4D printing is an emerging manufacturing technology that enables3D printingThe structure changes the configuration in the fourth dimension in response to environmental stimuli including heat, water, magnetic field and electricity. Since it can seamlessly and quickly create an integrated actuator-mechanism system, 4D printing is
aerospace
, Smart furniture, minimally invasive equipment, soft robots and other fields show great potential. 4D printing is through the use of environmentally responsive soft active materials (SAMs)3D printingThe structure realized mainly includes hydrogels, liquid crystal elastomers (LCEs), and shape memory polymers (SMPs).Different from the other two extremely soft and soft active materials, SMP can switch the material modulus from several MPa to several GPa within 1 minute, and is compatible with various3D printingtechnology. So far, SMP-based 4D printing has been widely used in smart devices, origami, tissue engineering, metamaterials,
biology
medicine
And so on in various fields.
UV curing based on digital light processing can manufacture complex geometric structures and high-resolution structures based on SMP. However, UV-curable SMP has limitations in terms of mechanical properties, which greatly limits its application range.The team of Biao Zhang from Northwestern Polytechnical University reported a mechanically robust, UV-curable SMP system that is highly deformable, fatigue-resistant, and DLP-based3D printingCompatible, high-resolution (up to 2 microns), highly complex 3D structures can be manufactured, and the shape changes greatly after heating (up to 1240%).
More importantly, the developed SMP system has good anti-fatigue performance and can be repeatedly loaded more than 10,000 times.The development of mechanical robustness and UV curing SMP has significantly improved the mechanical properties of SMP-based 4D printed structures, which allows them to be applied to engineering applications such as
aviation
Aerospace, smart furniture and soft robots.
(Editor in charge: admin)
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