Jelić Aleksandra, Sekulić Milica, Travica Milan, Gržetić Jelena, Ugrinović Vukašin, Marinković Aleksandar D, Božić Aleksandra, Stamenović Marina, Putić Slaviša
The Academy of Applied Technical Studies Belgrade, 11030 Belgrade, Serbia.
Center of Excellence for Photoconversion, Vinca Institute of Nuclear Sciences, University of Belgrade, 11030 Belgrade, Serbia.
Polymers (Basel). 2022 Mar 21;14(6):1255. doi: 10.3390/polym14061255.
In this study, silicate nanofillers; dicalcium silicate, magnesium silicate, tricalcium silicate, and wollastonite; were synthesized using four different methods and incorporated into the epoxy resin to improve its mechanical properties. Characterization of the newly synthesized nanofillers was performed using Fourier-transformation infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The purpose of this study was to analyze newly developed composite materials reinforced with silicate nanoparticles utilizing tensile testing and a full-field non-contact 3D Digital Image Correlation (DIC) method. Analysis of deformation and displacement fields gives precise material behavior during testing. Testing results allowed a more reliable assessment of the structural integrity of epoxy composite materials reinforced using different silicate nanofillers. It was concluded that the addition of 3% of dicalcium silicate, magnesium silicate, tricalcium silicate, and wollastonite lead to the increasement of tensile strength up to 31.5%, 29.0%, 27.5%, and 23.5% in comparison with neat epoxy, respectively. In order to offer more trustworthy information about the viscoelastic behavior of neat epoxy and composites, a dynamic mechanical analysis (DMA) was also performed and rheological measurements of uncured epoxy matrix and epoxy suspensions were obtained.
在本研究中，使用四种不同方法合成了硅酸盐纳米填料；硅酸二钙、硅酸镁、硅酸三钙和硅灰石；并将其掺入环氧树脂中以改善其机械性能。使用傅里叶变换红外（FTIR）光谱、X射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对新合成的纳米填料进行了表征。本研究的目的是利用拉伸试验和全场非接触式三维数字图像相关（DIC）方法分析用硅酸盐纳米颗粒增强的新开发复合材料。对变形和位移场的分析给出了测试过程中精确的材料行为。测试结果使人们能够更可靠地评估使用不同硅酸盐纳米填料增强的环氧复合材料的结构完整性。得出的结论是，与纯环氧树脂相比，添加3%的硅酸二钙、硅酸镁、硅酸三钙和硅灰石分别使拉伸强度提高了31.5%、29.0%、27.5%和23.5%。为了提供有关纯环氧树脂和复合材料粘弹性行为的更可靠信息，还进行了动态力学分析（DMA），并获得了未固化环氧基体和环氧悬浮液的流变学测量结果。
