以苯甲酰氯为酯化剂制备酯化改性秸秆粉,通过红外光谱仪、接触角测量仪、扫描电镜、烘箱(探究高温褐变程度)对改性前后的秸秆粉进行结构及性质表征,并研究了不同反应条件对秸秆粉取代度的影响,之后进一步制备了基于改性前后秸秆粉和己二酸丁二醇酯-对苯二甲酸丁二醇酯共聚物(PBAT)的复合材料,并通过拉伸试验机对复合材料进行了拉伸性能检测。结果表明:秸秆粉内的还原糖上接入了苯环与酯基,疏水性提高,秸秆表面变粗糙,改性后的秸秆粉在高温下褐变程度降低,并通过取代度的计算得出了酯化秸秆粉的最佳反应条件,通过拉伸测试得出了复合材料拉伸强度与断裂伸长率都有提高。

Using benzoyl chloride as esterification agent,esterification modified straw powder was prepared.The structure and properties of the straw powder before and after modification were characterized by infrared spectrometer,contact angle measuring instrument,scanning electron microscope and oven (to explore the degree of high temperature browning).The effects of different esterification conditions on the substitution degree of straw powder were studied,and then a composite materials based on straw powder and PBAT before and after modification was further prepared.The tensile properties of this composite were tested by tensile test machine.The results showed that the benzene rings and ester groups were successfully added into the reducing sugars of the straw powder,its hydrophobicity went up,the surface of the straw powder became rough,and the browning degree of the modified straw powder decreased at high temperature.The optimum reaction condition of esterified straw powder was obtained by calculating the substitution degree.The tensile test results demonstrated that the tensile strength and elongation at break of the composite were all improved.