Elastomers from polytetrahydrofuran

Nakayama, K., Ino, T., and Matsubara, I. (1969). Infrared spectra and structure of polyurethane elastomers from polytetrahydrofurane, diphenylmethane-4,4 -diisocyanate, and ethylenediamine. J. Macromol. Sci. Chem., 3 1005-1020. 

Thus, from high MW diols (MW = 1000-4000 daltons) polyethers (polyalkyleneoxides, polytetrahydrofuran (PTHF)), polyesters, polycarbonates (PC), polybutadienes, etc., by the reaction with diisocyanates [toluene diisocyanate (TDI), or pure diphenyl methane diisocyanate (MDI)], high MW linear polyurethanes are obtained (no crosslinking), with high elasticity (polyurethane elastomers, spandex fibres, some adhesives and sealants, etc). 

Polytetrahydrofuran (polytetramethylene ether, PTHF) n, A type of polycol made from tetrahydrofuran by ring opening, have the mer [-CH2(CH2)3-0-] and -OH end groups, with low to moderate molecular weights. These polymers have long been used as pre-polymers for polyurethane elastomers. 

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