Crystallization Behavior of Carbon Nanotube-Polylactide Nanocomposites
Crystallization Behavior of Carbon Nanotube-Polylactide Nanocomposites
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DOI：
10.1021/ma200842n
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发表时间：
2011-08-23
期刊：
影响因子：
5.5
通讯作者：
Seguela, R.
中科院分区：
文献类型：
--
作者：
Barrau, S.;Vanmansart, C.;Seguela, R.
研究了碳纳米管（CNTs）存在下聚乳酸（PLA）的结晶动力学及其结构和形貌。通过扫描电镜观察，溶液和熔体混合制备的纳米复合材料样品呈现均匀的填料分散。根据Avrami的理论分析了非等温和等温结晶行为的量热表征，证明了CNTs对PLA基体结晶动力学的显著影响。拉曼光谱实验证实了纳米填料的成核作用。事实上，在等温结晶过程中，纳米管的特征振动受到聚合物结晶相发育的强烈影响。此外，通过光学显微镜观察到，CNTs增加了成核位点的数量，从而减小了球石的平均尺寸。通过x射线衍射检测，聚乳酸的晶体结构并未因CNTs的存在而发生改变。
The crystallization kinetics and the resulting structure and morphology of polylactide (PLA) were investigated in the presence of carbon nanotubes (CNTs). Nanocomposite samples prepared by solution and melt mixing present homogeneous filler dispersion, as observed by scanning electron microscopy. Calorimetric characterization of the nonisothermal and isothermal crystallization behavior analyzed according to Avrami's theory provides evidence of the significant impact of CNTs on the crystallization kinetics of the PLA matrix. The nucleating effect of the nanofillers is confirmed by Raman spectroscopy experiments. Indeed, during isothermal crystallization, the nanotube characteristic vibrations are strongly affected by the development of polymer crystalline phase. Additionally, CNTs increase the number of nucleation sites and thereby decrease the average spherolite size as observed by optical microscopy. The PLA crystal structure is not modified by the presence of CNTs, as probed by X-ray diffraction.