The synergistic effect of nano-Al2O3 size and concentration on the interfacial adhesion properties of SMA/PDMS composites and their enhancement mechanism

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Composite Structures Pub Date : 2024-11-10 DOI:10.1016/j.compstruct.2024.118696

Junjie Xiao, Biao Liang, Bo Liu, Mengfei Feng, Hui Cheng, Kaifu Zhang

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Abstract

Soft actuators composed of shape memory alloy (SMA) wires embedded in polydimethylsiloxane (PDMS) matrix hold potential for shape-morphing structures and soft robots. However, SMA exhibits poor bonding with PDMS due to its smooth and nonpolar surfaces. Nanoparticles show promise in interfacial strengthening of polymer composites. In this work, KH590 was used to modify nano-Al₂O₃ particles and deposited on the SMA surface, creating a three-dimensional nanostructure bridging SMA and PDMS to enhance interface strength. The synergistic effects of particle size and content of nano-Al₂O₃ particles on the interface strength were investigated in detail. It founds that interfacial strength decreased exponentially with particle size at content of 1 wt%, while when the content exceeds 1 wt%, the interface strength firstly increases with the particle size and then decreases in a logarithmic trend. Specifically, the interface strength is enhanced by 110 % with 3 wt% 50 nm particles. The interface enhancement mechanism was also discussed. The proposed nanoparticle modification approach was to strengthen SMA/PDMS interphase by increasing and extending fracture path, consuming more fracture energy. Chemical cross-linking also contributed to interface enhancement. This work enhances understanding of interfacial bonding mechanisms and provides valuable guide for interfacial strengthening of SMA/PDMS.

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纳米 Al2O3 尺寸和浓度对 SMA/PDMS 复合材料界面粘附性能的协同效应及其增强机制

由嵌入聚二甲基硅氧烷（PDMS）基体中的形状记忆合金（SMA）丝组成的软致动器具有形状变态结构和软机器人的潜力。然而，由于 SMA 表面光滑且无极性，因此与 PDMS 的粘合性较差。纳米粒子在聚合物复合材料的界面强化方面大有可为。在这项工作中，KH590 被用于改性纳米 Al2O3 粒子，并沉积在 SMA 表面，从而在 SMA 和 PDMS 之间形成三维纳米结构，增强界面强度。详细研究了纳米 Al2O3 颗粒的粒度和含量对界面强度的协同效应。研究发现，当粒径含量为 1 wt% 时，界面强度随粒径增大呈指数下降；而当粒径含量超过 1 wt% 时，界面强度先随粒径增大而增大，然后呈对数下降趋势。具体来说，3 wt% 的 50 nm 颗粒可使界面强度提高 110%。此外，还讨论了界面增强机制。所提出的纳米粒子改性方法是通过增加和延长断裂路径来增强 SMA/PDMS 相间，从而消耗更多的断裂能量。化学交联也有助于界面增强。这项研究加深了对界面结合机制的理解，为 SMA/PDMS 的界面强化提供了宝贵的指导。

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来源期刊

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.