浙江大学谢涛研究团队近日取得一项新成果。经过不懈努力，他们开发出通过解离网络设计实现高性能光聚合物的圆形3D打印。该项研究成果发表在2025年4月11日出版的《科学》上。

该研究团队报告了三维（3D）打印化学通过形成二硫缩醛键逐步光聚合。通过解离二硫缩醛键，聚合网络可以转化回光反应性低聚物。这种网络-低聚物转换是可逆的，因此允许圆形3D打印主题相同的材料。他们的方法提供了在设计聚合物网络主干时进行模块化调整的灵活性。这样就可以获得完全可回收的弹性体、结晶聚合物和具有高机械韧性的刚性玻璃聚合物，使它们可能适用于各种应用。

据介绍，闭环塑料回收的一种方法是将聚合物还原为单体，这样就可以在不损失性能的情况下制造新的塑料。这种解聚要求限制了分子设计以制造具有高机械性能的聚合物。

附：英文原文

Title: Circular 3D printing of high-performance photopolymers through dissociative network design

Author: Bo Yang, Tiantian Ni, Jingjun Wu, Zizheng Fang, Kexuan Yang, Ben He, Xingqun Pu, Guancong Chen, Chujun Ni, Di Chen, Qian Zhao, Wei Li, Sujing Li, Hao Li, Ning Zheng, Tao Xie

Issue&Volume: 2025-04-11

Abstract: One approach for closed-loop plastics recycling relies on reverting polymers back into monomers because one can then make new plastics without loss of properties. This depolymerization requirement restricts the molecular design to making polymers with high mechanical performance. We report a three-dimensional (3D) printing chemistry through stepwise photopolymerization by forming dithioacetal bonds. The polymerized network can be transformed back into a photoreactive oligomer by dissociation of the dithioacetal bonds. This network-oligomer transformation is reversible, therefore allowing circular 3D printing using the same material. Our approach offers the flexibility of making modular adjustments in the design of the network backbone of a polymer. This allows access to fully recyclable elastomers, crystalline polymers, and rigid glassy polymers with high mechanical toughness, making them potentially suitable for diverse applications.

DOI: ads3880

Source: https://www.science.org/doi/10.1126/science.ads3880