Question: Epoxy adhesives arc cross-linked resins prepared in two steps. The first step involves S N 2 reaction of the disodium salt of bisphenol A with

Epoxy adhesives arc cross-linked resins prepared in two steps. The first step involves S_N2 reaction of the disodium salt of bisphenol A with epichiorohydrin to form a low-molecular-weight prepolymer. This prepolymer is then ?cured? into a cross-linked resin by treatment with a triamine such as H₂NCH₂CH₂NHCH₂CH₂NH₂

(a) What is the structure of the prepolymer?

(b) How does addition of the triamine to the prepolymer result in cross-linking?

CH3 CH2-CH-CH2CI - HO- H3 Bisphenol A Epichiorohydrin

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