Open Access

ARTICLE

Synthesis and Characterization of Novel Castor Oil-Based Polyol for Potential Applications in Coatings

Azam Sardari^1,2, Ali Asghar Sabbagh Alvani^1,2,3,*, Seyed Reza Ghaffarian^1,2

1 Color & Polymer Research Center (CPRC), Amirkabir University of Technology, Tehran, 158754413, Iran.
2 Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, Tehran, 158754413, Iran.
3 Advanced Materials Group, Iranian Color Society (ICS), 1591637144, Tehran, Iran.

*Corresponding Author: Ali Asghar Sabbagh Alvani. Email: .

Journal of Renewable Materials 2019, 7(1), 31-40. https://doi.org/10.32604/jrm.2019.00045

Abstract

In this study, three sorts of polyols were successfully synthesized from castor oil using a Dean-Stark quick, eco-friendly and high-efficiency method. For this purpose, castor oil was epoxidized in the presence of two types of catalysts including γ-alumina and formic acid, named as ECOAl and ECOF, respectively. Epoxidized castor oils were then characterized by use of hydrogen nuclear magnetic resonance (H-NMR) and oxirane oxygen content analysis. The relative percentages of conversion double bond to oxirane were obtained 96% and 74% for ECOAl and ECOF, respectively. Ring opening reaction of ECOAl was performed by two types of saponified castor oil as well as castor oil in a system equipped with Dean–Stark apparatus. The synthesized polyols were characterized by attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC), viscometer and OH number evaluation. The material obtained in this research is a candidate to be intended in synthesis of polyurethane for coating applications.

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