Synthesis and characterization of different types of epoxide-based Mannich polyols from low-cost cashew nut shell liquid |
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Authors: | Tejas S Gandhi Mayank R Patel Bharatkumar Z Dholakiya |
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Institution: | 1. Department of Applied Chemistry, Sardar Vallabhbhai National Institute of Technology (SVNIT), Surat, 395007, Gujarat, India 2. Chemical Sciences Department, N. V. Patel College of Pure & Applied Sciences, Vallabh Vidyanagar, 388120, Gujarat, India
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Abstract: | Cashew nut shell liquid (CNSL) is a natural aromatic organic oil consisting of phenolic compounds with interesting structures. Extraction of CNSL was performed in a Soxhlet apparatus. The major (90 %) component of CNSL is anacardic acid, which is easily decarboxylated to cardanol (10 %) by use of conventional methods. In this paper we describe a three-step synthesis of Mannich polyols for rigid foams. The first step is synthesis of N-(2-hydroxyethyl)-1,3-oxazolidine (the Mannich precursor) by condensation of paraformaldehyde and diethanolamine. The second step involves synthesis of the Mannich base phenolic ring of cardanol by reaction with N-(2-hydroxyethyl)-1,3-oxazolidine. The third step is alkoxylation. The synthesized polyols were characterized by FTIR and 1H NMR spectroscopy and thin-layer chromatography. |
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