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Materiale Plastice
https://doi.org/10.37358/Mat.Plast.1964

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ISSN 0025-5289
ISSN 2668-8220 (online)
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Materiale Plastice, Volume 47, Issue 1, pp. (2010)




STEFAN OPREA, VERONICA OPREA Influence of Crosslinkers on Properties of New Polyurethane Elastomers


Abstract:
A series of poly(ester urethane)s were synthesized, containing, poly(e-caprolactone) diol of Mn= 2000 as soft segments. Each series used the same diisocyanate in the hard segment, i.e., 1,6 hexamethylene diisocyanate, with the same content. The polyurethane polymers were prepared by a two-step polymerization in the absence of catalyst, at the molar ratio of OHsoft segment /NCO/ OH chain extenders = 1/2/1. The chain extenders were 1,12-dodecan diol, glycerin and castor oil. For all polymers the structures were determined by FTIR, the physico-chemical and thermal properties were determined by thermogravimetric analysis and additionally tensile properties as well as Shore A hardness were analyzed. Poly(ester urethane)s with castor oil exhibited higher tensile strength (up to 27 MPa vs 30 MPa) and elongation at break (up to ~780% vs. 1000%) in comparison with the corresponding glycerin poly(ester urethane)s. Keywords: polyurethane elastomers, chain extenders, crosslinkers, mechanical properties, thermal behaviour



Issue: 2010 Volume 47, Number 1
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