Polyurethane-modified room-temperature curing epoxy super adhesive for artifact restoration and light emitting diode encapsulation

IF 7.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design Pub Date : 2024-11-26 DOI:10.1016/j.matdes.2024.113480

Peixin Niu , Diedie Xu , Jun Zhu , Zhiying Zhao , Ailing Sun , Liuhe Wei , Yuhan Li

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Abstract

Epoxy adhesives are widely used for their strong adhesion but face challenges due to high curing temperatures and brittleness, limiting their application in precision manufacturing and fine industries. In an innovative endeavor to address these limitations, we have synthesized a novel adhesive system by incorporating epoxy-functionalized polyurethane into the conventional bisphenol A-based epoxy resin. Upon subjecting the adhesive to a 24h curing period at ambient temperature, the resulting material exhibited remarkable mechanical properties. Specifically, the shear strength, tensile strength, and fracture toughness of the cured adhesive were 20.6 MPa, 36.7 MPa, and 2.87 MPa·m^1/2, respectively, while the unmodified epoxy resin had values of only 1.9 MPa, 15.5 MPa, and 1.0 MPa·m^1/2. Adhesive system unique crosslinked structure has been discovered to confer blue aggregation-induced emission fluorescent properties. We have successfully applied this interesting characteristic in the restoration of cultural relics and the encapsulation of light emitting diode. The research has yielded a groundbreaking adhesive formulation that not only overcomes the traditional limitations associated with epoxy materials but also introduces novel functionalities that extend its utility into diverse and sophisticated applications.

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用于文物修复和发光二极管封装的聚氨酯改性室温固化环氧超级粘合剂

环氧树脂粘合剂因其强大的粘合力而被广泛使用，但也面临着固化温度高和脆性大的挑战，限制了其在精密制造和精细工业中的应用。为了创新性地解决这些局限性，我们在传统的双酚 A 基环氧树脂中加入了环氧官能化聚氨酯，从而合成了一种新型粘合剂体系。粘合剂在环境温度下固化 24 小时后，所生成的材料表现出卓越的机械性能。具体来说，固化粘合剂的剪切强度、拉伸强度和断裂韧性分别为 20.6 兆帕、36.7 兆帕和 2.87 兆帕-m1/2，而未经改性的环氧树脂仅为 1.9 兆帕、15.5 兆帕和 1.0 兆帕-m1/2。研究发现，粘合剂系统独特的交联结构具有蓝色聚集诱导发射荧光的特性。我们已成功地将这一有趣特性应用于文物修复和发光二极管封装。这项研究产生了一种开创性的粘合剂配方，它不仅克服了环氧树脂材料的传统局限性，还引入了新的功能，将其用途扩展到多种复杂的应用领域。

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来源期刊

Materials & Design Engineering-Mechanical Engineering

CiteScore

14.30

自引率

7.10%

发文量

1028

审稿时长

85 days

期刊介绍： Materials and Design is a multi-disciplinary journal that publishes original research reports, review articles, and express communications. The journal focuses on studying the structure and properties of inorganic and organic materials, advancements in synthesis, processing, characterization, and testing, the design of materials and engineering systems, and their applications in technology. It aims to bring together various aspects of materials science, engineering, physics, and chemistry. The journal explores themes ranging from materials to design and aims to reveal the connections between natural and artificial materials, as well as experiment and modeling. Manuscripts submitted to Materials and Design should contain elements of discovery and surprise, as they often contribute new insights into the architecture and function of matter.