To improve the hydrophobicity of bagasse hemicellulose-based films, glutaraldehyde was applied when preparing films of original and cationic bagasse hemicellulose with the addition of polyvinyl alcohol and sorbitol. The results showed that the cationic modification could increase the hydrophobicity of the hemicellulose-based film, and the hydrophobicity of hemicellulose-based films crosslinked with glutaraldehyde also increased. However, cationic modification of hemicellulose decreased the stress of the hemicellulose-based film. While crosslinking with glutaraldehyde increased the stress of both the original and cationic hemicellulose-based films. Macrophotography indicated that the film formability of the original hemicellulose was better than that of cationic hemicellulose. Through SEM observation, the degree of bonding of different components of the films was found to be increased due to crosslinking with glutaraldehyde. The crosslinking reaction between glutaraldehyde and hemicellulose was further confirmed by FT-IR spectroscopy.

In this study, natural bamboo fiber was prepared combining chemical pretreatment with mechanical disc refining, opening, and carding. An orthogonal experiment was designed based on four factors and three levels; thereafter, the manufacturing process was optimized. The length, diameter, tensile strength, and elastic modulus of the bamboo fiber were determined, and the crystallinity and morphology of the fiber were analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the optimum parameters for the chemical pretreatment were a cooking temperature of 130℃, heating time of 2 h, NaOH dosage of 2%, and Na₂SO₃ dosage of 10%. The cooking yield of bamboo chips was 89.5%, and the carding yield of natural bamboo fiber was 43.0% under the optimum conditions. The length, diameter, tensile strength, and elastic modulus of the obtained fiber were 36.71 mm, 0.285 mm, 407 MPa, and 27.7 GPa, respectively. XRD analysis and SEM observations showed that the technology used in this study can produce bright and compact natural bamboo fibers with high crystallinity.