Chemical route to polyurethane polymer Employed in manufacture of spandex. Spandex is mainly composed of a polyurea derived in the reaction of a diol along with a diisocyanate. Two classes of spandex are defined because of the "macrodiols". Just one class of macrodiols may be the oligomer created from tetrahydrofuran https://josepho407vww5.wikiconverse.com/user