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This study adopted a casting film-forming method to prepare composite films with degradable cellulose nanocrystal (CNC) as the reinforcing filler, and polyvinyl alcohol(PVA) as the matrix. The silanization modification of CNC (S1-CNC, S2-CNC, S3-CNC) was carried out by adding different mass of γ-Aminopropyltriethoxysilane (KH-550), and the effect of adding different S-CNC on the properties of composites was studied. The experimental results show that, compared with the PVA film, the composite film with CNC and S-CNC has a rougher section and poorer light transmittance. The elongation at break of the S1-CNC/PVA film is the largest, which is 120.6%, which is 285% higher than that of the PVA film. The tensile strength of S1-CNC/PVA is the largest, which is 14.02 MPa, which is 21.6% higher than that of PVA film. The contact angles of PVA, CNC/PVA, and S1-CNC/PVA films were 51°, 27.5°, and 56°, respectively. It can be seen that CNC is hydrophilic, and silanization modification will reduce the hydrophilicity of CNC. The weight loss range of PVA film was different from that of CNC/PVA film and S1-CNC/PVA film, indicating that adding CNC or S1-CNC would improve the thermal stability of the composite.

Preparation and properties of silanation-modified nanocellulose-reinforced polyvinyl alcohol nanocomposites