摘要
Abstract
Xylanase was used as the catalytic enzyme to modify bamboo powder.The enzyme-catalyzed modified bamboo powder was used as a reinforcing filler,and polylactic acid(PLA)was used as the matrix to prepare enzyme-catalyzed modified bamboo powder/PLA composites.The properties of the enzyme-catalyzed modified bamboo powder/PLA composites were analyzed using scanning electron microscopy(SEM),Fourier-transform infrared spectroscopy(FTIR),thermogravimetric analysis(TG),and universal testing machine.The results of SEM,FTIR,and TG indicated that with the increase in the mass concentration of xylanase,the surface of the bamboo fibers in the bamboo powder became rougher,and the number of surface hydroxyl groups decreased.This made it easier for the bamboo powder to combine with PLA,which is beneficial for enhancing the thermal stability of the bamboo powder/PLA composites.Mechanical testing results showed that compared with the bamboo powder/PLA composites without enzyme-catalyzed modification,the mechanical properties of the enzyme-catalyzed modified bamboo powder/PLA composites were significantly improved.When the mass concentration of xylanase was 3 mg/L,the tensile strength,compressive strength,bending strength,and impact strength of the enzyme-catalyzed modified bamboo powder/PLA composites reached 42,2 631,68 MPa,and 0.83 kJ/m²,respectively.关键词
酶催化/聚乳酸/竹粉/复合材料/塑料Key words
Enzyme catalyzed/Polylactic acid/Bamboo powder/Composites/Plastics
