Preparation, Enhancement And Properties Of Thermoplastic Starch

Compared with other biodegradable polymers, starch has many advantages eg:wide variety of sources,low price,easy to biological degradation etc, so it has an important position in the field of bio-degradable plastic. However, due to its multi-hydroxy starch structure and crystallization of ordered structure, and the resulting number of features, limiting the use of starch-based materials. While natural polymers as thermoplastic starch additive have large quantities, they are renewable and the regeneration cycle of natural polymers are shorter, but humans use of them are limited .So the research in this area can not only alleviate the problem of resources but also solve environmental pollution problems, thus we can realize the sustainable development of mankind.Common corn is raw material In this article, glycerol,formamide,,urea are plasticizers, carboxymethyl cellulose is reinforcement.High-speed mixing and single-screw extrusion are used to prepared thermoplastic starch, and the characterization and performance testing of thermoplastic starch are studied. Contents and the main study results are as follows:1. High-speed mixing prepared thermoplastic starch. IR and XRD results indicate that stability and resistance to retrogradation properties of formamide and urea plasticized thermoplastic starch are better than glycerol plasticized thermoplastic starch;TG curve results show the thermal stability order of three kinds of plasticizers plasticized thermoplastic starch is glycerol UPTPS (39.8)> FPTPS (37.5)> APTPS (35.3);mechanical test results that the descending order of tensile strength is UPTPS (10.00), GPTPS (2.84), FPTPS (1.67) and APTPS (1.56), the descending order of elongation is FPTPS (69%), GPTPS (51%), APTPS (36%) and UPTPS (34%).3. Fiber reinforced thermoplastic Starch. SEM shows the mixture of amide and urea could plasticed amorphous and continuous objective TPS; X-ray diffraction of urea and formamide indicates that when the ratio of the two plasticers is 2:1,they can effectively restrain the retrogradation of starch; TG analysis shows that an appropriate proportion of urea (20%) and formamide (10%) can significantly improve the thermal stability of TPS; The TPS of formamide and urea mixing plasticed has excellent tensile strength and elongation at break, and its rheological properties should be better than the GPTPS.4. Characterization and performance testing of thermoplastic. Carboxymethyl cellulose could make mixed system more uniform continuous phase; fibers improve thermal stability of system from different levels; While maintaining good resistance to retrogradation properties of UFPTS, fiber reinforce mechanical strength.