Zhang Yajun, Li Xiangmeng, Zhang Jinjing, Yan Chao, Li Jiaojiao, Zhu Xijing
Shanxi Provincial Key Laboratory for Advanced Manufacturing Technology, North University of China Taiyuan 030051 China
State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University Xi'an 710054 China.
RSC Adv. 2025 Sep 11;15(39):32919-32928. doi: 10.1039/d5ra04063a. eCollection 2025 Sep 5.
An ordered and rationally designed distribution structure can fully exploit the superior properties of micro/nano-fillers, maximizing the synergistic effects between the fillers and the matrix. However, current research primarily focuses on the linear alignment of fillers, which only enhances the composite's performance along a specific direction. In this study, sulfonated polystyrene (SPS) particles were arranged in an annular pattern induced by an electric field. Similar to the role of aggregates in concrete, the oriented SPS particles acted as rigid support points, constructing "micro-bridges" within the matrix. These SPS particles cooperatively bore the load with the matrix, reducing stress concentration and enabling the composite to exhibit improved integrity and stability. In tensile tests, hydrogels containing 1 wt% oriented particles demonstrated an approximately 68.5% increase in fracture elongation and a 7.67 kPa enhancement in tensile strength compared to the pure polyacrylamide hydrogel. This study introduces a novel filler annular orientation strategy that enables isotropic enhancement of composite properties while effectively overcoming the limitations imposed by conventional direction-dependent reinforcement mechanisms.
有序且合理设计的分布结构能够充分发挥微/纳米填料的优异性能，使填料与基体之间的协同效应最大化。然而，目前的研究主要集中在填料的线性排列上，这仅能沿特定方向提高复合材料的性能。在本研究中，磺化聚苯乙烯（SPS）颗粒在电场作用下呈环形排列。类似于骨料在混凝土中的作用，取向的SPS颗粒充当刚性支撑点，在基体内构建“微桥”。这些SPS颗粒与基体协同承载载荷，降低应力集中，使复合材料表现出更好的完整性和稳定性。在拉伸试验中，与纯聚丙烯酰胺水凝胶相比，含有1 wt%取向颗粒的水凝胶的断裂伸长率提高了约68.5%，拉伸强度提高了7.67 kPa。本研究引入了一种新颖的填料环形取向策略，能够在有效克服传统方向依赖性增强机制所带来的局限性的同时，实现复合材料性能的各向同性增强。
