热氧老化对麦秸秆/橡胶/PE仿藤条性能的影响

Effects of Thermal Oxidative Aging on Wheat Straw/Rubber Biomass Imitation Rattan

秸塑复合材料(SPC)是一种使用秸秆纤维替代木材纤维的新型木塑复合材料。以麦秸秆和低密度聚乙烯为原料,利用天然橡胶增韧的特性开发出了麦秸秆/橡胶生物质仿藤条。在100℃条件下加速热氧老化60天,观察分析其力学性能和微观结构的变化规律。结果表明,初始条件下,一方面麦秸秆纤维的加入降低了仿藤条的力学性能;另一方面橡胶的加入增强了仿藤条的韧性,起到了弥补作用。老化过程中,材料表面出现裂纹,生物质和PE界面的结合官能团丧失,界面结合能力降低,力学性能下降。结合动力学模型,0~15天为快速降解阶段,材料断裂伸长率降低较快,橡胶的加入降低了老化速率,老化系数降低了70%。含有橡胶的仿藤条在15~60天的老化过程中保持较低的老化速率,起到了抗老化作用。

Straw plastic composite(SPC)is a novel wood-plastic material in which wood fibers are replaced by straw fibers.Wheat straw/rubber biomass imitation rattan from wheat straw,rubber and low density polyethylene(LDPE)was prepared.The changes of mechanical properties and microstructures were investigated in the period of thermal-oxidative aging at 100℃for 60 d.The results showed that the addition of wheat straw fiber will reduce the mechanical properties while the rubber can enhance the elongation break.During the aging process,cracks appearing on the surface of rattan cut down mechanical properties.And the losing of functional groups between the surface of straw fiber and PE caused the reduction of combining ability.In combination with the kinetic model,the degradation occurred rapidly in the beginning of the 15 days with the aging coefficient up to 70%and kept a low rate in the rest of the experiment.Furthermore,the addition of rubber could slow down the aging rate of rattan.