Features and Developments of Phosphorylated Cellulose Nanofibers

Sato Miho

doi:10.2524/jtappij.78.103

Recently, woody biomass is expected to be used in multiple ways as a carbon-neutral and renewable resource. Among them, cellulose nanofibers （CNFs） are attracting attention as a new nanomaterial derived from cellulose, one of the major components of trees. We have established a unique CNFs production method by introducing phosphate groups to the hydroxyl groups in wood pulp and mechanically processing the resulting phosphorylated pulp. The obtained phosphorylated CNFs were completely nanofibrillated （about 3 nm in width） with high yield, and their aqueous dispersion was highly transparent, viscous, and stable at pH 3-11. The aqueous dispersion of phosphorylated CNFs can be dehydrated and dried to form transparent CNFs sheet with densely-packed CNFs. This sheet has high transparency, strength, and thermal dimensional stability, and at the same time, it has paper-like flexibility. To promote the practical use of this technology, we have currently been developing the new composite of CNFs and polymer materials. Natural rubber, polycarbonate, and polypropylene have been successfully composited with CNFs. These composites showed the specific mechanical and thermal properties and have the potential to replace commercialized products. We will continue to develop the use of cellulosic materials in composites while taking advantage of the features of phosphorylated CNFs.

Features and Developments of Phosphorylated Cellulose Nanofibers

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