Synthesis and Properties of Polyurethane Elastomers with Castor Oil as Crosslinker |
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Authors: | Stefan Oprea |
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Affiliation: | (1) Petru Poni Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda No.41-A, 700487 Iasi, Romania |
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Abstract: | Castor oil–polyurethane elastomers were prepared by reacting poly (1,4-butane diol) (Terathane 1400) with aliphatic 1,6-hexamethylene
diisocyanate. The prepolymers were chain-extended with bifunctional precursor chains and/or with castor oil as a trifunctional
crosslinker at stoichiometric ratios. These resulted in a series of crosslinked polyurethane elastomers with different structures
of the hard segment. The properties of the material were measured by differential scanning calorimetry, thermogravimetric
analysis, atomic force microscopy, as well as tensile properties measurements. The effect of stoichiometric balance (i.e.,
OH/NCO molar ratio) on the final properties was evaluated. The formation of hydrogen bonds was observed by Fourier transform
infrared.spectroscopy The measured properties were found to be strongly influenced by the molar ratio of chain extenders to
the diisocyanate component. The glass transition temperatures (T
g) for the polyurethanes with OHpolyol/NCO/OHchain extender having molar ratios of 1:2:1 and 1:4:3 were found to be −70 and −57 °C, respectively. The polyurethanes networks with a OH/NCO
molar ratio of 1:2:1 had excellent mechanical properties, indicating that this is the optimum ratio to be used in castor oil
polyurethane elastomer formulations. The objective of this work was to study the effect of the castor oil crosslinker on the
morphology of the resulting crosslinked polyurethanes and to correlate the morphology with the properties of these bio-based
crosslinked polyurethanes. |
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