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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：淀粉源和多加工对热塑性淀粉/乙烯 - 乙酸乙烯酯共混物选定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：用聚乙烯 - 移植物 - 马来酸酐（PE-G-MA）相容的热塑性淀粉（TPS）/乙烯乙烯基乙酸乙烯酯（EVA）共混物由各种天然淀粉（马铃薯，玉米和蜡质玉米）制备并进行多种挤出循环。淀粉来源对其组成具有显着影响，因此获得的TPS及其与EVA共混物的性质。蜡质玉米淀粉中较高含量的淀粉素，与其他类型相比，增强了机械性能和增加的抗拉强度和弹性模量，即甚至可以分别为41和71％。这种效果与支链淀粉的支化有关，并通过SEM分析裂缝区域进行了证实，其显示出具有较高含量的直链淀粉的共混物的延展性行为。由于在额外的处理时间后，由于增加的相容性和更均匀的结构，多种处理对混合物的性能有益影响。 FTIR分析表明相容反应的程度更高，与更细的形态一起导致机械性能的提高。这些效果与应用的角度非常有益，因为材料可以在没有物质损失的情况下进行重新处理。

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