Fabricating composite films by dispersing clay in a polymer can provide functionalities such as antibiotic action and chemical adsorption. In this study, the effects of the shape and surface treatment of clay on the gas barrier properties, mechanical properties, thermal properties, and processing characteristics of polymer/clay composite films were investigated. Halloysites (HNTs) and vermiculites (VMTs), which are popular clays of the nanotube and nanoplate types, respectively, that are often employed to achieve functionality as they facilitate the carrying of chemicals, were incorporated into low-density polyethylene (LDPE). The effects of chemical treatment of the clay surface on the dispersibility of the clays in the polymer composites and on their properties were examined. Furthermore, the effects of the shapes and surface treatment of the clays on the drawabilities of the composite films, as well as the mechanical properties of the composite films according to the draw ratio were investigated. In the manufactured LDPE/clay composite films, the HNTs showed better dispersibility than the VMTs. After surface treatment with hydrochloric acid, the dispersibility improved relative to that before chemical treatment. With increasing clay content, the initial moduli of the composite sheets improved, but the tensile strengths and strains decreased. When VMTs were used, the gas barrier property of the composite film improved as the clay content increased; however, when HNTs were used, the gas barrier property decreased with increasing clay content When the clay surface was chemically treated, the drawabilities of the LDPE composites improved compared to those prior to surface treatment, and the drawabilities of the HNT composites were greater than those of the VMT composite. The maximum draw ratio of the surface-treated HNT composite film was the highest at 4.0, and the tensile strength increased by up to ≈3 times compared to that of the undrawn film. As the draw ratio increased, the gas barrier property, crystallinity, and the degree of orientation also increased.

中文翻译：

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黏土的形状和表面处理对单轴拉伸低密度聚乙烯/黏土复合薄膜工艺的影响

通过将粘土分散在聚合物中来制造复合膜可以提供诸如抗生素作用和化学吸附的功能。在这项研究中，研究了粘土的形状和表面处理对聚合物/粘土复合薄膜的气体阻隔性能，机械性能，热性能和加工特性的影响。低密度聚乙烯（LDPE）中掺入了分别为纳米管和纳米板类型的常用粘土的埃洛石（HNT）和ver石（VMT），它们通常被用来实现功能性，因为它们促进了化学物质的携带。考察了粘土表面化学处理对粘土在聚合物复合材料中的分散性及其性能的影响。此外，研究了粘土的形状和表面处理对复合膜拉伸性能的影响，以及根据拉伸比对复合膜力学性能的影响。在制造的LDPE /粘土复合膜中，HNT的分散性比VMT好。用盐酸进行表面处理后，分散性相对于化学处理前有所提高。随着粘土含量的增加，复合材料片材的初始模量提高，但拉伸强度和应变降低。当使用VMT时，随着粘土含量的增加，复合膜的阻气性提高。然而，当使用HNTs时，阻气性随黏土含量的增加而降低。与表面处理之前相比，LDPE复合材料的可拉伸性得到了改善，HNT复合材料的可拉伸性比VMT复合材料大。经表面处理的HNT复合膜的最大拉伸比最高，为4.0，与未拉伸膜相比，拉伸强度提高了≈3倍。随着拉伸比的增加，气体阻隔性，结晶度和取向度也增加。