Polyurethanes can be made by the step growth polymerization based on the reaction between isocyanates (R-N=C=O) and alcohols. Predict the repeat unit and draw the reaction mechanism for the polymerization of 4,4'-methylenebis(phenylisocyanate) and ethylene glycol. O=C=N- H -N=C=O 4,4'-methylenebis(phenylisocyanate) HO. OH ethylene glycol
Polyurethanes can be made by the step growth polymerization based on the reaction between isocyanates (R-N=C=O) and alcohols. Predict the repeat unit and draw the reaction mechanism for the polymerization of 4,4'-methylenebis(phenylisocyanate) and ethylene glycol. O=C=N- H -N=C=O 4,4'-methylenebis(phenylisocyanate) HO. OH ethylene glycol
Chapter31: Synthetic Polymers
Section31.SE: Something Extra
Problem 13VC
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![Polyurethanes can be made by the step growth polymerization based on the reaction
between isocyanates (R-N=C=O) and alcohols. Predict the repeat unit and draw the reaction
mechanism for the polymerization of 4,4'-methylenebis (phenylisocyanate) and ethylene
glycol.
O=C=N-
-N=C=O
4,4'-methylenebis(phenylisocyanate)
HO
OH
ethylene glycol](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3960258a-226b-4f65-b265-c9d5c73dd12c%2Fba23ba7e-10c4-482c-b58b-8f1702cc1e10%2Fi18y4jf_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Polyurethanes can be made by the step growth polymerization based on the reaction
between isocyanates (R-N=C=O) and alcohols. Predict the repeat unit and draw the reaction
mechanism for the polymerization of 4,4'-methylenebis (phenylisocyanate) and ethylene
glycol.
O=C=N-
-N=C=O
4,4'-methylenebis(phenylisocyanate)
HO
OH
ethylene glycol
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