淀粉干法酯化改性对淀粉/聚乳酸复合材料紫外老化性能的影响

doi:10.3969/j.issn.0253-2417.2014.06.004

Abstract

Abstract: Maleic anhydride esterified starch was synthesized by using dry method with corn starch as raw material and maleic anhydride (MAH) as esterifying agent. FT-IR test results confirmed the successful esterification reaction between the maleic anhydride and corn starch. The maleic anhydride esterified starch was then blended with polylactic acid (PLA), and the mixture was melted and extruded to produce the esterified starch/polylactic acid (ES/PLA) composite. The composite was accelerated aging with UV aging box in order to study the effect of this process on aging properties of composites. FT-IR and SEM results showed that prolonging the aging time led to gradually decrease in the absorption peak strength of C—O, C—H and C=O and gradually increase in the extent of damage to the composite. In the same aging time, the group absorption peak strength of ES/PLA was higher than that of native starch/PLA (NS/PLA), and the extent of damage was less. XRD and DSC results showed that the crystallization peak of 2θ=21° disappeared and the crystallization peak of PLA at 16.5° appeared. This indicated that the hydrolysis of starch was faster than that of PLA. With the increase of the aging time, the crystallization of PLA in composites increased first, then decreased. It suggested that amorphous of PLA was first hydrolyzed. Influenced by the crystallinity, thermal decomposition temperature of composites increased first, and then decreased. The thermal stability of ES/PLA was better than that of NS/PLA. Besides, when the aging time was same, ES/PLA performed better mechanical properties compared with NS/PLA. And with the aging time prolonged, the mechanical strength of NS/PLA and ES/PLA gradually decreased.

Key words: dry method esterified starch, polylactic acid, UV aging, performance characterization

CLC Number:

TQ35
TQ028.8

ZUO Ying-feng, GU Ji-you, YANG Long, TAN Hai-yan, ZHANG Yan-hua. Effect of Starch Esterification Performed by Dry Method on UV Aging Properties of Starch/Polylactic Acid Composite[J]. Chemistry and Industry of Forest Products, 2014, 34(6): 21-28.

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Effect of Starch Esterification Performed by Dry Method on UV Aging Properties of Starch/Polylactic Acid Composite

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