生物基CNC/PCNF/LNPs柔性虹彩薄膜的疏水抗紫外性能OA

[Objective]This study aims to prepare a fully biobased composite film with flexible iridescent cellulose nanocrystals(CNC)/phosphorylated cellulose nanofibers(PCNF)/lignin nanoparticles(LNPs),and systematically examine the influence of LNPs mass fraction on the optical properties,morphology,mechanical properties,humidity sensitivity,thermal stability,hydrophobicity,and ultraviolet shielding properties of the composite film.[Method]Taking CNC as the structural matrix,PCNF as the reinforcing phase,and LNPs as the functional component,a two-step method was employed to prepare a fully biobased,flexible,and iridescent CNC/PCNF/LNPs composite film.[Result]The structural color and the maximum reflection wavelength(λmax)of the film exhibited a significant redshift with increasing LNPs mass fraction.Hydrophobicity was enhanced,and the water contact angle increased from 39.0° to 76.1°,while humidity sensitivity decreased s lightly.Thermal stability improved,with the maximum thermal decomposition temperature rising from 240℃to 261℃.Ultraviolet shielding performance was enhanced,and the CNC/P20/L2.0 film(where P20 represented the mass fraction of PCNF relative to CNC as 20.0%,and L2.0 represented the mass fraction of LNPs relative to CNC as 2.0%)achieved UV absorption rates of 95.8%in the ultraviolet region(UV,200-400 nm)and 99.2%in the mid wave UV region(UVB,280-320 nm).[Conclusion]The mass fraction of LNPs can affect the optical properties,morphology,humidity sensitivity,thermal stability,hydrophobicity,and ultraviolet shielding properties of the composite film,but it has little effect on the mechanical properties.