Lu Pengpeng, Li Xin, Xu Jingyang, Fan Yong, Sun Jiyu, Liang Yunhong, Tian Limei, Ming Weihua, Ren Luquan, Zhao Jie
Key Laboratory of Bio-inspired Engineering, Ministry of Education, Jilin University, Changchun, 130022, China.
College of Chemistry, Jilin University, Changchun, 130022, China.
Small. 2024 Jul;20(30):e2312037. doi: 10.1002/smll.202312037. Epub 2024 Feb 26.
The flexible protective coatings and substrates frequently exhibit unstable bonding in industrial applications. For strong interfacial adhesion of heterogeneous materials and long-lasting adhesion of flexible protective coatings even in harsh corrosive environments. Inspired by the interdigitated structures in Phloeodes diabolicus elytra, a straightforward magnetic molding technique is employed to create an interlocking microarray for reinforced heterogeneous assembly. Benefiting from this bio-inspired microarrays, the interlocking polydimethylsiloxane (PDMS) coating recorded a 270% improvement in tensile adhesion and a 520% increase in shear resistance, approaching the tensile limitation of PDMS. The elastic polyurethane-polyamide (PUPI) coating equipped with interlocking structures demonstrated a robust adhesion strength exceeding 10.8 MPa and is nearly unaffected by the corrosion immersion. In sharp contrast, its unmodified counterpart exhibited low initial adhesion and maintain ≈20% of its adhesion strength after 30 d of immersion. PUPI coating integrated with microarrays exhibits superior resistance to corrosion (30 d, |Z| ≈10Ω cm, R≈10 Ω cm), cavitation and long-term adhesion retention. These interlocking designs can also be adapted to curved surfaces by 3D printing and enhances heterogeneous assembly of non-bonded materials like polyvinylidene fluoride (PTFE) and PDMS. This bio-inspired interlocking structures offers a solution for durably bonding incompatible interfaces across varied engineering applications.
在工业应用中，柔性防护涂层与基底之间的结合往往不稳定。为了实现异质材料之间的强界面附着力，以及柔性防护涂层即便在恶劣腐蚀环境下仍能保持持久附着力。受恶魔隐翅虫鞘翅交错结构的启发，采用了一种简单的磁成型技术来创建用于增强异质组装的互锁微阵列。受益于这种仿生微阵列，互锁聚二甲基硅氧烷（PDMS）涂层的拉伸附着力提高了270%，抗剪切力提高了520%，接近PDMS的拉伸极限。配备互锁结构的弹性聚氨酯-聚酰胺（PUPI）涂层表现出超过10.8 MPa的强大附着力，且几乎不受腐蚀浸泡的影响。形成鲜明对比的是，其未改性的对应物初始附着力较低，浸泡30天后其附着力强度仅维持约20%。集成微阵列的PUPI涂层表现出卓越的抗腐蚀性能（30天，|Z|≈10Ω·cm，R≈10Ω·cm）、抗空蚀性能以及长期附着力保持能力。这些互锁设计还可通过3D打印应用于曲面，并增强聚偏二氟乙烯（PTFE）和PDMS等非粘结材料的异质组装。这种仿生互锁结构为跨各种工程应用持久粘结不相容界面提供了一种解决方案。
