The objective of this study was to develop polymeric films of high-density polyethylene (HDPE)/low-density polyethylene (LDPE) that comprise 1 wt% of different nanofillers, that is, either nanofibrillated cellulose (NFC), montmorillonite clay (MMT), or graphene nanoplatelets (GNPs); the polymeric films were developed with and without the inclusion of a coupling agent (CA). The results indicated that all the samples that comprised nanofillers exhibited, at least, an increase of 3 to 25°C compared with that of the matrix and demonstrated higher stability at the beginning of the thermal degradation, as verified using TGA. In the DSC analysis of the samples that contained GNPs had highest crystallinity index (55%), having as the consequent improvement in the mechanical properties and in the oxygen permeation. The incorporation of GNPs provided a 127.71% increase in deformation at break and a lower value in oxygen permeability with 50.06 mL.cm.(cm2.s.cmHg)−1, when compared to the polymeric matrix. It was concluded that all the different nanofillers tested promoted distinct improvements in HDPE/LDPE films nanocomposite. It can be inferred that these modifications are related to the chemical composition, size and morphology of each nanofiller. Thereby, it is indicated that with the use of each nanofiller one must be in accordance with the necessary demand of each composite film.

中文翻译：

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不同纳米填料掺入量对 HDPE/LDPE 薄膜纳米复合材料的影响

本研究的目的是开发高密度聚乙烯 (HDPE)/低密度聚乙烯 (LDPE) 聚合物薄膜，其中包含 1 wt% 的不同纳米填料，即纳米原纤化纤维素 (NFC)、蒙脱石粘土 (MMT) ，或石墨烯纳米片（GNP）；聚合物薄膜的开发包含或不包含偶联剂（CA）。结果表明，与基质相比，所有包含纳米填料的样品至少表现出 3 至 25°C 的升高，并且在热降解开始时表现出更高的稳定性，如使用 TGA 验证的。在 DSC 分析中，含有 GNP 的样品具有最高的结晶度指数 (55%)，因此机械性能和氧渗透性得到改善。 GNP 的加入使断裂变形增加了 127.71%，并且氧渗透率降低了 50.06 mL.cm.(cm2.s.cmHg)−1，与聚合物基质相比。结论是，测试的所有不同纳米填料都促进了 HDPE/LDPE 薄膜纳米复合材料的明显改进。可以推断，这些修饰与每种纳米填料的化学成分、尺寸和形貌有关。由此表明，每种纳米填料的使用必须符合每种复合膜的必要要求。