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Cashewnut husk; benzoylated tannin; polyurethane.

Benzoylated tannin prepared by benzoylation of cashewnut husk tannin, was treated with hexame-thylenediisocyanate in the presence of 1,4-butanediol as an extender to prepare thermosetting polyurethane. The sample was characterized using FT–IR and ¹³C NMR spectra. Thermal, morphological, physico-chemical and electrical properties were also investigated. Polyurethane obtained was sensitive to moisture but had very good solvent resistance. Results show that 𝑇_g of the sample is 260 °C and thermal decomposition begins at 280 °C. The dielectric constant varies randomly with temperature. The conductivity of the sample was found to increase with increase in temperature but shows random variation at 90 and 150 °C

A J Sunija¹ S Siva Ilango² K P Vinod Kumar¹

1. Department of Chemistry, University College of Engineering Nagercoil, Anna University, Nagercoil 629 004, India
2. Department of Chemistry, Thiagaraja College of Engineering, Madurai 625 015, India

Published

May 2014

Manuscript received

27 February 2013

Manuscript revised

19 April 2013