Thermal and morphological study of polyurethanes based on Eucalyptus tar pitch and castor oil

This article presents the results of the synthesis and characterization of environmentally friendly polyurethanes based on renewable polyols, and specially highlights the use of Eucalyptus tar pitch, a byproduct of the charcoal making industry in Brazil, to obtain PUs. Eucalyptus tar pitch and casto...

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Bibliographic Details
Published in:Journal of applied polymer science 2004-06, Vol.92 (5), p.3287-3291
Main Authors: Melo, Breno N., Pasa, Vânya M. D.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
morphology
Physicochemistry of polymers
Polymer industry, paints, wood
polyurethanes
Technology of polymers
thermal properties
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Summary:This article presents the results of the synthesis and characterization of environmentally friendly polyurethanes based on renewable polyols, and specially highlights the use of Eucalyptus tar pitch, a byproduct of the charcoal making industry in Brazil, to obtain PUs. Eucalyptus tar pitch and castor oil PUs synthesized with MDI in THF, catalyzed by dibutyltin dilaurate, were prepared with NCO/OH equal to 1, and vacuum cured. The addition of Eucalyptus tar pitch to the formulation of PUs showed a tendency to increase the formation of rigid segments, and consequently, to modify thermal stability. SEM micrographs confirm this behavior, displaying different materials. Homogeneous polyurethane elastomers become rigid and acquire lamella structure with the addition of biopitch, as confirmed by tensile strength assays. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 3287–3291, 2004
ISSN:0021-8995
1097-4628
DOI:10.1002/app.20278