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

In this paper we designed greener rubber nanocomposites exhibiting high crosslinking density, and excellent mechanical and thermal properties, with a potential application in technical fields including high-strength and heat-resistance products. Herein 1-ethyl-3-methylimidazolium acetate ([EMIM]OAc) ionic liquid was combined with silane coupling agent to formulate the nanocomposites. The impact of [EMIM]OAc on silica dispersion in a nitrile rubber (NBR) matrix was investigated by a transmission electron microscope and scanning electron microscopy. The combined use of the ionic liquid and silane in an NBR/silica system facilitates the homogeneous dispersion of the silica volume fraction (φ) from 0.041 to 0.177 and enhances crosslinking density of the matrix up to three-fold in comparison with neat NBR, and also it is beneficial for solving the risks of alcohol emission and ignition during the rubber manufacturing. The introduction of ionic liquid greatly improves the mechanical strength (9.7 MPa) with respect to neat NBR vulcanizate, especially at high temperatures e.g., 100 °C. Furthermore, it impacts on rheological behaviors of the nanocomposites and tends to reduce energy dissipation for the vulcanizates under large amplitude dynamic shear deformation.

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“…Crosslinking density (v c ) of NBR in the nanocomposites was calculated according to Flory-Rehner equation [44][45][46]…”

Section: Crosslinking Densitymentioning

confidence: 99%

Rheological and Mechanical Properties of Silica/Nitrile Butadiene Rubber Vulcanizates with Eco-Friendly Ionic Liquid

et al. 2020

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“…Besides, the absorption peaks appearing at 2,928 and 2,857

{c m}^{- 1}

in the spectra of silica‐A, silica‐T as well as silica‐TA correspond to the asymmetric and symmetric vibrations of methylene , indicating the TESPT is grafted on the silica surface of silica‐T and silica‐TA. When compared with pristine silica, the hydroxyl peak of silica‐A, silica‐T and silica‐TA downshift from 3,467 to 3,434

{normalc normalm}^{- 1}

, indicating the hydrogen bond between AMI and silica as well as that between TESPT and silica , which were displayed in Fig. .…”

Section: Resultsmentioning

confidence: 89%

“…Moreover, it has been reported that improved mechanical properties of SBR/silica composites can be achieved through using the ionic liquids, 1‐methylimidazolium mercaptopropionate or 1‐methylimidazolium methacrylate as coupling agent. Additionally, 1‐allyl‐3‐methyl‐imidazolium chloride (AMI) has been used to strengthen the interaction between silica and natural rubber . However, the interaction between silica and ionic liquid is usually weak non‐covalent interaction like hydrogen bonds, which results in restricted performance of rubber/silica composites.…”

Section: Introductionmentioning

confidence: 99%

Reinforcing styrene‐butadiene rubber composites by constructing multiple interaction between rubber and silica

Qian

Peng

2018

Polymer Composites

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Reinforcing rubber is of great significance in material science and engineering. In this work, a kind of ionic liquid, 1‐allyl‐3‐methyl‐imidazolium chloride (AMI) was used as compatibilizer in styrene‐butadiene rubber (SBR)/silica composites. AMI and bis(3‐triethoxysilylpropyl)‐tetrasulfide (TESPT) were used together to construct multiple interactions of covalent bonds, cation–pi interaction as well as hydrogen bonds between silica and SBR chains. After introducing TESPT and AMI, vulcanization rate of SBR/silica composites and crosslink density of the rubber vulcanizates increased obviously. Moreover, better dispersion of silica in SBR matrix as well as stronger interaction between silica and SBR chains was achieved. Additionally, the mechanical properties of rubber vulcanizates were improved remarkably compared with the vulcanizates with TESPT or AMI individually. When compared with only introducing one kind of interaction between silica and SBR to reinforce SBR/silica composites, this work of constructing multiple interactions between silica and SBR is of valuable reference in preparing high‐performance rubber/silica composites. POLYM. COMPOS., 40:1740–1747, 2019. © 2018 Society of Plastics Engineers

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“…It has been reported that the significant interfacial interactions between filler and rubber will lead to the formation of BRC . As a consequence, the BRC is usually used to measure the strength of interaction between filler and rubber chains …”

Section: Resultsmentioning

confidence: 99%

“…The weight of the samples before and after extraction was measured and the BRC was calculated according to the following equation:

Bound rubber % = \frac{w_{2} - w_{1} m_{f} / ((), m_{f} + m_{r})}{w_{1} m_{r} / ((), m_{f} + m_{r})} \times 100

where w 2 is the weight of sample after drying and w 1 is the weight of the sample before swelling. m f and m r are the fraction of filler and rubber in the compound, respectively . The results were averaged over three samples.…”

Section: Methodsmentioning

confidence: 99%

Silica nanoparticles reinforced natural rubber latex composites: The effects of silica dimension and polydispersity on performance

Xia

Song

Wang

et al. 2019

J of Applied Polymer Sci

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The nano‐size autonomous monodisperse silica (AS) particles were prepared by hydrolysis and condensation of tetraethoxysilane using l‐lysine as catalyst. The silica/natural rubber (NR) masterbatches were then produced via latex compounding, in which NR latex was mixed with the above AS dispersion. The commercial precipitated silica (PS) was introduced as a control. The effects of both AS and PS particles on the interfacial and mechanical properties of composites were systematically examined. It was found that the AS formed bead‐like morphology wherein the clear particle edges can be distinguished in rubber matrix. Compared with PS/NR, the AS/NR composites were proved to possess more bound rubber and weaker filler–filler interaction resulting in higher tensile strength, abrasive resistance, and resilience. Meanwhile, the efficiency of premodified AS and PS surfaces using bis‐(3‐triethoxysilylpropyl) tetrasulfide on reinforcing the properties of silica/NR composites was studied. The results presented that the overall properties of modified silica/NR vulcanizates were improved significantly. In special, the values of heating building‐up and compression set showed an evident decline which was of great significance for tire tread or other rubber products. For the dynamic properties, the magic angle spinning/NR composites had lower rolling resistance. In short, AS may be applied as an ideal substitution of PS in rubber. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47449.

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

Cited by 19 publications

References 41 publications

Rheological and Mechanical Properties of Silica/Nitrile Butadiene Rubber Vulcanizates with Eco-Friendly Ionic Liquid

Rheological and Mechanical Properties of Silica/Nitrile Butadiene Rubber Vulcanizates with Eco-Friendly Ionic Liquid

Reinforcing styrene‐butadiene rubber composites by constructing multiple interaction between rubber and silica

Silica nanoparticles reinforced natural rubber latex composites: The effects of silica dimension and polydispersity on performance

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