PP/高含量玉米淀粉材料的制备与力学性能研究

Preparation and Mechanical Properties of PP/High Content Corn Starch Composites

分别甩硅烷偶联剂、钛酸酯偶联剂A、钛酸酯偶联剂B、改性甘油C、改性甘油D以及甘油对玉米淀粉进行改性处理，研究了改性剂对PP／高含量淀粉材料的力学性能、形态以及界面的影响。结果表明，甘油与钛酸酯偶联剂A降低了材料的韧性，而改性甘油C对体系的韧性具有较好的改善效果。当改性甘油C相对于淀粉用量为1．5％、淀粉含量为50％时，PP／淀粉材料的断裂伸长率和冲击强度分别比PP／未改性淀粉体系提高了280％和17％。扫描电镜观察表明，改性甘油C不仅能改善淀粉的分散性，而且增加了淀粉与PP之间的界面作用力，具有增容作用。

Corn starch was treated separately using couple agents （titanate and organosilant）, glycerol, and chemically modified glycerol agents （C and D）. The mechanical properties and the interface morphology of PP/high content corn starch composites were investigated. At 50 wt % corn starch, which was modified with 1.5 wt % glycerol agent C, PP/corn starch blend exhibited the best mechanical properties, the elongation at break and the impact strength were nearly increased by 280 % and 17 %, respectively, in comparison with PP/coarse starch blend. SEM showed that glycerol agent C not only improved the dispersion of starch in PP, but also played an important role as a compatilizer, which enhanced the interface interaction between starch and PP.