首页> 美国卫生研究院文献>ACS Omega >Effect of Dicumyl Peroxide on a Poly(lactic acid)(PLA)/Poly(butylene succinate) (PBS)/Functionalized Chitosan-BasedNanobiocomposite for Packaging: A Reactive Extrusion Study
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Effect of Dicumyl Peroxide on a Poly(lactic acid)(PLA)/Poly(butylene succinate) (PBS)/Functionalized Chitosan-BasedNanobiocomposite for Packaging: A Reactive Extrusion Study

机译:过氧化二枯基对聚乳酸的影响(PLA)/聚丁二酸丁二酯(PBS)/基于壳聚糖的功能化用于包装的纳米生物复合材料:反应挤出研究

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摘要

Nanobiocomposites with balanced mechanical characteristics are fabricated from poly(lactic acid) (PLA)/poly(butylene succinate) (PBS)blend at a weight ratio of 80/20 in association with varying concentrations of functionalized chitosan (FCH) through reactive extrusion at a temperature of 185 °C. The combined effect of FCH and dicumyl peroxide (DCP) showed insignificant change in tensile strength with a remarkable increase in % elongation at break (∼45%) values. Addition of DCP also caused increase in the molecular weight (Mw ∼ 22%) of the PLA/PBS/1DFCH nanobiocomposite, which is attributed to the cross-linking/branching effect of FCH on the polymers. The interfacial polymer–filler adhesion is also improved, which is observed from the field-emission scanning electron microscopy images of PLA/PBS/1DFCH. For PLA/PBS/1DFCH, the crystallization rate and nucleation density of PLA are increased because of cross-linked/branched structures are developed, which acted as nucleating sites. Therefore, the present work facilitates a simple extrusion processing with a combination of balanced thermaland mechanical properties, improved hydrophobicity (∼27%),and UV-C-blocking efficiency, which draw the possibility for the utilizationof the ecofriendly nanobiocomposite in the packing of UV-sensitivematerials on a commercial level.
机译:具有平衡的机械特性的纳米生物复合材料是由聚乳酸(PLA)/聚丁二酸丁二酯(PBS)混合物以80/20的重量比与不同浓度的官能化脱乙酰壳多糖(FCH)通过反应性挤出在80℃下制备而成的温度为185°C。 FCH和过氧化二枯基(DCP)的共同作用表明,抗张强度变化不明显,断裂伸长率%(〜45%)值显着增加。 DCP的添加还引起PLA / PBS / 1DFCH纳米生物复合物的分子量增加(Mw〜22%),这归因于FCH对聚合物的交联/支化作用。从PLA / PBS / 1DFCH的场发射扫描电子显微镜图像可以观察到界面聚合物与填料的粘合性也得到了改善。对于PLA / PBS / 1DFCH,PLA的结晶速率和成核密度增加了,因为开发了交联/分支结构,该结构充当了成核位点。因此,本发明有利于简单的挤出加工,并结合了平衡的热和机械性能,改善的疏水性(〜27%),和UV-C阻断效率,这为利用提供了可能性环保型纳米生物复合材料在紫外线敏感包装中的应用商业级别的材料。

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