淀粉/PVA生物降解材料的热塑性研究

摘要

将聚乙烯醇(PVA)、淀粉、增塑剂在Hakke流变仪中共混制备了热塑性淀粉/PvA材料,研究了2种PVA-PVA1799、PVA1788,2种淀粉-玉米淀粉、木薯淀粉的热塑性情况;比较了甘油、乙二醇、乙酰胺3种增塑剂的增塑效果.结果表明:采用合适的增塑剂与适当的PVA、淀粉组合可以使PVA/淀粉共混体系在高温下热塑成型;乙酰胺能跟PVA和淀粉形成很强的氢键,具有明显的增塑作用,使淀粉/PVA充分塑化,并保持较好的力学性能.%PVA, starch and plasticizers were blended in Hake Rheometer to prepare the thermoplastic starch/ PVA blends. Two kinds of PVA (PVA1799 and PVA1788) and two kinds of starch( com starch and cassava starch) were used to plastify the blends. The plasticizing effects of 3 kinds of plasticizers( glycol, glycerol and acetamide) were studied. Results showed that PVA and starch could be thermoplasticly processed with appropriate plasticizer,PVA and starch. Acetamide could form strong hydrogenolysis with PVA and starch, resulting in better plastification on the blends. The PVA/starch blends were well plastified by acetamide and maintained favorable mechanical properties.