Chemical route to polyurethane polymer used in creation of spandex. Spandex is especially composed of a polyurea derived in the response of the diol plus a diisocyanate. Two classes of spandex are defined because of the "macrodiols". Just one class of macrodiols is definitely the oligomer manufactured from tetrahydrofuran (i. https://jimmys529zab7.wikitron.com/user