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<p>The synthesis of functionalized rubber copolymers is a topic of great research interest. In this study, we present a novel approach for the direct construction of <i>α</i>-functionalized 3,4-polyisoprene through polymerization of polar monomers and isoprene monomer. The <i>α</i>-functionalized 3,4-polyisoprene was successfully synthesized <i>via in situ</i> sequential polymerization using the iron-based catalytic system (Fe(acac)<sub>3</sub>/IITP/Al<sup><i>i</i></sup>Bu<sub>3</sub>), exhibiting high activity and resistance to polar monomers without requiring protection of polar groups. The structure of <i>α</i>-functionalized 3,4-polyisoprene was confirmed by proton nuclear magnetic resonance spectroscopy (<sup>1</sup>H-NMR) and two-dimensional diffusion-ordered spectroscopy (2D DOSY) spectra analysis. The introduction of polar groups, particularly hydroxyl groups, enhanced the hydrophilicity of the copolymer. This was evidenced by a decrease in the water contact angle from 106.9° to 96.4° with increasing hydroxyl content in the copolymer.</p>

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Synthesis and Characterization of α-End Functionalized 3,4-Polyisoprene Using Fe(acac)3/IITP/AliBu3 Catalyst

  • 期刊论文

  • 发表日期：

    2025年6月20日

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  • Yu-Fan Sun,
  • Ying-Nan Zhao,
  • Shi-Liang Xu,
  • Yao Yu,
  • Liang Fang,
  • Li-Hua Na,
  • Qi Yang,
  • Feng Wang,
  • Heng Liu,
  • Chun-Yu Zhang,
  • Xue-Quan Zhang

摘要

The synthesis of functionalized rubber copolymers is a topic of great research interest. In this study, we present a novel approach for the direct construction of α-functionalized 3,4-polyisoprene through polymerization of polar monomers and isoprene monomer. The α-functionalized 3,4-polyisoprene was successfully synthesized via in situ sequential polymerization using the iron-based catalytic system (Fe(acac)3/IITP/AliBu3), exhibiting high activity and resistance to polar monomers without requiring protection of polar groups. The structure of α-functionalized 3,4-polyisoprene was confirmed by proton nuclear magnetic resonance spectroscopy (1H-NMR) and two-dimensional diffusion-ordered spectroscopy (2D DOSY) spectra analysis. The introduction of polar groups, particularly hydroxyl groups, enhanced the hydrophilicity of the copolymer. This was evidenced by a decrease in the water contact angle from 106.9° to 96.4° with increasing hydroxyl content in the copolymer.