| Summary: | 碩士 === 大同大學 === 生物工程學系(所) === 94 === In this study, we used signal-screw extruder to extruding starch and aliphatic-aromatic copolyester. In order to define the optimal property, we direct at the mechanical strength of biodegradable plastic；This research had five parts mainly: (1) adding amount of Plasticizer (water and glycerol ); (2) various kinds of garniture; (3) the proportion of lecithin and enzyme; (4) different kinds of starch; (5) the proportion of water to glycerol. We focused on the mechanical nature of our products and hoped to find out the optimal prescription. The results of this study demonstrated: (1) While (water and glycerol) / TPS was 25%, it was the best adding amount of plasticizer. (2) Although polylactic acid（PLA）could increase the tensile strength and modulus, but elongation and toughness would decline obviously. And other garnitures, such as ethyl cellulose, glucose, palmitic acid, stearic acid and CaO, etc., had not improved the mechanical nature apparently. (3) In the process, enzyme must to be added, otherwise its mechanical nature would decline rapidly. However, the amount of enzyme did not influence the result. Adding the content of lecithin could improve the elongation and toughness in its mechanical nature, but it also reduced the tensile strength and modulus. (4) After the process, adding the corn starch would get the best mechanical nature. Therefore, the corn starch was the most preferable starch. (5) While the proportion of water to glycerol was 0.17％ to 0.52％, the product had largest tensile strength and modulus. In summary, while the proportion of water to glycerol was 0.17％ to 0.52％ and (water and glycerol) /TPS was 25%, the corn starch and aliphatic-aromatic copolyester were processed. Its mechanical nature was tensile strength of 12.3±0.2MPa, elongation of 281.3±59.9%, modulus of 180.8±7.9 MPa, and toughness 26.6±6 MPa. And that was the optimal prescription of this research
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