Kim Suhyun, Kim Moon Il, Shon Minyoung, Seo Bongkuk, Lim Choongsun
Center for Chemical Industry Development, Korea Research Institute of Chemical Technology, Ulsan, 44412, Korea.
Department of Industrial Chemistry, Pukyong National University, Busan, 48547, Korea.
J Nanosci Nanotechnol. 2018 Sep 1;18(9):6152-6156. doi: 10.1166/jnn.2018.15610.
Epoxy resins are widely used in various industrial fields due to their low cost, good workability, heat resistance, and good mechanical strength. However, they suffer from brittleness, an issue that must be addressed for further applications. To solve this problem, additional fillers are needed to improve the mechanical and thermal properties of the resins; zirconia is one such filler. However, it has been reported that aggregation may occur in the epoxy composites as the amount of zirconia increases, preventing enhancement of the mechanical strength of the epoxy composites. Herein, to reduce the aggregation, zirconia was well dispersed on halloysite nanotubes (HNTs), which have high thermal and mechanical strength, by a conventional wet impregnation method. The HNTs were impregnated with zirconia at different loadings using zirconyl chloride octahydrate as a precursor. The mechanical and thermal strengths of the epoxy composites with these fillers were investigated. The zirconia-impregnated HNTs (Zr/HNT) were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and tunneling electron microscopy (TEM). The hardening conditions of the epoxy composites were analyzed by differential scanning calorimetry (DSC). The thermal strength of the epoxy composites was studied by thermomechanical analysis (TMA) and micro-calorimetry and the mechanical strength of the epoxy composites (flexural strength and tensile strength) was studied by using a universal testing machine (UTM). The mechanical and thermal strengths of the epoxy composites with Zr/HNT were improved compared to those of the epoxy composite with HNT, and also increased as the zirconia loading on HNT increased.
环氧树脂因其成本低、加工性能好、耐热性和机械强度高而广泛应用于各种工业领域。然而，它们存在脆性问题，这是进一步应用中必须解决的问题。为了解决这个问题，需要添加额外的填料来改善树脂的机械和热性能；氧化锆就是这样一种填料。然而，据报道，随着氧化锆用量的增加，环氧复合材料中可能会发生团聚，从而阻碍环氧复合材料机械强度的提高。在此，为了减少团聚，通过传统的湿浸渍法将氧化锆很好地分散在具有高机械和热强度的埃洛石纳米管（HNTs）上。使用八水合氧氯化锆作为前驱体，以不同负载量将氧化锆浸渍到HNTs上。研究了含有这些填料的环氧复合材料的机械和热强度。通过X射线光电子能谱（XPS）、X射线衍射（XRD）和隧道电子显微镜（TEM）对浸渍了氧化锆的HNTs（Zr/HNT）进行了表征。通过差示扫描量热法（DSC）分析了环氧复合材料的固化条件。通过热机械分析（TMA）和微量量热法研究了环氧复合材料的热强度，并使用万能试验机（UTM）研究了环氧复合材料的机械强度（弯曲强度和拉伸强度）。与含有HNT的环氧复合材料相比，含有Zr/HNT的环氧复合材料的机械和热强度得到了提高，并且随着HNT上氧化锆负载量的增加而增加。
