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首页> 外文期刊>Journal of Polymers and the Environment >Studies on the Combined Impact of Starch Source and Multiple Processing on Selected Properties of Thermoplastic Starch/Ethylene-Vinyl Acetate Blends
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Studies on the Combined Impact of Starch Source and Multiple Processing on Selected Properties of Thermoplastic Starch/Ethylene-Vinyl Acetate Blends

机译：淀粉来源和多重加工对热塑性淀粉/乙烯-乙酸乙烯酯共混物选择性能的综合影响研究

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摘要

Thermoplastic starch (TPS)/ethylene vinyl acetate (EVA) blends compatibilized with polyethylene-graft-maleic anhydride (PE-g-MA) were prepared from various native starches (potato, maize and waxy maize) and subjected to multiple extrusion cycles. Source of starch has significant impact on its composition, hence properties of obtained TPS and their blends with EVA. Higher content of amylopectin in waxy maize starch, comparing to other types, enhanced the mechanical performance and increased tensile strength and elastic modulus even by 41 and 71%, respectively. Such effect was related to the branching of amylopectin and was confirmed by SEM analysis of fracture areas, which showed more ductile behavior for blends with higher content of amylose. Multiple processing had beneficial impact on the performance of blends, due to the increasing compatibility and more homogenous structure after additional processing time. FTIR analysis indicated higher extent of compatibilization reaction, which, together with finer morphology, resulted in the enhancement of mechanical performance. Such effect is very beneficial from application point of view, because materials can be reprocessed without the loss of properties.
机译：由各种天然淀粉（马铃薯，玉米和糯玉米）制备与聚乙烯接枝-马来酸酐（PE-g-MA）相容的热塑性淀粉（TPS）/乙烯乙酸乙烯酯（EVA）共混物，并进行多次挤出循环。淀粉的来源对其组成有重大影响，因此影响了获得的TPS及其与EVA的共混物的性能。与其他类型相比，蜡质玉米淀粉中支链淀粉的含量更高，机械性能提高，拉伸强度和弹性模量分别提高41％和71％。这种作用与支链淀粉的分支有关，并通过断裂区域的SEM分析得到证实，对于直链淀粉含量更高的混合物，其表现出更大的延展性。多次加工对共混物的性能产生了有益的影响，这是由于增加了加工时间后，其相容性不断提高，结构更加均一。 FTIR分析表明相容性反应程度更高，再加上更精细的形态，导致了机械性能的提高。从应用的角度来看，这种效果非常有益，因为可以对材料进行重新加工而不会损失性能。

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