热塑性淀粉/纤维共混物性能的研究

用甘油作为塑化剂，将糊化淀粉和溶胀纤维按不同配比进行熔融共混来制备完全可生物降解塑料。实验探讨了纤维质量分数对共混体系力学性能、耐水性及热性能的影响。扫描电镜显示了纤维较好地分散在热塑性淀粉(TPS)中，纤维和淀粉结合良好。纤维质量分数对共混体系力学性能影响的研究显示，纤维的加入可以明显地改善体系的力学性能。随着纤维质量分数由0提高到20％，共混体系的拉伸强度达到15．5MPa，杨氏模量达到81．4MPa；伸长率从104％降到7％。同时加入纤维后共混体系的耐水性明显提高。

Study of Property of Thermoplastic Starch/Cellulose Fiber

Full-biodegradable plastics were prepared by means of melt blending of paste starch with swelled fiber at different blending ratio, with glycerol as plasticizer. The effects of the mass fraction of the fiber on the mechanical properties, water resistance and thermal performance of the blend system were experimentally studied. SEM showed the dispersion of microfiber in thermoplastic starch(TPS)and the adhesion between the starch and microfiber were good. The dependence of the mechanical properties of the reinforced TPS on the contents of the microfiber was studied, which showed the addition of the microfiber improved the mechanical properties of the composite obviously. When the mass fraction of the fiber increased from 0 to 20 %, the tensile strength of the composites was doubled to 15.5 MPa and Youngs modulus came up to 81.4 MPa, while the elongation reduced from 104 % to 7 %, and the water resistance of the composite was improved greatly.