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Crystalline morphology of PLA/clay nanocomposite films and its correlation with other properties

机译:PLA /粘土纳米复合薄膜的晶体形态及其与其他性能的关系

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摘要

Polylactic acid (PLA)-based composite films with four different loadings of nanoclay (2, 5, 10, and 15 wt %) were prepared using a solvent casting method and their crystalline morphology was investigated. The crystalline morphology was significantly different in the films depending on the clay content and its dispersion in the matrix. The clay platelets played the role of nucleating sites facilitating crystallization during solvent evaporation and this effect was most predominant in PLA 10. The % crystallinity and the crystallite size were determined by XRD analysis. The morphology was investigated with scanning electron microscopy (SEM) and by atomic force microscopy (AFM). A fibrillar pattern was evident in SEM micrographs, which were confirmed by AFM. The thermal properties were investigated with DSC and TGA. The glass transition temperature (T_g) increased from 51.9 to 55-57°C in all the nanocomposite samples. The melting peak temperature (168°C) remained unaltered in the nanocomposites, but the melting enthalpy varied depending on the PLA/clay interaction. The rate of degradation was controlled by the dispersion of clay platelets in the matrix and was very low in low clay-filled films.
机译:使用溶剂浇铸法制备了具有四种不同粘土负载量(2、5、10和15 wt%)的聚乳酸(PLA)基复合膜,并研究了它们的晶体形态。膜中的晶体形态显着不同,具体取决于粘土含量及其在基体中的分散性。粘土血小板在溶剂蒸发过程中起促进结晶的成核位点的作用,这种作用在PLA 10中最为明显。通过XRD分析确定结晶度%和微晶尺寸。用扫描电子显微镜(SEM)和原子力显微镜(AFM)研究了形态。在AFM上证实的SEM照片中有明显的纤维状图案。用DSC和TGA研究热性能。在所有纳米复合材料样品中,玻璃化转变温度(T_g)从51.9升高到55-57℃。纳米复合材料的熔融峰值温度(168°C)保持不变,但是熔融焓随PLA /粘土相互作用而变化。降解速率由粘土薄片在基质中的分散控制,在低粘土填充的薄膜中降解速率非常低。

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