A novel material based on deep eutectic solvents and its application in in‐situ modified silica‐reinforced styrene‐butadiene rubber

Abstract

In the tread compound of Green tire, silica dispersity is critical for obtaining high-performance rubber composites. Ionic liquids have been successfully applied in improving the dispersity of silica through chemical and physical interaction. However, recent research has found that ionic liquids are harmful to the ecological environment. Meanwhile, the price of them is high. In this paper, the deep eutectic solvents (DESs-Choline Chloride: urea) was synthesized successfully. Then it was directly introduced to prepare silica-filled styrene-butadiene rubber (SBR) compound via an in-situ method. The carbonyl group and amino in DESs could constitute a hydrogen bond with the silanol on the silica surface.The hydroxyl groups were able to react with the silanol groups. The amino groups in DESs could treat as a secondary facilitator, which accelerated the curing rate. The results showed that DESs improved the dispersity of silica effectively and strengthened the interaction between silica and SBR chains.Particularly, the comprehensive performance of the rubber vulcanizates improved with an optimal ratio of bis(3-triethoxysilypropyl)-tetrasulfide (TESPT) to DESs being of 1:1. In addition, the DESs will serve as a novel material in silica-filled SBR composites, which will expand its application in the tire industry.

Effect of 1‐ethylpyridinium bromide on enhancing the dispersion of silica and interfacial strength in rubber‐silica composite

“…These results illustrate that during the vulcanization process, ionic liquids can be crosslinked with rubber molecular chains through covalent or physical bonds, thereby retaining the elasticity of the rubber as well as its electrical conductivity. These studies demonstrate that ionic liquids can form physical and chemical bonds with the silica surface or rubber chains, thereby enhancing the interaction between the rubber and the filler 21,22 …”

“…These studies demonstrate that ionic liquids can form physical and chemical bonds with the silica surface or rubber chains, thereby enhancing the interaction between the rubber and the filler. 21,22 Besides, Maciejewska and her colleagues conducted extensive research on the dispersion of various fillers by ionic liquids and investigated how ILs facilitate vulcanization. Maciejewska et al 23 modified three fillers (hydrotalcite, cellulose, and silica) using different brominated ILs with different cations.…”

Preparation and performance of natural rubber latex treatment for silica filled natural rubber composites

“…The strength of the "Payne effect" (expressed by ΔG 0 ) can also explain the interaction of fillers: the smaller the "Payne effect" is, the weaker the interaction. 16,30 The trend of ΔG 0 of the rubber composites with 40 phr silica filler displayed in Figure 4b shows The "Payne effect" of N/N-SiS40 is the weakest, indicating that Si69 and NRL treatment can reduce the interaction of the silica filler. With the increase of silica, ΔG 0 increases gradually.…”