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Preparation, Characterization and Application of UV-Curable Flexible Hyperbranched Polyurethane Acrylate
Hongping Xiang1, Xiaowei Wang2, Guanghong Lin3
1Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China. lyzxhp@163.com.
Polymers
|April 11, 2019
Summary
A new flexible UV-curable hyperbranched polyurethane acrylate (FHBPUA) was synthesized. This material enhances UV-curing speed, flexibility, and mechanical properties in epoxy acrylate resins.
Area of Science:
- Polymer Chemistry
- Materials Science
Background:
- Hyperbranched polymers offer unique properties.
- Polyurethane acrylates are key in UV-curable systems.
Purpose of the Study:
- Synthesize a novel UV-curable hyperbranched polyurethane acrylate (FHBPUA).
- Evaluate FHBPUA as a functional additive for epoxy acrylate resins.
Main Methods:
- Synthesis of FHBPUA via reaction of hydroxyl-terminated hyperbranched polyurethane with urethane monoacrylate.
- Characterization of FHBPUA structure and properties (degree of branching, thermal decomposition, glass transition temperature).
- Formulation of epoxy acrylate resins with varying FHBPUA content.
Main Results:
- FHBPUA synthesized with a degree of branching of 0.82, glass transition temperature of 65 °C.
- FHBPUA films exhibit rapid UV-curing (3 s) and high flexibility (1 mm).
- Addition of 10 wt% FHBPUA reduced UV-curing time, enhanced flexibility and adhesion, without affecting glossiness of epoxy acrylate resin.
Conclusions:
- Novel FHBPUA demonstrates excellent flexibility and UV-curability.
- FHBPUA effectively improves mechanical properties (tensile strength, elongation at break) of epoxy acrylate resins.
- FHBPUA is suitable for flexible freestanding films and as an additive in coatings, inks, and 3D printing applications.
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