二氧化碳基TPU/淀粉共混材料性能的研究

Study on properties of carbon dioxide-based TPU/starch blends

以二氧化碳基TPU和玉米淀粉为原料,通过运用转矩流变仪制备一种综合性能优异的二氧化碳基共混材料.运用扫描电子隧道、电子拉力机、转矩流变仪和高压毛细管流变仪,分别研究了不同淀粉含量、不同温度对二氧化碳基共混材料的力学性能和流变性能的影响.结果表明:淀粉含量的增加会使得共混材料的拉伸性能和撕裂性能出现先增大后减小,当淀粉含量为30%时综合力学性能最好;温度的上升,会使得共混物的表观剪切应力和表观切黏度降低;随着淀粉含量的增加,共混物的综合加工性能逐渐下降.

Carbon dioxide-based TPU and corn starch were used as raw materials to prepare a kind of carbon dioxide-based blend material with excellent comprehensive properties by using a torque rheometer. The effects of different starch content and different temperature on the mechanical properties and rheological properties of carbon dioxide based blendings were studied by using scanning electron tunnel, universal electronic testing machine,torque rheometer and high pressure capillary rheometer. The results show that the tensile properties and tearing properties of the blends increase first and then decrease with the increase of starch content. When the starch content is 30%,the comprehensive mechanical properties are the best.With the increase of temperature, the apparent shear stress and apparent shear viscosity of the blends decrease,and the comprehensive processing property of the blends decreases gradually with the increase of starch content.