Microcrystalline cellulose might replace silica in tyres - Researcher

ERJ staff report (DS)

Corvallis, Oregon -- Wood science researchers at Oregon State University have discovered that microcrystalline cellulose could partially replace silica as a reinforcing filler in the manufacture of tyres. They add that microcrystalline cellulose can be made easily from almost any type of plant fibres.

Microcrystalline cellulose is a micrometer-sized type of crystalline cellulose with a well-organised structure. It is produced in a low-cost process of acid hydrolysis using an abundant and sustainable natural polymer - cellulose.

A new study suggests that this approach might decrease the energy required to produce the tyre, reduce costs, and better resist heat buildup. Early tests indicate that such products would have comparable traction on cold or wet roads, be just as strong, and provide even higher fuel efficiency than traditional tyres in hot weather.

In this study, OSU researchers replaced up to about 12 percent of the silica used in conventional tyre manufacture. This decreased the amount of energy needed to compound the rubber composite, improved the heat resistance of the product, and retained tensile strength.

The study showed that wet traction of the new product was comparable to existing rubber tyre technology in a wet, rainy environment. However, at high temperatures such as in summer, the partial replacement of silica improved the rolling resistance of the product, which would improve fuel efficiency of tyres made with the new material.

“We were surprised at how favourable the results were for the use of this material,” said Kaichang Li, an associate professor of wood science and engineering in the OSU College of Forestry, who conducted this research with graduate student Wen Bai.

The newest findings were just published in a professional journal, Composites Part A: Applied Science and Manufacturing.

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Article abstract from Composites Part A: Applied Science and Manufacturing

Press release from OSU