Chapter 30: Q60P (page 1230)
The reaction of urea [(NH2)2 C=O] and formaldehyde (CH2=O) forms a highly cross-linked polymer used in foams. Suggest a structure for this polymer. [Hint: Examine the structures of Bakelite (Figure 30.7) and Melmac (Problem 30.58).]
Short Answer
Answer
Cross-linked polymer
Step by step solution
About urea
The organic compound that contains two NH2groups with one carbonyl group is called urea.This organic compound is a carbamide and has a very major role in metabolism in animals.
This compound is colorless and solid at room temperature having high solubility in water.
About the reaction
Urea and formaldehyde combine to form 1-(hydroxymethyl)urea. On rearrangement, it will give rise to a cation known as 1-methyleneuronium. It is again treated with urea which leads to the formation of 1,1'-methylenediurea. The reaction is shown below.
Chemical Reaction
Formation of cross-linked polymer
The steps are repeated, leading to the formation of the cross-linked polymer. The reaction is shown below.
Formation of cross-linked polymer
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