改性木质素/PBAT复合包装膜的研究

Modified Lignin/PBAT Composite Packaging Films

目的将硅烷化木质素(SAL)与聚己二酸/对苯二甲酸丁二酯(PBAT)共混制备包装性能更为优良的SAL/PBAT复合包装膜,使其在包装领域应用更广。方法通过对木质素进行硅烷化改性,以咪唑作为中间体,将叔丁基二甲基氯硅烷(TBDMSCl)接枝到木质素的羟基上制备SAL,并将SAL与PBAT进行熔融共混吹塑成膜,探讨其对包装膜的力学和阻隔等性能的影响。结果与纯PBAT膜相比,SAL/PBAT复合包装膜拉伸强度提高了31.0%,断裂伸长率降低了37.4%,弹性模量提高了529.7%,氧气透过率降低了39.4%,水蒸气透过率降低了42.4%。结论改性木质素与PBAT复合能够产生协同效应,可以有效改善SAL/PBAT复合包装膜的力学和阻隔性能。

The purpose of this paper to enhance the packaging performance of poly(butylene adipateco terephthalate)(PBAT)packaging films by blending SAL with PBAT and broaden the application in packaging field.In this paper,alkali lignin was functionalized with tert-butyldimethylsilyl groups by the reaction with tert-butyldimethylsilyl chloride.Then SAL and PBAT were processed into blown films.The mechanical properties and barrier properties of the packaging films were discussed.Compared with the pure PBAT films,the tensile strength of SAL/PBAT composite packaging films in-creased by 31.0%,the elongation at break decreased by 37.4%,the elastic modulus increased by 529.7%,the oxygen transmittance decreased by 39.4%,and the water vapor transmittance decreased by 42.4%.Therefore,the composite of modified lignin and PBAT can produce synergistic effect,which can effectively improve the mechanical and barrier prop-erties of SAL/PBAT composite packaging films.