Tastanova Lyazzat, Bekeshev Amirbek, Nurlybay Sultan, Shcherbakov Andrey, Mostovoy Anton
Oil and Gas Department, K. Zhubanov Aktobe Regional University, A. Moldagulova Ave. 34, Aktobe 030000, Kazakhstan.
Polymer Composites Laboratory, K. Zhubanov Aktobe Regional University, A. Moldagulova Ave. 34, Aktobe 030000, Kazakhstan.
Nanomaterials (Basel). 2025 Jul 24;15(15):1145. doi: 10.3390/nano15151145.
This study investigates the effect of the surface functionalization of tungsten disulfide (WS) nanoparticles with aminoacetic acid (glycine) on the structure, curing behavior, and mechanical performance of epoxy nanocomposites. Aminoacetic acid, as a non-toxic, bio-based modifier, enables a sustainable approach to producing more efficient nanofillers. Functionalization, as confirmed by FTIR, EDS, and XRD analyses, led to elevated surface polarity and greater chemical affinity between WS and the epoxy matrix, thereby promoting uniform nanoparticle dispersion. The strengthened interfacial bonding resulted in a notable decrease in the curing onset temperature-from 51 °C (for pristine WS) to 43 °C-accompanied by an increase in polymerization enthalpy from 566 J/g to 639 J/g, which reflects more extensive crosslinking. The SEM examination of fracture surfaces revealed tortuous crack paths and localized plastic deformation zones, indicating superior fracture resistance. Mechanical testing showed marked improvements in flexural and tensile strength, modulus, and impact toughness at the optimal WS loading of 0.5 phr and a 7.5 wt% aminoacetic acid concentration. The surface-modified WS nanoparticles, which perform dual functions, not only reinforce interfacial adhesion and structural uniformity but also accelerate the curing process through chemical interaction with epoxy groups. These findings support the development of high-performance, environmentally sustainable epoxy nanocomposites utilizing amino acid-modified 2D nanofillers.
本研究考察了用氨基乙酸（甘氨酸）对二硫化钨（WS）纳米颗粒进行表面功能化处理，对环氧纳米复合材料的结构、固化行为和力学性能的影响。氨基乙酸作为一种无毒的生物基改性剂，为生产更高效的纳米填料提供了一种可持续的方法。傅里叶变换红外光谱（FTIR）、能谱分析（EDS）和X射线衍射（XRD）分析证实，功能化处理提高了表面极性，增强了WS与环氧基体之间的化学亲和力，从而促进了纳米颗粒的均匀分散。界面结合力的增强导致固化起始温度显著降低——从51℃（原始WS）降至43℃——同时聚合焓从566 J/g增加到639 J/g，这反映了更广泛的交联。对断裂表面的扫描电子显微镜（SEM）检查显示出曲折的裂纹路径和局部塑性变形区，表明具有优异的抗断裂性能。力学测试表明，在WS最佳负载量为0.5 phr且氨基乙酸浓度为7.5 wt%时，弯曲强度、拉伸强度、模量和冲击韧性均有显著提高。具有双重功能的表面改性WS纳米颗粒不仅增强了界面粘附力和结构均匀性，还通过与环氧基团的化学相互作用加速了固化过程。这些发现为利用氨基酸改性的二维纳米填料开发高性能、环境可持续的环氧纳米复合材料提供了支持。
