Preparation and Properties of Carrageenan/Straw Lignin Composite Film
In order to improve the utilization value of straw,a series of carrageenan/straw lignin composite films(C/L composite films)with different SL contents were prepared by extracting lignin from straw(SL)mixed with carrageenan and sorbitol.The effects of lignin amount within the film on the structure and performance were studied through structure characterizing and performance testing of the film.The results showed that SL can effectively enhance the mechanical properties of the film,improve its hydrophobicity,in-crease its haze,and endow the film with antioxidant and UV shielding properties,but it had little effect on the thermal stability of the film.The film exhibited a uniform and dense structure at the SL addition above 8%,proving a better compatibility between them.And FTIR results indicated the hydrogen bond was the main combining force.The film blocked almost all UV light when the addition amount of SL was 10%.When the addition amount of SL was 12%,the mechanical properties of the film were the best,with a tensile strength of 22.97 MPa and elongation at break of 30.40%.When the addition amount of SL was 14%,hydrophobicity of the film was the best,with a minimum water vapor permeability value of 6.78×10-11 g m-1 s-1 Pa-1,contact angle of water increased from 28° to 79°.The antioxidant capacity of the film increased with the increase of SL addition amount.The DPPH(1-1-Diphenyl-2-Picrylhydrazyl radi-cal)radical scavenging rate of the prepared films enhanced from 0 to 23.39% as the SL addition was 16%.
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