Surface Modification of the Cellulose Nanofiber Extracted from Wood Powder

抄録

Wood powder, after chemical removal of lignin and hemicellulose, was mechanically disintegrated into cellulose nanofiber. Focused on piezoelectricity, polarized optics and other applications with isotropic media, we attempted two different modifications (cyanoethylation and cyanoethylated dihydroxypropylation) of the nanofiber surfaces to decrease interfibrillar hydrogen bonds to enable uniaxial elongation and isotropic film orientation. Synthesized surface cyanoethylated cellulose nanofiber has no glass transition near the room temperature and was difficult to elongate uniaxially. Cyanoethylated dihydroxypropylcellulose nanofiber was viscoelastic at the room temperature with a piezoelectric constant of d₁₄=3.2 pm/V.