材料期刊网

为探讨阻湿剂氯化石蜡、甘油对麦秸秆/植物蛋白胶复合材料阻湿性能、微观结构及化学结构的影响,采用热压成型方法制得添加2种阻湿剂的复合材料。分别测试麦秸秆/植物蛋白胶复合材料的力学性能、吸水率和吸湿率变化,采用 FTIR分析其官能团的变化,测试接触角分析其润湿性能,并用体视显微镜观察分析复合材料弯曲断面微观结构。结果表明：添加氯化石蜡麦秸秆/植物蛋白胶复合材料弯曲强度、弯曲弹性模量最大,比未添加复合材料分别提高67%、129%,添加甘油麦秸秆/植物蛋白胶复合材料冲击强度较大,比未添加复合材料提高44%；添加氯化石蜡和甘油麦秸秆/植物蛋白胶复合材料2 h吸水厚度膨胀率小于未添加复合材料；随着吸湿时间的增加,3种复合材料吸湿率均呈上升趋势,其中添加氯化石蜡麦秸秆/植物蛋白胶复合材料吸湿平衡率最小为4.3%；添加氯化石蜡麦秸秆/植物蛋白胶复合材料的弯曲断面微观结构较好,内部结合紧密,表面纤维暴露较少,阻湿性最好。

In order to investigate the influence of moisture resistance agents chlorinated paraffin and glycerol on the moisture resistance,microstructure and chemical structure of wheat straw/vegetable protein adhesive composites, composites added with two moisture resistance agents were prepared by hot pressing molding method.The mechani-cal properties,water and moisture absorption rate variation of wheat straw/vegetable protein adhesive composites were measured respectively,and the functional group variations were analyzed by FTIR.The wettability was ana-lyzed by testing contact angles,and the bending cross-section microstructure of the composites was observed by the stereo microscope.The results show that the maximum bending strength and bending elastic modulus of wheat straw/vegetable protein adhesive composites adding chlorinated paraffin increase by 67% and 129% respectively compared with those of wheat straw/vegetable protein adhesive composites without additive.The maximum impact strength of wheat straw/vegetable protein adhesive composites adding glycerol increases by 44% compared with that of wheat straw/vegetable protein adhesive composites without additive.The 2 h thickness swelling rate of water ab-sorption of the wheat straw/vegetable protein adhesive composites adding chlorinated paraffin and glycerol are gener-ally smaller than that of composites without additive.With the moisture absorption time increasing,the moisture absorption rate of three composites increases,and the smallest rate of balanced moisture absorption of wheat straw/vegetable protein adhesive composites adding chlorinated paraffin is 4.3%.The bending cross-section microstructure of wheat straw/vegetable protein adhesive composites adding chlorinated paraffin is better than that of other com-posites,the inner surface is integrated tightly and the surface of the fiber is less exposed and the moisture resistance is the best.