Cao Weihua, Zhu Hong
School of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China.
Materials (Basel). 2024 Jul 14;17(14):3492. doi: 10.3390/ma17143492.
In this study, the impact of the addition of high-aspect-ratio nano-ettringite to photocurable epoxy acrylate resin was explored. The nano-ettringite samples were modified using γ-Aminopropyltriethoxysilane (KH-550) and γ-methacryloxypropyl trimethoxy silane (KH-570). Then, 3 wt% or 6 wt% KH-550-modified, KH-570-modified, and unmodified nano-ettringite samples were dispersed into resin via ultrasonic treatment in conjunction with mechanical stirring. The grafting effects of nano-ettringite onto KH-550 or KH-570 were analyzed through scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and thermogravimetric (TG) analysis. The results demonstrate that KH-550 and KH-570 have been successfully grafted onto the surface of nano-ettringite. In addition, this study also focuses on the variations of composite materials in the viscosity, shrinkage, tensile strength, and elongation at break. The results indicate that increased dosages of unmodified, KH-550-modified, and KH-570-modified nano-ettringite led to increased viscosity of the composite while reducing shrinkage. At the same dosage, the photocurable resin containing KH-570-modified nano-ettringite demonstrated a lower shrinkage and a higher tensile strength. From the analysis of tensile fracture surfaces, it was observed that compared to the KH-550 modified and unmodified variants, the KH-570 modified nano-ettringite exhibits superior dispersibility in photocurable epoxy acrylate resin. Notably, when the amount of KH-570-modified nano-ettringite was 3 wt%, the highest tensile strength of the composite was 64.61 MPa, representing a 72.57% increase compared to the blank sample. Furthermore, the incorporation of KH-570-modified nano-ettringite as a filler provides a new perspective for improving the performance of photocurable epoxy acrylate resin composites.
在本研究中，探讨了添加高长径比纳米钙矾石对光固化环氧丙烯酸酯树脂的影响。使用γ-氨丙基三乙氧基硅烷（KH-550）和γ-甲基丙烯酰氧基丙基三甲氧基硅烷（KH-570）对纳米钙矾石样品进行改性。然后，通过超声处理结合机械搅拌，将3 wt%或6 wt%的KH-550改性、KH-570改性和未改性的纳米钙矾石样品分散到树脂中。通过扫描电子显微镜（SEM）、傅里叶变换红外（FTIR）光谱、X射线衍射（XRD）和热重（TG）分析，分析了纳米钙矾石在KH-550或KH-570上的接枝效果。结果表明，KH-550和KH-570已成功接枝到纳米钙矾石表面。此外，本研究还关注了复合材料在粘度、收缩率、拉伸强度和断裂伸长率方面的变化。结果表明，未改性、KH-550改性和KH-570改性的纳米钙矾石用量增加导致复合材料粘度增加，同时收缩率降低。在相同用量下，含有KH-570改性纳米钙矾石的光固化树脂表现出较低的收缩率和较高的拉伸强度。从拉伸断口分析可知，与KH-550改性和未改性变体相比，KH-570改性纳米钙矾石在光固化环氧丙烯酸酯树脂中表现出更好的分散性。值得注意的是，当KH-570改性纳米钙矾石用量为3 wt%时，复合材料的最高拉伸强度为64.61 MPa，比空白样品提高了72.57%。此外，将KH-570改性纳米钙矾石作为填料加入为提高光固化环氧丙烯酸酯树脂复合材料的性能提供了新的视角。
