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2024
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09
Industry New Knowledge | Zhejiang University "Nature": The Preparation of Ultra-Strong 3D Printing Elastic Materials!
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Industry new knowledge
Recently, a team led by Professor Xie Tao of Zhejiang University and researcher Wu Jingjun published a research on 3D printable elastomers with exceptional strength and toughness in Nature to develop a new chemical strategy to realize high mechanical properties of light-cured materials through the introduction of dynamic covalent bonds.
Original link: https://www.nature.com/articles/s41586-024-07588-6
Adventure Technology official website: http://www.adventuretech.cn/
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research content
With the rapid development of three-dimensional (3D) printing technology, its application in the manufacturing industry is becoming more and more widespread, especially its excellent freedom in accessing geometrically complex customized products has attracted people's attention.
However, despite its great potential, it is currently facing challenges of low manufacturing efficiency and insufficient product quality. Specifically, traditional photopolymers often sacrifice the mechanical properties of the material during the rapid printing process, mainly due to the need for rapid light curing to achieve high-efficiency digital light processing (DLP) printing, and this rapid curing limits The freedom of molecular design affects the ultimate strength and durability of the material.
The core of this research strategy is to design a DLP precursor containing dynamic hindrance urea and side chain carboxyl. Through precise molecular design and chemical synthesis, the material can form complex molecular structures, including hierarchical hydrogen bonds and microphase separation structures, while curing light rapidly.These structural features not only improve the mechanical strength of the material, but also enhance its toughness and durability, making its tensile strength reach 94.6 MPa and toughness reach 310.4 MJ m-3, far exceeding the performance of traditional 3D printing materials.
△ Figure 1, Chemical design of 3D printed elastomers.
△ Figure 2, Mechanical properties of elastomers and their strengthening and toughening mechanisms.
△ Figure 3, Elastic and mechanical properties.
4,DLP printed tough elastomers.
research conclusion
In this paper, through dynamic covalent bond chemical design, the problem of limited freedom of molecular design in traditional light-curing 3D printing was overcome, and elastomers with excellent mechanical properties were successfully prepared.This study demonstrates how to use functional groups such as dynamic hindrance urea and side chain carboxyl groups to achieve dynamic reconfiguration of the network structure under rapid photopolymerization conditions. Through the formation of hierarchical hydrogen bonds, microphase separation and the establishment of interpenetrating structures, the tensile strength and toughness of the material are significantly improved, far exceeding the performance of traditional printing materials. This success not only solves the contradiction between the mechanical properties and printing characteristics of existing materials in 3D printing, but also provides a new material paradigm for future applications in the fields of automobiles, architecture, microfluidics, and soft robotics.
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