Pan Xiaofeng, Li Jiajia, Li Zhuang, Li Qing, Pan Xiangqiang, Zhang Zhengbiao, Zhu Jian
State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China.
Angew Chem Int Ed Engl. 2024 Mar 4;63(10):e202318564. doi: 10.1002/anie.202318564. Epub 2024 Jan 26.
Photoinduced 3D printing based on the reversible addition-fragmentation chain transfer (RAFT) process has emerged as a robust method for creating diverse functional materials. However, achieving precise control over the mechanical properties of these printed objects remains a critical challenge for practical application. Here, we demonstrated a RAFT step-growth polymerization of a bifunctional xanthate and bifunctional vinyl acetate. Additionally, we demonstrated photoinduced 3D printing through RAFT step-growth polymerization with a tetrafunctional xanthate and a bifunctional vinyl acetate. By adjusting the molar ratio of the components in the printing resins, we finely tuned the polymerization mechanism from step-growth to chain-growth. This adjustment resulted in a remarkable range of tunable Young's moduli, ranging from 7.6 MPa to 997.1 MPa. Moreover, post-functionalization and polymer welding of the printed objects with varying mechanical properties opens up a promising way to produce tailor-made materials with specific and tunable properties.
基于可逆加成-断裂链转移（RAFT）过程的光诱导3D打印已成为一种用于制造多种功能材料的强大方法。然而，对这些打印物体的机械性能实现精确控制仍然是实际应用中的一项关键挑战。在此，我们展示了双官能黄原酸酯和双官能醋酸乙烯酯的RAFT逐步增长聚合。此外，我们还展示了通过四官能黄原酸酯和双官能醋酸乙烯酯的RAFT逐步增长聚合进行光诱导3D打印。通过调整打印树脂中各组分的摩尔比，我们将聚合机理从逐步增长精细调整为链增长。这种调整导致了杨氏模量的显著可调范围，从7.6兆帕到997.1兆帕。此外，对具有不同机械性能的打印物体进行后功能化和聚合物焊接，为生产具有特定和可调性能的定制材料开辟了一条有前景的途径。
