Low viscosity melt processable high temperature polyimides
AssigneeUniversity of Connecticut
InventorsDaniel A. Scola, Christopher D. Simone
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Abstract
A series of low melting and low viscosity phenylethynyl end-capped polyimides (PETIs) possessed of long term thermal and mechanical stability useful as films, melt coatings, adhesives, matrix and RTM resins and particular as coatings for optical fibers and phenylethynyl end-capped bismides blended with PETIs are disclosed. Processes for their production including: 1) modification of PETI-5 oligomer by molecular weight adjustments by blending with reactive low melting phenylethynyl end-capped imide monomers, 2) modification of the PETI-5 backbone structure with other diamine components, and 3) modification of the PETI-5 backbone with bulky fluorinated groups are also disclosed.
Claims26
A low viscosity and low melt processable polyimides selected from the group consisting of 1) blends of a PETI oligomer (2K, 3K and 5K) with a reactive phenylethynyl end-capped bisimide diluents, 2)cyclohexane modified phenylethynyl end-capped random trifunctional imide oligomers, 5) cyclohexane modified PETI-5 linear oligomers and 6) PETI/4-BDAF imide oligomers, 3FDA and 6FDA backbone modified PETI-5.
Process for preparing a blend of a PETI oligomer and a phenylethynyl end-capped reactive diluent comprising
- a) physically mixing the PETI oligomer and the phenylethynyl end-capped reactive diluent,
- b) heating the mixture about the melting temperature of the reactive diluent to obtain a melt,
- c) cooling the melt, and
- d) grinding the cooled melt to a fine powder.
A process for making PETI oligomers having more than two functionalities by reacting PEPA and BPDA with a NMP solution of diamines and triamines to produce the appropriate functionality.
A process for making linear PETI oligomers modified with cyclo hexane by introducing 1,4-cyclo hexanediamine into PETI-5.
A process for making PETI oligomers containing fluorine by reacting PEPA with 3FDA.
Dependencies are inferred from the claim text.