Effect of sodium alginate on properties of wheat straw/polylactic acid composites

To investigate the effect of sodium alginate (SA) on properties wheat straw/polylactic acid (PLA) composites, four kinds composites with different SA contents (0 wt%, 5 10 and 15 wt%）were prepared via injection molding. The mechanical properties, moisture absorption, thermal stability, infrared spectrum were tested analyzed, microstructure tensile section was observed scanning electron microscopy. degradability also analyzed. results showed that straw/PLA 5% had better properties. Their strength 15.8%, 5.4%, 19% higher than those 0%, 10%, 15% SA, respectively. impact changed to an acceptable degree relative non-SA which 28% lower 0% but 51.9% composite. less hygroscopicity adding enhanced composites. As content increased, increased greatly.