From Castor Oil‐Based Multifunctional Polyols to Waterborne Polyurethanes: Synthesis and Properties

Yuehong Zhang*, Zhenqiang Wu, Lei Shi, Langlang Dai, Ruijing Liu, Lei Zhang, Bin Lyu*, Shunhua Zhao, Vijay Kumar Thakur*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)
64 Downloads (Pure)


A novel castor oil‐based multifunctional polyol (CM) is fabricated through mild thiol‐ene photo induced reactions using castor oil (CO) and 1‐thioglycerol (MPD) as building blocks. The effect of the reaction time, molar ratio of thiol to carbon–carbon double bond, and the loadings of photo‐initiator are optimized. The resulting CM is combined with CO and employed as cross‐linkers to prepare castor oil‐based water‐borne polyurethane emulsion with desirable mechanical properties and water resistance. Owing to the incorporation of CM cross‐linker with high hydroxyl value of 371 mg KOH/g (which is 2.27 times higher than that of the CO), the prepared castor oil‐based waterborne polyurethane (CMWPU) possesses compacted 3D network structure with high cross‐linking degree, leading to improved glass transition temperature (45 °C), tensile strength (10.8 MPa), water contact angle (87.4°), and decreased water absorption rate (16.12%) with 20% CM additions. Overall, this work illustrates the feasibility of introducing bio renewable CM combined with CO to develop castor oil‐based WPU employing a sustainable development strategy.
Original languageEnglish
Article number2200662
JournalMacromolecular Materials and Engineering
Issue number6
Early online date29 Jan 2023
Publication statusPrint publication - Jun 2023


  • castor oil
  • polyol
  • polyurethane
  • thiol‐ene click reaction
  • water resistance
  • thiol-ene click reaction


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