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Addition of further Bisphenol A and a catalyst and heat can produce Bisphenol A glycidyl ether epoxy resins of higher molecular weight that are solid. [8] Structure of bisphenol-A diglycidyl ether epoxy resin: n denotes the number of polymerized subunits and is typically in the range from 0 to 25
About 25–30% of all BPA is used in the manufacture of epoxy resins and vinyl ester resins. [9] [10] For epoxy resin, it is first converted to its diglycidyl ether (usually abbreviated BADGE or DGEBA). [44] [45] This is achieved by a reaction with epichlorohydrin under basic conditions. Some of this is further reacted with methacrylic acid to ...
However, aliphatic epoxy resins polymerize very slowly at room temperature, so higher temperatures and suitable accelerators are usually required. Because aliphatic epoxies have a lower electron density than aromatics, cycloaliphatic epoxies react less readily with nucleophiles than bisphenol A-based epoxy resins (which have aromatic ether groups).
The bisphenols (/ ˈ b ɪ s f ɪ n ɒ l /) are a group of industrial chemical compounds related to diphenylmethane; commonly used in the creation of plastics and epoxy resins. [ 1 ] [ 2 ] [ 3 ] Most are based on two hydroxyphenyl functional groups linked by a methylene bridge .
Diglycidyl ether of bisphenol-A epoxy resin structure Epoxy resin is used widely in numerous formulations and forms in the aircraft-aerospace industry. It is regarded as "the work-horse of modern day composites".
Diglycidyl ether itself is extremely toxic, and can prove fatal or cause permanent damage if inhaled or consumed orally. As a class of compounds, there are a number of them available commercially with much lower toxicity profiles. [3] [4] One such example is epoxy resin itself Bisphenol A diglycidyl ether.