Chemical route to polyurethane polymer Employed in manufacture of spandex. Spandex is mainly composed of a polyurea derived from the response of a diol and also a diisocyanate. Two classes of spandex are outlined from the "macrodiols". Just one course of macrodiols will be the oligomer created from tetrahydrofuran (i. https://georgew851hhi0.eveowiki.com/user