Polyimides

• Bismaleimide (BMI) resins

  • Addition polymerization
    • Reactions involving bismaleimide (BMI) derivatives: Fig 2-8
    • Case 1
      • Carbon-Carbon double bond in the maleimide group reacts with the carbon-carbon double bond in the olefin co-reactant (similar to maleic acid is crosslinked with styrene in polyester)
    • Case 2
      • An aromatic diamine adds to the carbon-carbon double bond of the maleimide in what is called Michaels Reaction.
    • Both cases: the coreactants (olefin or diamine) form bridges between the imide molecules to form a crosslinked structure
  • Commericial products
    • Ciba-Geigy uses an olefinic compound with two olefins

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