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<p>CO<sub>2</sub> copolymer diol (PPCD) with superior transparency is an indispensable raw material for the polyurethane, especially for waterborne polyurethane coatings. However, commercial PPCD is generally opaque. In this work, A sustainable, colorless and transparent PPCD was prepared by using carbon dioxide (CO<sub>2</sub>) and propylene oxide (PO) as raw materials. Research shows that the increase in CO<sub>2</sub> content (from 23.5 wt.% to 31.5 wt.%) will affect the transparency and thermal stability of PPCD and the transparency of PPCD with 29.1 wt.% CO<sub>2</sub> content is even higher than 90%, while the 5 wt.% mass loss temperature reaches 240.1 ℃. Furthermore, a series of waterborne polyurethane (WPU) was successfully synthesized by prepolymer method with PPCD as the soft segment. With the increase of CO<sub>2</sub> content, the thermodynamic property of WPU was significantly improved. When CO<sub>2</sub> content increased from 23.50 wt.% to 31.50 wt.%, the tensile strength increased from 23.27&#xa0;MPa to 34.63&#xa0;MPa and the elongation at break decreased from 750.85% to 520.37%, accompanied by the glass-transition temperature increased from -49.7 ℃ to -34.5 ℃. In addition, it was found that WPU prepared by transparent PPCD has better tensile strength, transparency, and storage stability. A new inspiration was provided for its application in the fields of optical components, transparent medical materials and UV curable coatings.</p>

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Preparation of transparent CO2 copolymer diol and its properties on waterborne polyurethane

  • 期刊论文

  • 发表日期：

    2025年2月26日

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  • Wenqi Xian,
  • Maoyi He,
  • Rui Zheng,
  • Zhu Liu,
  • Ming Lu,
  • Yuehuan Chu,
  • Hao Cao

摘要

CO2 copolymer diol (PPCD) with superior transparency is an indispensable raw material for the polyurethane, especially for waterborne polyurethane coatings. However, commercial PPCD is generally opaque. In this work, A sustainable, colorless and transparent PPCD was prepared by using carbon dioxide (CO2) and propylene oxide (PO) as raw materials. Research shows that the increase in CO2 content (from 23.5 wt.% to 31.5 wt.%) will affect the transparency and thermal stability of PPCD and the transparency of PPCD with 29.1 wt.% CO2 content is even higher than 90%, while the 5 wt.% mass loss temperature reaches 240.1 ℃. Furthermore, a series of waterborne polyurethane (WPU) was successfully synthesized by prepolymer method with PPCD as the soft segment. With the increase of CO2 content, the thermodynamic property of WPU was significantly improved. When CO2 content increased from 23.50 wt.% to 31.50 wt.%, the tensile strength increased from 23.27 MPa to 34.63 MPa and the elongation at break decreased from 750.85% to 520.37%, accompanied by the glass-transition temperature increased from -49.7 ℃ to -34.5 ℃. In addition, it was found that WPU prepared by transparent PPCD has better tensile strength, transparency, and storage stability. A new inspiration was provided for its application in the fields of optical components, transparent medical materials and UV curable coatings.