Abstract
Starch/PBAT blown films with high ultraviolet aging resistance and excellent mechanical properties were prepared by introducing lignin with polyurethane prepolymer (PUP) as a starch modifier and physical compatibilizer and 4,4′–methylene diphenyl diisocyanate (MDI) as a crosslinker. Starch was modified by reacting the NCO groups of the PUP with the OH groups of the starch to form a carbamate bond. The mechanical properties, hydrophobic properties, ultraviolet barrier, ultraviolet aging properties and microscopic morphology of starch/PBAT films with different contents of lignin were investigated. The results showed that the starch/PBAT films were blown continuously. The addition of lignin did not decrease the mechanical properties. On the contrary, the film with 1% lignin possessed the excellent mechanical properties with longitudinal tensile strength of 15.87 MPa and the elongation at a break of 602.21%. In addition, the higher the lignin content, the better the UV blocking effect. The introduction of lignin did not affect the crystalline properties but improved the hydrophilic properties and sealing strength of the high starch content composite films.
Highlights
Plastics are widely used in packaging, isolation and mulch due to their low cost, high mechanical properties and easy processing characteristics [1]
The results showed that the addition of lignin slightly improved the heat-seal performance of starch/PBAT film, which was mainly due to the rigidity of lignin
Starch/PBAT films with high ultraviolet aging resistance and excellent mechanical films with continuously high ultraviolet aging resistance and excellent mechanical properties were successfully blown by introducing lignin with polyurethane properties were successfully continuously blown by introducing lignin with polyurethane prepolymer (PUP) as a starch modifier and physical compatibilizer and 4,4 -methylene prepolymer (PUP) as a(MDI)
Summary
Plastics are widely used in packaging, isolation and mulch due to their low cost, high mechanical properties and easy processing characteristics [1]. Mulch films play an important role in inhibiting the growth of weeds, improving water use efficiency and increasing crop yields in modern agriculture [2]. Conventional mulch films, mainly composed of polyethylene or polyvinyl chloride, are non-degradable and derived from non–renewable petroleum. Their excessive usage may result in the accumulation of solid waste and deteriorating environment seriously [3,4]. A large amount of residual film remains in the soil, which leads to a decrease in soil moisture and nutrient permeability and is not conducive to crops [5]. Under the promotion of national policies, the emergence of biodegradable mulch will effectively solve the problem of residual pollution of non-degradable mulch
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