RAFT (reversible addition fragmentation chain transfer) reagent as well as preparation method and application thereof

By designing novel RAFT reagents and their synthesis methods, the problem of insufficient photoresponsiveness in photocontrolled reversible addition-fragmentation chain transfer polymerization technology has been solved, enabling rapid photocuring and efficient large-scale production, which is suitable for photocuring 3D printing.

CN121021399AActive Publication Date: 2025-11-28SHANDONG UNIV
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Patent Information

Application Number
CN202511553034.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-29
Publication Date
2025-11-28
Estimated Expiration
2045-10-29

AI Technical Summary

Technical Problem

Existing photo-reversible addition-fragmentation chain transfer polymerization (Photo-RAFT) technology is insufficient in terms of photoresponsiveness, resulting in a prolonged polymerization induction period and a slow overall curing rate, which limits its application in high-speed photocuring scenarios.

Method used

A novel RAFT reagent is provided, wherein the Z group is an indazole derivative and the R group is a C3-C6 alkyl ester group. It is prepared by a one-pot synthesis process under low temperature conditions and has excellent rapid photoresponse characteristics and high triplet quantum yield, enabling rapid photocuring.

Benefits of technology

It achieves rapid photopolymerization, increased polymerization rate, and narrow molecular weight distribution, making it suitable for the field of photopolymerization 3D printing. It also achieves high-purity, high-efficiency, large-scale production by simplifying the synthesis process.

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Abstract

The invention discloses an RAFT (Reversible Addition-Fragmentation Chain Transfer) reagent as well as a preparation method and application thereof, and belongs to the technical field of RAFT reagent synthesis. The general formula of the RAFT reagent is shown in the specification, r1 to R5 are selected from any one of a hydrogen atom, a methyl group, a methoxyl group and a halogen atom; and R6 is selected from any one of alkyl ester groups of C3-C6. The RAFT reagent provided by the invention has a unique molecular structure, and shows excellent rapid light response characteristics, excellent initiation efficiency and relatively high triplet quantum yield. In the dynamic process, the polymer not only shows an extremely high polymerization rate, but also has excellent chain transfer capacity, and can be used for preparing acrylate and acrylamide polymers with narrower molecular weight distribution. Due to the characteristics, rapid curing of the resin can be realized, and the resin can be applied to the field of photocuring 3D printing.
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