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Preparation and properties of castor oil‐based polyurethanes
Author(s) -
Petrović Zoran S.,
Fajnik Dragica
Publication year - 1984
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1984.070290401
Subject(s) - castor oil , differential scanning calorimetry , isocyanate , polyurethane , polyol , materials science , elastomer , dynamic mechanical analysis , scanning electron microscope , polymer chemistry , glass transition , composite material , chemical engineering , organic chemistry , chemistry , polymer , physics , engineering , thermodynamics
Four series of polyurethane elastomers were synthesized using diphenylmethane diisocyanate (MDI) and castor oil as the polyol. Two types of MDI (crude and distilled) were used. The temperature of reaction and the effect of excess isocyanate above stoichiometric were also varied. The structure of the polyurethanes was analyzed using wide‐angle X‐ray diffraction, scanning electron microscopy, and density and differential scanning calorimetry (DSC). Thermomechanical and dynamic mechanical (TMA and DMA) as well as mechanical measurements were carried out. The results have shown considerable influence of the type of MDI, excess of isocyanate, and temperature of preparation on the properties of the polyurethanes synthesized.