Abstract
The demand of vegetable oils by several sectors of the chemical industry is growing at a fast pace fueled by the fossil oil scarcity, its unpredictable price fluctuations and the ever increasing environmental concerns. The present work reports for the first time the synthesis of polyols and polyurethanes (PUs) from linseed seed (Linum usitatissimun L.) and passion fruit (Passiflora edulis Sims f. flavicarpa Degener) oils. The in situ epoxidation and hydroxylation of vegetable oils in a single step was successfully accomplished using a mixture of hydrogen peroxide (H2O2) and formic acid. Kinetic studies were performed on this system. The oils and the corresponding polyols were characterized by Fourier transform infrared (FT-IR), gel permeation chromatography (GPC) and thermogravimetry (TG)/derivative termogravimetry (DTG). The PUs were characterized by FT-IR, TG/DTG, dynamic mechanical analysis (DMA) and scanning electron microscopy (SEM). The study revealed a marked deviation on the properties between the starting materials and the end products. The PUs produced showed similar dynamic mechanical properties.
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Acknowledgments
The authors thank the National Council of Technological and Scientific Development (CNPq), the Institute of Chemistry at the University of Brasilia (IQ/UnB) and Coordination of Improvement of Higher Education Personnel (CAPES) for financial support.
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de Vasconcelos Vieira Lopes, R., Loureiro, N.P.D., Pezzin, A.P.T. et al. Synthesis of polyols and polyurethanes from vegetable oils–kinetic and characterization. J Polym Res 20, 238 (2013). https://doi.org/10.1007/s10965-013-0238-x
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DOI: https://doi.org/10.1007/s10965-013-0238-x