The biology treatment of cellulases or hemicellulases is used in this paper. The effects of cellulases and hemicellulases on surface wettability and gluing property of poplar and wheat straw were investigated. It was found that the surface contact angles of poplar and wheat straw were reduced and the surface free energies were increased after treatment by these enzymes. The gluing strengths of popular and wheat straw were enhanced with the increases of the dosage of enzymes and the time of enzymatic treatment.
This paper was to investigate basic properties of micro/ nano fibrils from poplar with a high pressure homogenizer. Their basic properties were tested by laser particle size analyzer, scanning electron microscopy (SEM) and X-ray diffractometer (XRD). The test results showed that if the fiber slurry moved from 20 to 40 circulations through the homogenizer, for 10% of the micro/nano fibrils, the particle size was reduced from 1.2 μm to 160 nm and its surface area per unit volume was increased from 1.63 × 104 to 8.38 × 104 cm2/cm3 when the concentration of fiber in suspension was 0.5% and the homogenization pressure was 800 bar. A distribution in the dimensions of the cellulose whiskers was seen by scanning electron microscopy. It was proved by X-ray diffractometer that the crystal degree of the micro/nano fibrils had a small change during the conversion process.
