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1. If you mix an ethylene oxide polyol that has been generated from pentaerythri

ID: 787878 • Letter: 1

Question

1.     If you mix an ethylene oxide polyol that has been generated from pentaerythritol with hexamethylene di-isocyanate, where the ratio of hydroxyl groups to isocyanate groups is 1:1, what fraction of the isocyanate groups must react to create a

If you mix an ethylene oxide polyol that has been generated from pentaerythritol with hexamethylene di-isocyanate, where the ratio of hydroxyl groups to isocyanate groups is 1:1, what fraction of the isocyanate groups must react to create a "Flory" gel?

Explanation / Answer

The rato between pentaerythritol and hexamethylene di-isocyanate is 1:2 .

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