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J. Pielichowski, P. Król


Studies on the effects of an aromatic oligoetherdiol on the physical and mechanical characteristics

of linear polyurethanes prepared from toluylenediisocyanate and polyoxypropylene glycol


Polimery 1988, No 5, 182


DOI: dx.doi.org/10.14314/polimery.1988.182

Summary

The method of mathematical design of experiments has been applied to the investigation on the effect of an aromatic oligoetherdiol prepared from 2,2-bis(p-hydroxy)phenylpropane on the mechanical properties and glass transition temperature of PUR resins, It has been found that the mechanical and thermal properties of urethane elastomers on the basis of this oligoetherdiol and a mixture of isomers of 2,4- and 2,0-diisocyanate of toliiylene can be considerably modified by an introduction in various stages of the synthesis of an appropriate amount of phenyl rings from both components. At the same time it has been demonstrated that PUR resins under study reveal have two glass transition temperatures characteristic both for the soft polyoxypropylene segments (Tg1 about 240 K) and for the rigid aromatic segments (Tg2 about 300 K). The introduction of a higher number of phenyl rings does not change the lower value and has a negligible effect on the higher value of the glass transition temperature.



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