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Poly(lactic acid) formulations with improved toughness by physical blending with thermoplastic starch

机译:聚(乳酸)配方通过与热塑性淀粉物理混合而改善韧性的制剂

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摘要

This work focuses on poly(lactic acid) (PLA) formulations with improved toughness by physical blending with thermoplastic maize starch (TPS) plasticized with aliphatic-aromatic copolyester up to 30 wt %. A noticeable increase in toughness is observed, due to the finely dispersed spherical TPS domains in the PLA matrix. It is worth to note the remarkable increase in the elongation at break that changes from 7% (neat PLA) up to 21.5% for PLA with 30 wt % TPS. The impact-absorbed energy is markedly improved from the relatively low values of neat PLA (1.6 Jm(-2)) up to more than three times. Although TPS is less thermally stable than PLA due to its plasticizer content, in general, PLA/TPS blends offer good balanced thermal stability. The morphology reveals high immiscibility in PLA/TPS blends, with TPS-rich domains with an average size of 1 m, finely dispersed which, in turn, is responsible for the improved toughness. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45751.
机译:这项工作侧重于聚(乳酸)(PLA)配方,通过用脂族 - 芳族共聚酯塑化的热塑性玉米淀粉(TPS)的物理混合,其具有改善的韧性,其具有脂族芳族共聚酯的30wt%。 由于PLA矩阵中的细分球形TPS结构域,观察到韧性的明显增加。 值得注意的是,伸长率的显着增加,从7%(纯PLA)变化高达21.5%,PLA具有30wt%TPS。 从纯PLA的相对低值(1.6JM(-2))高达三倍的相对较低的值显着改善了冲击吸收的能量。 尽管由于其增塑剂含量,TPS比PLA较少,但是,通常,PLA / TPS混合物提供良好的平衡热稳定性。 形态揭示了PLA / TPS混合物中的高不粘合,具有平均尺寸为1μm的TPS的富座,依次精细分散,这反过来负责改进的韧性。 (c)2017 Wiley期刊,Inc.J.Phill。 聚合物。 SCI。 2018,135,45751。

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