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Development and characterization of unmodified kaolinite/EVOH nanocomposites by melt compounding

机译:通过熔融配混开发和表征未改性的高岭石/ EVOH纳米复合材料

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摘要

Nanocomposites of unmodified kaolinite (Kaol)/ethylene-vinyl alcohol copolymer (EVOH) with different Kaol contents have been obtained by a two-step process: melt blending in an internal mixer and film processing by co-extruding the obtained clay polymer nanocomposites pellets in between two low-density polyethylene (LDPE) layers. The addition of the clay mineral to the molten polymer has been carried out by using a Kaol/EVOH masterbatch containing 15 mass% Kaol. The so-obtained samples have been analysed by means of WAXS, SEM, TEM, DMA and tensile tests. Finally, barrier properties to water vapour and oxygen at two relative humidities have been assessed. Morphological analysis has revealed high degree of dispersion and distribution of the Kaol within the EVOH matrix. A considerable increase in the mechanical and in the barrier properties has been found. The present work puts forward the effectiveness of an unmodified kaolinite for obtaining ultra-high barrier clay mineral/polymer nanocomposites.
机译:通过两步法获得了具有不同高岭石含量的未改性高岭石(Kaol)/乙烯-乙烯醇共聚物(EVOH)的纳米复合材料:在内部混合器中熔融共混,以及通过将获得的粘土聚合物纳米复合材料颗粒共挤出到薄膜中进行薄膜加工。在两个低密度聚乙烯(LDPE)层之间。通过使用包含15质量%的Kaol的Kaol / EVOH母料,将粘土矿物添加到熔融聚合物中。如此获得的样品已经通过WAXS,SEM,TEM,DMA和拉伸测试进行了分析。最后,已经评估了在两个相对湿度下对水蒸气和氧气的阻隔性能。形态分析表明,高岭土在EVOH基质中高度分散和分布。已经发现机械性能和阻隔性能大大提高。本工作提出了未改性的高岭石对于获得超高阻隔粘土矿物/聚合物纳米复合材料的有效性。

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