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<p>To improve the suitability of the UV-curable materials for flexible devices, the hydroxy-terminated polybutadiene (HTPB) with a pure carbon main chain structure was employed as the diol to design HTPB-based polyurethane acrylate (PUA). The effect of the typology of diisocyanate and the molecular weight of HTPB on the mechanical property and photopolymerization kinetics of PUAs were investigated, and the PUA (H<sub>1</sub>-I) synthesized from the isophorone diisocyanate and the highest molecular weight HTPB (H<sub>1</sub>) showed the highest toughness and the tensile strength comparing to other HTPB-based PUAs as well as the oxygen-containing main chains, polyether- and polyester-based species. Furthermore, a series of formulas based on the H<sub>1</sub>-I were constructed, and the influence of monomer combinations was studied. The results demonstrated that a suitable combination of monomers could improve the tensile strength while maintaining the toughness compared with the pure resin, which enables the synthesized PUAs to have good application potential.</p>

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Synthesis and properties of HTPB-based UV-curable polyurethane acrylate with high flexibility

  • 期刊论文

  • 发表日期：

    2026年3月4日

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  • Pengfei Lou,
  • Shen Zhou,
  • Ziqiu Fang,
  • Miao Yao,
  • Jun Nie,
  • Yong He

摘要

To improve the suitability of the UV-curable materials for flexible devices, the hydroxy-terminated polybutadiene (HTPB) with a pure carbon main chain structure was employed as the diol to design HTPB-based polyurethane acrylate (PUA). The effect of the typology of diisocyanate and the molecular weight of HTPB on the mechanical property and photopolymerization kinetics of PUAs were investigated, and the PUA (H1-I) synthesized from the isophorone diisocyanate and the highest molecular weight HTPB (H1) showed the highest toughness and the tensile strength comparing to other HTPB-based PUAs as well as the oxygen-containing main chains, polyether- and polyester-based species. Furthermore, a series of formulas based on the H1-I were constructed, and the influence of monomer combinations was studied. The results demonstrated that a suitable combination of monomers could improve the tensile strength while maintaining the toughness compared with the pure resin, which enables the synthesized PUAs to have good application potential.