Abstract In our research, a type of polyurethane acrylate is successfully synthesized and then compounded with epoxy acrylate and isobornyl acrylate as well as radical photoinitiator to get photopolymer. Afterwards, the photopolymer is applied through stereolithography 3D printing to fabricate shape memory polymers. The photopolymer is proved to have high UV-curing activity and the printing accuracy is high. Fold-deploy test and shape memory cycles measurements prove the excellent shape memory performance of the printed objects, including high shape recovery rate, shape fixity and recovery and excellent endurance. The shape fixity and recovery ratios are 96.77 ± 0.06% and 100.00 ± 0.08%, respectively. Tensile test at 70 °C shows that the recovery stress of printed objects can reach as high as 6.4 MPa. Mechanical test shows the printed objects have high strength and good toughness. With excellent shape memory performance, good mechanical properties and high printing accuracy, such material has great potential applications in many fields.

中文翻译：

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通过立体光刻技术 4D 打印形状记忆聚氨酯

摘要 在我们的研究中，成功​​合成了一类聚氨酯丙烯酸酯，然后与环氧丙烯酸酯和丙烯酸异冰片酯以及自由基光引发剂复合得到光聚合物。然后，通过立体光刻 3D 打印应用光聚合物来制造形状记忆聚合物。该光敏聚合物被证明具有高UV固化活性和高印刷精度。折叠展开测试和形状记忆循环测量证明了打印物体具有出色的形状记忆性能，包括高形状恢复率、形状固定和恢复以及出色的耐用性。形状固定率和恢复率分别为 96.77 ± 0.06% 和 100.00 ± 0.08%。70°C 拉伸试验表明，打印物体的恢复应力可高达 6.4 MPa。力学测试表明，打印的物体具有高强度和良好的韧性。这种材料具有优异的形状记忆性能、良好的机械性能和较高的印刷精度，在许多领域具有巨大的应用潜力。