Copolymer gel, 4D micro-nano printing material, and printing test method

Abstract

The invention discloses a copolymer gel, a 4D micro-nano printing material, and a printing test method. The copolymer gel comprises: reactants comprising a functional monomer N-isopropyl acrylamide and acrylic acid; a cross-linking agent DPEPA; a photosensitizer triethanolamine; and a photoinitiator EMK. According to the present invention, the hydrogel-based 4D micro-nano printing material especially has good photocuring performance and good heterogeneous swelling property to two-photon 780 nm femtosecond laser, can print complex three-dimensional micro-nano structures with submicron precisionin photoresists without supporting materials, and can achieve the controlled deformation from three-dimensional to three-dimensional by designing the local difference in the structure under the stimulation of the pH value, the organic solvent and the temperature.

Description

technical field [0001] The invention relates to the field of 4D printing, further relates to a copolymer gel, also relates to a micro-nano printed object, and further relates to a printing test method. Background technique [0002] Polymer gels usually consist of cross-linked polymeric chains or complex networks of natural or synthetic polymers. Natural gels usually do not have properties such as photocuring, so it is not easy to be directly used in 3D printing to form stable functional micro-nano structure devices. Through the integration of natural hydrogel and synthetic hydrogel materials, the development of photocurable biomimetic hydrogel materials with environmental response characteristics, combined with 3D micro-nano printing technology, the construction of multifunctional biomimetic materials and structural systems, in biomedical engineering The field has important application prospects. [0003] The three-dimensional laser direct writing technology is based on th...

AI Technical Summary

Problems solved by technology

[0004] Most of the existing printable environment-responsive hydrogel materials are based on two-dimensional lithography technology, which cannot realize the preparation of three-dimensional structures; active-response hydrogel materials based on three-dimensional laser direct writing technology are not strong enough to print suspended structures, so they cannot Realize complex 3D structures designed arbitrarily in space

[0005] In addition, recent reports achieve material differentiation through multiple material steps, requiring extremely high printing repeatability and complex processes, and target structures with residual material substrates

[0006] And the currently reported 3D laser direct writing technology of 4D printable hydrogel materials cannot achieve high swelling differentiation (the expansion-shrinkage ratio difference rate under the maximum heterogeneity is less than 1.5), which directly affects the deformation of the micro-nano functional structure volume and programmability

[0007] In addition, most of the existing 4D printing hydrogel materials are single-trigger-response hydrogels, which cannot achieve multiple composite trigger-response

[0008] Moreover, the swelling property of the hydrogel directly written by 3D laser is poorly stable, and it is impossible to accurately control the deformation of the material with the exposure power. Therefore, it is impossible to analyze the deformation process of the hydrogel-based micro-nano structure by using finite elements.

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