Crosslinking enhancement and UV resistance of cellulose film.

In order to improve the mechanical properties of cellulose films, chemical crosslinking was used to enhance cellulose films: A high strength cellulose film with a certain UV resistance was prepared by phase conversion with cellulose /DMAc-LiCl solution as casting solution and p-Xylylene dichloride as crosslinking agent, following etherification reaction for crosslinking in NaOH aqueous solution. The synthesized film was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), X-ray diffraction (XRD). The results showed that the content of crosslinking agent played a decisive role in the strength of cellulose film. With increasing the amount of crosslinking agent, the original amorphous structure of cellulose was destroyed and a new crystalline Wffflh higher degree of crystallization was formed. The mechanical properties test showed that the cellulose film with best mechanical properties could be prepared when the crosslinking agent was 1:0.125 (molar ratio of--OH : --Cl), the concentration of NaOH was 0.1 mol/L, and the reaction time was 3 h. The tensile strength of the plain film can be increased by 102%, the modulus of elasticity by 32% and the elongation at break by 210%. The mechanical strength of unmodified cellulose films irradiated by ultraviolet light decreased by 24.6%. With the increase of cross-linking agent content, the tensile strength of cellulose films decreased by 16.8%-2.45%. It was proved that the modified cellulose films had certain ultraviolet resistance. [ABSTRACT FROM AUTHOR]