Influence of the process on water permeability of semi-crystalline PLA nanocomposites: solvent casting versus annealing of melt-blended films

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing Pub Date : 2025-05-15 DOI:10.1016/j.polymertesting.2025.108862

Aurore Jullin , Gabriel André , Fabrice Gouanvé , Guillaume Sudre , Matthieu Zinet , Nicolas Hascoët , Francisco Chinesta , Eliane Espuche

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Abstract

Semi-crystalline PLA nanocomposites containing fillers of different types have been prepared by melt blending followed by annealing treatment or by solvent casting. Annealed melt blended samples exhibit higher crystallinity (around 47 %) than solvent cast films (around 36 %) independently of the filler type. The glass transition temperature remains similar (around 56 °C) for all investigated films. The filler dispersion, investigated by Transmission Electron Microscopy, has been found to be better with the melt-mixing/annealing process than with the solvent casting process. The water vapor permeability of nanocomposites prepared by solvent casting shows a decrease of the permeability with the addition of fillers whereas it is not the case for annealed nanocomposites for which the permeability is often higher than the one of the annealed unfilled PLA. The permeability cannot be only related to the filler dispersion state but results also from the filler/matrix interfacial properties that depend on the filler type with respect to the matrix, but also on the process used to obtain semi-crystalline nanocomposites. It has been shown that, for silica, halloysite nanotubes and graphene, the melt blending/annealing process has a detrimental impact on the filler/matrix interfacial properties and the water barrier properties which is not the case for montmorillonite for which a 60 % decrease in permeability is reached when using 10 vol% of fillers.

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工艺对半晶聚乳酸纳米复合材料透水性的影响：溶剂铸造与熔融混合薄膜的退火

采用熔融共混后退火处理或溶剂铸造法制备了不同类型填料的半结晶聚乳酸纳米复合材料。与填料类型无关，退火熔融混合样品的结晶度（约47%）高于溶剂铸造薄膜（约36%）。所有研究薄膜的玻璃化转变温度保持相似（约56°C）。通过透射电镜观察，发现熔体混合/退火工艺比溶剂铸造工艺具有更好的填料分散性能。溶剂铸造法制备的纳米复合材料的水蒸气渗透性随填料的加入而降低，而退火后的纳米复合材料的水蒸气渗透性通常高于退火后未填充的PLA。磁导率不仅与填料的分散状态有关，而且还与填料/基体的界面性质有关，这种界面性质取决于填料相对于基体的类型，也取决于用于获得半晶纳米复合材料的工艺。研究表明，对于二氧化硅、高岭土纳米管和石墨烯，熔融共混/退火工艺对填料/基体界面性能和水阻隔性能有不利影响，而蒙脱土则不是这样，当使用10体积%的填料时，蒙脱土的渗透率降低了60%。

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来源期刊

Polymer Testing 工程技术-材料科学：表征与测试

CiteScore

10.70

自引率

5.90%

发文量

328

审稿时长

44 days

期刊介绍： Polymer Testing focuses on the testing, analysis and characterization of polymer materials, including both synthetic and natural or biobased polymers. Novel testing methods and the testing of novel polymeric materials in bulk, solution and dispersion is covered. In addition, we welcome the submission of the testing of polymeric materials for a wide range of applications and industrial products as well as nanoscale characterization. The scope includes but is not limited to the following main topics: Novel testing methods and Chemical analysis • mechanical, thermal, electrical, chemical, imaging, spectroscopy, scattering and rheology Physical properties and behaviour of novel polymer systems • nanoscale properties, morphology, transport properties Degradation and recycling of polymeric materials when combined with novel testing or characterization methods • degradation, biodegradation, ageing and fire retardancy Modelling and Simulation work will be only considered when it is linked to new or previously published experimental results.