Castor urethane elastomers

Castor oil-urethane elastomers were prepared by reacting 2,4 tolylene diisocyanante, TDI, 80/20 2,4/2,6 TDI, or hexamethylene diisocyanate (HDI) with castor oil. The last reaction was rather slow and thus dibutyltin dilaurate, 0.001 gm per gm of HDI, was used as a catalyst. Since TDI hydrolyses significantly in the presence of trace amounts of water, DB grade castor oil from the Baker Castor Oil Company (NL Industries) was employed. 

Castor oil-urethane elastomers were prepared by reacting 2,4-tolylene diisocyanante, TDI, 80/20 2,4/2,6 TDI, or hexamethylene diisocyanate, HDI, with castor oil. The last reaction was rather slow and thus dibutyltin... 

In order to synthesize the IPN, the urethane elastomer was swelled with styrene containing 0.4% benzoin as initiator and 1% divinylbenzene (DVB) as crosslinker. Polymerization of the styrene was carried out by ultraviolet radiation at room temperature for 24 hr. The corresponding castor oil-poly ester/polystyrene SINs are discussed in Section 5.5. 

L. H. Sperling, J. A. Manson, G. M. Yenwo, N. Devia-Manjarres, J. Pulido, and A. Conde, Novel Plastics and Elastomers from Castor Oil Based IPN s A Review of an International Program, in Polymer Alloys, D. Klempner and K. C. Frisch, eds.. Plenum, New York (1977). Castor oil-urethane/polystyrene sequential IPNs. Synthesis, morphology, and mechanical behavior. Fatigue behavior. 

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