Polyurethanes are prepared by step growth polymerization of a diol and diisocyanate. 5. ch2(ch2)3 ch2 and the diisocyanate for the case in which the diol has the central group r1 has the central group r2 ch-оch, c(ch3)2: = но - r — он ocn r2 - nco > 0 - r1 - o - co - nh nh con r2 a) if 32 kg of the diol and 57 kg of the diisocyanate are loaded into a reactor and the polymerization taken to completion, what are the molecular weights and pdi of the polyurethane? b) if equimolar amounts of the diol and diisocyanate are loaded into the reactor and taken to 95% conversion (extent of reaction), what are the molecular weights and pdi of the polyurethane? c) calculate the molecular weights and pdi of a mixture of 10 kg of each of the products of parts (a) and (b) d) if you wanted to attempt to make this polyurethane with a molecular weight of mn 200,000 g/mol by adding some monofunctional groups and taking the reaction to full conversion, what fraction of the reactants would need to be monofunctional?

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.