Chapter 28, Problem 61P

Interpretation Introduction

Interpretation: A structure for the highly cross-linked polymer, obtained from the reaction of urea $\left[\left({\text{NH}}_{\text{2}}\right)\text{C}=\text{O}\right]$ with formaldehyde $\left({\text{CH}}_{\text{2}}=\text{O}\right)$ is to be drawn.

Concept introduction: A thermosetting polymer has complex networks of covalent bonds, due to which it cannot be re-melted to bring in liquid phase. The chemical reaction for the formation of a thermosetting polymer is carried out in the presence of Lewis acid catalyst, which departs small molecules, like ${\text{H}}_{\text{2}}\text{O}$ as the by-product.