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首页> 外文期刊>Polymer Degradation and Stability >Effect of natural weather on the structure and properties of polylactide/Cloisite 30B nanocomposites
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Effect of natural weather on the structure and properties of polylactide/Cloisite 30B nanocomposites

机译：自然天气对聚丙交酯/次氯酸盐30B纳米复合材料结构和性能的影响

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摘要

The degradation of polylactide (PLA)/Cloisite 30B nanocomposites under natural weathering was investigated as a function of clay loadings (1, 3 and 5 wt.%) for up to 130 days using Fourier transform infrared (FT-IR) spectroscopy, size exclusion chromatography (SEC), nanoindentation measurements, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). For comparative purposes, the neat PLA was also considered. The FT-IR results showed that the photo-oxidation mechanism of PLA was not modified in the presence of Cloisite 30B, but only the degradation rates were accelerated. Moreover, the photo-oxidative degradation of PLA nano-composite samples led to the formation of vinyl unsaturation, carbonyls, anhydrides and hydroperoxides groups as a result of the occurrence of several chemical mechanisms simultaneously. The decrease of the weight-average molecular weight, and the number-average molecular weight associated with an enhanced polydispersity of the nanocomposite samples indicated that chain scission was the most prominent phenomenon in natural weathering. The thermal degradation of the PLA was faster in the presence of clay. Modulus and hardness measured by nanoindentation increased slightly with exposure time for both neat PLA and PLA nanocomposite samples; the increase is also a function of the clay content. Finally, the weathering effect on the morphology of exposed samples observed by SEM revealed that the fractured surfaces exhibited many voids and cracks. These defects were much more pronounced for the PLA nanocomposites.
机译：使用傅立叶变换红外（FT-IR）光谱研究了长达130天的自然风化作用下聚丙交酯（PLA）/ Cloisite 30B纳米复合材料的降解与粘土含量（1、3和5 wt。％）的关系，尺寸排阻色谱（SEC），纳米压痕测量，差示扫描量热法（DSC），热重分析（TGA）和扫描电子显微镜（SEM）。为了进行比较，还考虑了纯净的PLA。 FT-IR结果表明，在Cloisite 30B的存在下，PLA的光氧化机理没有改变，但降解速度加快了。此外，由于同时发生多种化学机理，PLA纳米复合材料样品的光氧化降解导致乙烯基不饱和基团，羰基，酸酐和氢过氧化物基团的形成。重均分子量的降低以及数均分子量的增加与纳米复合材料样品的多分散性相关，表明断链是自然风化中最突出的现象。在粘土存在下，PLA的热降解速度更快。对于纯PLA和PLA纳米复合材料样品，通过纳米压痕测量的模量和硬度随暴露时间的增加而略有增加。增加也是粘土含量的函数。最后，通过SEM观察到的风化作用对暴露的样品的形态的影响表明，断裂表面表现出许多空隙和裂纹。对于PLA纳米复合材料，这些缺陷更为明显。

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  • 来源
    《Polymer Degradation and Stability》 |2010年第9期|p.1751-1758|共8页
  • 作者

    Lynda Zaidi; rnMustapha Kaci; rnStephane Bruzaud; rnAlain Bourmaud; rnYves Grohens;

  • 作者单位

    Laboratoire des Materiaux Organiques, Faculte de la Technologic Universite Abderrahmane Mira, Bejaia 06000, Algeria;

    rnLaboratoire des Materiaux Organiques, Faculte de la Technologic Universite Abderrahmane Mira, Bejaia 06000, Algeria;

    rnLaboratoire d'Ingenierie des Materiaux de Bretagne, Equipe E2PIC, Universite de Bretagne Sud, Rue de Saint Maude, 56321 Lorient Cedex, France;

    rnLaboratoire d'Ingenierie des Materiaux de Bretagne, Equipe E2PIC, Universite de Bretagne Sud, Rue de Saint Maude, 56321 Lorient Cedex, France;

    rnLaboratoire d'Ingenierie des Materiaux de Bretagne, Equipe E2PIC, Universite de Bretagne Sud, Rue de Saint Maude, 56321 Lorient Cedex, France;

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  • 正文语种 eng
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  • 关键词

    polylactide; clay; nanocomposites; natural weather; ageing; photo-oxidation;

    机译：聚丙交酯粘土;纳米复合材料自然天气老化;光氧化;

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