通过添加聚乙烯醇( PVA)、二氧化硅( SiO2)到木薯淀粉中,采用熔融密炼法制备热塑性木薯淀粉( TPS)/PVA/SiO2共混材料,研究共混材料的吸水性、生物降解与熔融行为。研究结果表明：随着SiO2用量的增加, TPS/PVA/SiO2共混体系的吸水率增加, TPS/PVA (1799)/SiO2共混材料的吸水率高于 TPS/PVA (1788)/SiO2共混物。表面改性后SiO2的TPS/PVA/SiO2共混物的吸水率低于未改性SiO2。随着SiO2用量的增加,TPS/PVA/SiO2共混物的生物降解降低,共混物的熔融峰增高,而熔融焓降低。
The thermoplastic tapioca starch( TPS)/PVA/SiO2 blends were prepared through melt mixing meth-od,by adding polyvinyl alcohol(PVA),silica(SiO2)into cassava starch,and the water absorption,biodegradation, and melting behavior of the blends were investigated. The research results indicated that with the increase of SiO2 content,the water absorption of TPS/PVA/SiO2 blends increased,and the water absorption of TPS/PVA(1799)/SiO2 blends was higher than that of TPS/PVA(1788)/SiO2 blends. The water absorption of TPS/PVA/SiO2 blends with SiO2 surface treated was lower than that of the untreated SiO2. With the increase of the SiO2 content,the bio-degradation of TPS/PVA/SiO2 blends decreased,the melting peak of the blends increased,however the melting en-thalpy decreased.
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