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Synthesis and characterization of novel renewable castor oil-based UV-curable polyfunctional polyurethane acrylate

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Abstract

In recent years, a lot of interest has been given to renewable resources for their environmental friendliness and potential biodegradability in the synthesis of urethane-derived polymers. In this work, UV-curable castor oil-based polyfunctional polyurethane acrylate (COPUA) was prepared by the reaction of isophorone diisocyanate (IPDI) with castor oil and pentaerythritol triacrylate (PETA). The structures and molecular weights of the targeted IPDI–PETA and COPUA were characterized by FTIR, 1H NMR, and GPC, respectively. In addition, the effect of reactive diluent content on damping properties, thermal stabilities, and mechanical properties of COPUA was characterized by dynamic mechanical analysis (DMA), thermogravimetric analysis (TGA), and universal test machine. DMA revealed the copolymers had a glass transition temperature (T g) from 31.81 to 48.09°C. TGA showed that thermal initial decomposition temperatures were above 344.5°C, indicating the copolymers had certain thermal stability. Finally, some physical properties of curing films were studied by the contact angle and water absorption, and the results showed that the coatings exhibited good hydrophobicity. The COPUA obtained from castor oil can be used as eco-friendly materials and other applications alternative to the use of other petrochemicals in coatings.

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Acknowledgments

This research was financially supported by Natural Science Foundation of Jiangsu Province (Grant No. BK20161122) and Major State Research & Development Program of China (Grant No. 2016YFD0600802).

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Authors and Affiliations

  1. Institute of Chemical Industry of Forestry Products, Chinese Academy of Forest, Nanjing, 210042, Jiangsu Province, China

    Yun Hu, Chengguo Liu, Qianqian Shang & Yonghong Zhou

  2. Institute of New Technology of Forestry, Chinese Academy of Forestry, Beijing, 100091, China

    Yonghong Zhou

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  1. Yun Hu
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  2. Chengguo Liu
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Correspondence to Yonghong Zhou.

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Hu, Y., Liu, C., Shang, Q. et al. Synthesis and characterization of novel renewable castor oil-based UV-curable polyfunctional polyurethane acrylate. J Coat Technol Res 15, 77–85 (2018). https://doi.org/10.1007/s11998-017-9948-z

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  • DOI: https://doi.org/10.1007/s11998-017-9948-z

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