Scholarlink

<p>In this study, five bio-based waterborne polyurethane acrylates (WPUAs) were synthesized using coconut oil fatty acid-derived alkyd polyol as the raw material. These WPUAs were end-capped with hydroxyethyl acrylate (HEA), hydroxyethyl methacrylate (HEMA), pentaerythritol triacrylate (PETA), as well as mixtures of PETA combined with either HEA or HEMA. The effect of hydroxyalkyl acrylate on dispersion stability, UV-curing behavior, and final coating performance was systematically investigated. FTIR confirmed complete NCO consumption and the successful incorporation of acrylate groups. The choice of end-capper significantly influenced particle size, storage stability, and crosslinking density of WPUAs. HEA provided good flexibility, while HEMA increased hardness due to its higher glass transition temperature. Incorporation of multifunctional PETA markedly enhanced crosslinking density, tensile strength, and chemical resistance, but excessive PETA led to embrittlement and reduced toughness. Importantly, the WPUA prepared with HEMA/PETA at a 1:1 molar ratio exhibited the most well-balanced performance, combining long thermal storage stability (&gt;30d), high tensile strength (26.1&#xa0;MPa), elevated Young’s modulus (379.3&#xa0;MPa), increased pencil hardness (2H), excellent adhesion (5B), good flexibility (1&#xa0;mm), and exceptional ethanol scrub resistance (1559 cycles). These findings demonstrate that hydroxyalkyl acrylate end-capping is a powerful strategy for tailoring the structure-property relationship of bio-based WPUAs, offering valuable guidance for the design of sustainable, high-performance UV-curable coatings.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Hydroxyalkyl acrylate end-capping strategy for bio-based waterborne polyurethane acrylates: enhancing crosslinking density and UV-curable coating performance

  • 期刊论文

  • 发表日期：

    2026年6月3日

查看全文
  • Ren Liu,
  • Zecheng Lin,
  • Deqiang Xie,
  • Yongbo Ding,
  • Liang Shen

摘要

In this study, five bio-based waterborne polyurethane acrylates (WPUAs) were synthesized using coconut oil fatty acid-derived alkyd polyol as the raw material. These WPUAs were end-capped with hydroxyethyl acrylate (HEA), hydroxyethyl methacrylate (HEMA), pentaerythritol triacrylate (PETA), as well as mixtures of PETA combined with either HEA or HEMA. The effect of hydroxyalkyl acrylate on dispersion stability, UV-curing behavior, and final coating performance was systematically investigated. FTIR confirmed complete NCO consumption and the successful incorporation of acrylate groups. The choice of end-capper significantly influenced particle size, storage stability, and crosslinking density of WPUAs. HEA provided good flexibility, while HEMA increased hardness due to its higher glass transition temperature. Incorporation of multifunctional PETA markedly enhanced crosslinking density, tensile strength, and chemical resistance, but excessive PETA led to embrittlement and reduced toughness. Importantly, the WPUA prepared with HEMA/PETA at a 1:1 molar ratio exhibited the most well-balanced performance, combining long thermal storage stability (>30d), high tensile strength (26.1 MPa), elevated Young’s modulus (379.3 MPa), increased pencil hardness (2H), excellent adhesion (5B), good flexibility (1 mm), and exceptional ethanol scrub resistance (1559 cycles). These findings demonstrate that hydroxyalkyl acrylate end-capping is a powerful strategy for tailoring the structure-property relationship of bio-based WPUAs, offering valuable guidance for the design of sustainable, high-performance UV-curable coatings.