Epoxy adhesives are prepared in two steps. SN2 reaction of the disodium salt of bisphenol A with
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Epoxy adhesives are prepared in two steps. SN2 reaction of the disodium salt of bisphenol A with epichiorohydrin forms a ?prepolymer,? which is then ?cured? by treatment with a triamine such as H2NCH2CH2NHCH,CH2NH2,. Draw structures to show how addition of the triamine results in strengthening he polymer. Amines are good nucleophiles and can open epoxide rings in the same way other bases can.
Transcribed Image Text:
CH3 Аоне OLO- + Hас-снсн-с но -он ČH3 Epichlorohydrin Bisphenol A CHз CHз н Hас — снсн?- -о-сн-снсH2 -о-сн-сH—сH2 CHз CHз "Prepolymer"
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