SBR/silica composites modified by a polymerizable protic ionic liquid

Abstract

A novel functionalized ionic liquid, 1-methylimidazolium sorbate (MimS), was synthesized and characterized. MimS was used to improve the performance of rubber/silica composites. Substantiated hydrogen bonding between MimS and silica was responsible for effectively restraining the Payne effect and decreasing the Mooney viscosity of the uncured rubber compounds. The reactivity of MimS toward rubber and its ability to hydrogen bond with polymerized MimS and silica were characterized. Filler networking, curing behavior, silica dispersion and mechanical performance of the vulcanizates were fully studied. Remarkable improvements in mechanical properties were achieved with only a small addition of MimS. Variations in rubber performance were attributed to the significantly improved silica dispersion and novel interfacial interactions induced by MimS.

Influence of ionic liquid on the polymer–filler coupling and mechanical properties of nano‐silica filled elastomer

“…It is believed that the double bonds in the AMI molecules are chemically linked with the double bonds of NR chains by sulfur bridges . However, when the content of AMI is more, the self‐polymerization of excess AMI may consume part of vulcanizing agent, which leads to the decrease of the Δ S . This result is in good agreement with the XLD , which is shown in following section (Table ).…”

“…It is because A x SiO 2 disperses well throughout the matrix, which provides more physical entanglement points and effective chemical crosslink points, leading to increase in G e and G c , which can also answer for the enhanced mechanical properties of NR nanocomposite filled with A x SiO 2 . When the content of AMI is more, the self‐polymerization of excess AMI may consume part of vulcanizing agent, leading to decrease effective chemical crosslink points . Therefore, the ( G e + G c ) declines.…”

“…Ionic liquids have attracted wide attention due to their negligible vapor pressure, high thermal, and chemical stability as well as their designable characteristics . They have been demonstrated to be interactive towards numerous fillers, such as carbon nanotubes, silica, and carbon black . For example, Kreyenschulte et al .…”

Synthesis of novel functional liquid and its application as a modifier in SBR/silica composites

“…However, due to the limited compatibility toward rubber [27][28][29] and the environmental unfriendliness of the fluorine containing anions [30], these two factors deter the common ILs such as 1-butly-3-methylimidazole hexafluorophosphate (BmimPF 6 ) from their corresponding promising applications in modifying rubber/filler composites. Previously, we have confirmed that, via special treating methods, such as solution dispersion, mechanical grinding or microwave irradiation treatment, BmimPF 6 could not only influence surface properties of rubber fillers, but also improve the mechanical performance of the filled polymer materials [31][32][33]. However, an excess loading of BmimPF 6 proved to be unacceptable because of its poor interaction toward rubber chains and its high economic cost.…”

Promoted dispersion of silica and interfacial strength in rubber/silica composites by grafting with oniums

“…Such tendency can be further illustrated by the TEM observations. This is because the grafted imidazolium cations on MR interact with surface silanols of silica via hydrogen bonding interaction, which consequently improves interfacial interaction and depresses silica aggregation . Moreover, bound rubber test shows that the incorporation of MR leads to a consistently increase of bound rubber content, suggesting the improved interfacial interaction (Table ).…”