber composites. The applying of silica-s-TP to enhance the thermal-oxidative stability and ultraviolet light (UV) aging resistance of styrene-butadiene rubber (SBR) was evaluated. The hybrid biomass anti-aging filler could not only uniformly disperse in the rubber matrix, giving rise to the excellent mechanical properties, but also enhance the properties of thermal-oxidative stability and UV aging resistance with the increasing silica-s-TP content of SBR distinctly. This study provides a mild and environmentally friendly strategy to prepare the functional biomass filler, which could be applied as not only a reinforcement filler but also an anti-aging additive in “green rubber”.
Highlights
Polymeric materials aging is a crucial problem for its long period applications
The aims of this work are to prepare a novel hybrid biomass filler that could be applied as a kind of non-toxic anti-aging additive with excellent antioxidative and reinforcing properties for the “green rubber” industry
The spectrum for silica in the presence of characteristic peaks at 3440 cm−1 and 1630 cm−1 are, respectively, owned to the hydroxyl group stretching for silanol hydroxyls and the hydroxyl group bending of absorbed water on silica surface [27]
Summary
Polymeric materials aging is a crucial problem for its long period applications. Aging of polymeric materials tends to accelerate the destruction of the material’s properties, leading to a reduction in the service life and an increase in the consumption of resources and, under certain circumstances, can be catastrophic. A obvious example is the aging of rubber tires. Diene elastomers, such as natural rubber (NR), butadiene rubber (BR), and styrene-butadiene rubber, are important elastomers in modern industry [2,3]. For preventing oxidative aging of rubber material and prolonging its service life, anti-aging agents have been applied to inhibit and eliminate the free radicals. Some commercial anti-aging agents can play a role to a certain extent, but there are some shortcomings that limit its application, such as poor antioxidant efficiency, volatility, and easy migration.
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