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08-06-2020 | ORIGINAL ARTICLE | Issue 6/2020

Journal of Material Cycles and Waste Management 6/2020

Recycled-based thermosetting material obtained from the decomposition of polyurethane foam wastes with castor oil

Journal:
Journal of Material Cycles and Waste Management > Issue 6/2020
Authors:
Vladimir Valle, Cristina Aguirre, Miguel Aldás, Miguel Pazmiño, Cristina E. Almeida-Naranjo
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Abstract

In this work, a castor-oil-based process for flexible polyurethane foam scrap decomposition was used to prepare a recycled-based polyurethane foam. Decomposed polyurethane (DP) and 4,4′ diphenylmethane diisocyanate (MDI) were polymerized at three distinct MDI/DP ratios (1.0/2.2, 1.0/2.7 and 1.0/3.2) and two curing times (15 and 50 min). The influence of castor oil on the decomposition process and subsequent synthesis of polyurethane foam were evaluated using Fourier transform infrared spectroscopy (FTIR). Further characterization of the final material was carried out through thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and mechanical testing. FTIR assessment showed the presence of multi-functional hydroxyl groups as a result of the decomposition process. TGA confirmed three thermal degradation zones between 160 ℃ and 535 ℃ indicating the degradation of non-reacted compounds as well as the presence of oligomers, fatty acid chains, and urethane network. Mechanical evaluation evidenced that the MDI/DP ratios had a significant effect on tensile properties. The addition of DP increased the elongation at break and reduced the tensile strength with a slight variation of curing time. From the perspective of pore size, SEM micrographs exhibited that cell size apparently decreased with the addition of the DP.

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