摘要
利用双螺杆挤出机对玉米淀粉进行糊化处理,经干燥、粉碎后制得预糊化淀粉,以其为原料,添加甘油,PVA为增塑剂制备热塑性淀粉,经模压制备片材后,通过偏光显微镜分析了淀粉的糊化情况,研究了甘油含量和PVA含量变化对材料性能的影响。实验结果表明:甘油含量的增加会降低片材的抗拉强度,但升高其断裂伸长率;而增加了PVA的含量,材料抗拉强度和断裂伸长率均呈增长趋势。
Gelatinized corn starch was prepared by a co-rotating twin-screw extruder,and through drying and comminuting process. Thermoplastic starch was prepared with the gelatinized corn starch powder as raw material and glycerol and Polyvinyl Alcohol（PVA） as plasticizing agents. Thermoplastic starch sheet was prepared with extruding process. Degree of gelatinization was tested by a polarizing microscope. Mechanical properties of prepared thermal plastic starch sheets were studied in relating to type and amount of the plasticizing agents. The results showed that increasing of glycerol content can decrease the tensile strength and increase the elongation at break; increasing of PVA content can both increase the tensile strength and the elongation at break of the material.
出处
《包装工程》
CAS
CSCD
北大核心
2010年第3期10-13,共4页
Packaging Engineering
基金
国家自然科学基金项目(50675155)
关键词
淀粉
挤出
热塑性
starch
extrusion
thermoplastics
