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Open AccessArticle

Thermoplastic Polyurethanes Stemming from Castor Oil: Green Synthesis and Their Application in Wood Bonding

Aviation Engineering Institute, Civil Aviation Flight University of China, Guanghan 618307, China
Author to whom correspondence should be addressed.
Academic Editor: Jan Honzíček
Coatings 2017, 7(10), 159;
Received: 27 July 2017 / Revised: 12 September 2017 / Accepted: 21 September 2017 / Published: 29 September 2017
(This article belongs to the Special Issue Binders, Pigments, Dyes and Additives)
We report an efficient and green approach to synthesize a linear castor oil-based polyurethane (CPU) without using any solvent or catalyst. Diol monomers were first synthesized by the aminolysis reaction between castor oil and diamines; this was accomplished within 6 h at 130 °C. Polymerization of the diols and isocyanate was further confirmed by Fourier transform infrared (FTIR), 1H-nuclear magnetic resonance (1H-NMR), and gel permeation chromatography analyses. The resultant CPUs showed a good thermal stability with an initial degradation temperature higher than 300 °C, and their mechanical and wood bonding property can be modulated by the structures of diamine. In addition, the CPUs possessed a satisfying water resistance property with the water absorption amount lower than 2%. The green conversion of castor oil to thermoplastic polyurethane affords new opportunities in bio-based industries. View Full-Text
Keywords: castor oil; linear polyurethane; catalyst-free; solvent-free castor oil; linear polyurethane; catalyst-free; solvent-free
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Li, S.; Xu, C.; Yang, W.; Tang, Q. Thermoplastic Polyurethanes Stemming from Castor Oil: Green Synthesis and Their Application in Wood Bonding. Coatings 2017, 7, 159.

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