초록 ▼

A polyimide prepolymer blend including a first prepolymer component comprising a first polyimide oligomer having the formula E1-R1n-E1 and a second prepolymer component selected from M1, a second polyimide oligomer having the formula E2-R2n-E2, and combinations thereof; where R1 and R2 independently

A polyimide prepolymer blend including a first prepolymer component comprising a first polyimide oligomer having the formula E1-R1n-E1 and a second prepolymer component selected from M1, a second polyimide oligomer having the formula E2-R2n-E2, and combinations thereof; where R1 and R2 independently comprise: where n is from about 1 to about 5, V is a tetravalent substituted or unsubstituted aromatic monocyclic or polycyclic linking structure, R is a substituted or unsubstituted divalent organic radical. E1 and E2 independently comprise crosslinkable functional groups. M1 comprises a mixture of monomeric compounds including a diamine component, a dianhydride component, and an end group component. The prepolymer blend, prior to cure, provides at least one predetermined prepolymer blend property; and when cured under suitable cure conditions, the prepolymer blend provides a crosslinked polyimide matrix having at least one predetermined crosslinked matrix property.

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1. A prepolymer blend comprising: a first cross-linkable prepolymer component comprising at least a first polyimide oligomer having the formula: E1-[R1]n-E1; anda second cross-linkable prepolymer component comprising M1, wherein M1 is capable of forming a second polyimide oligomer different than the

1. A prepolymer blend comprising: a first cross-linkable prepolymer component comprising at least a first polyimide oligomer having the formula: E1-[R1]n-E1; anda second cross-linkable prepolymer component comprising M1, wherein M1 is capable of forming a second polyimide oligomer different than the first polyimide oligomer having the formula E2-[R2]n-E2;wherein R1 and R2 independently comprise the following structure: wherein n comprises from about 1 to about 5, wherein V is a tetravalent aromatic monocyclic or polycyclic linking structure, R is a divalent organic radical, E1 and E2 independently comprise crosslinkable functional groups, and wherein M1 comprises a mixture of unreacted monomeric compounds including a diamine component, a dianhydride component, and an end group component, the diamine component comprising at least two diamine compounds, the dianhydride component comprising at least two dianhydride compounds, and the end group component comprising at least one end group compound;wherein the prepolymer blend, prior to cure, provides at least one predetermined prepolymer blend property; andwherein the prepolymer blend, when cured under suitable cure conditions, provides a crosslinked polyimide matrix having at least one predetermined crosslinked matrix property. 2. The prepolymer blend according to claim 1 wherein the at least one predetermined prepolymer blend property is selected from the group consisting of a melt viscosity of the prepolymer blend, a molecular weight of the prepolymer blend, a maximum cure temperature of the prepolymer blend, tack of the prepolymer blend, drape of the prepolymer blend, processability of the prepolymer blend using resin film infusion (RFI), and processability of the prepolymer blend using resin transfer molding (RTM). 3. The prepolymer blend according to claim 2 wherein the predetermined prepolymer blend property is the melt viscosity being within a range of from about 800 cps to less than about 100,000 cps. 4. The prepolymer blend according to claim 2 wherein the predetermined prepolymer blend property is the melt viscosity being within a range of from about 800 cps to about 40,000 cps. 5. The prepolymer blend according to claim 1 wherein the at least one predetermined crosslinked matrix property is selected from the group consisting of a thermal oxidative stability of the crosslinked polyimide matrix, a glass transition temperature of the crosslinked polyimide matrix, a molecular weight of the crosslinked polyimide matrix, a void content of the crosslinked polyimide matrix, tensile strength of the crosslinked polyimide matrix, compression strength of the polyimide matrix, and inplane shear of the polyimide matrix. 6. The prepolymer blend according to claim 5 wherein the predetermined crosslinked matrix property is the glass transition temperature being at least about 450° F. (232° C.). 7. The prepolymer blend according to claim 5 wherein the predetermined crosslinked matrix property is the glass transition temperature being at least about 550° F. (288° C.). 8. The prepolymer blend according to claim 1 wherein the diamine component provides at least about 40 mol % of the second prepolymer component. 9. The prepolymer blend according to claim 1 wherein the dianhydride component provides not more than about 30 mol % of the second prepolymer component. 10. The prepolymer blend according to claim 1 wherein the end group component provides not more than 30 mol % of the second prepolymer component. 11. The prepolymer blend according to claim 1 wherein M1 consists essentially of at least about 40 mol % of the diamine component, not more than about 30 mol % of the dianhydride component, and not more than about 30 mol % of the end group component. 12. The prepolymer blend according to claim 1 wherein in the second prepolymer component the diamine component includes 4,4′-(1,3-phenylene-bis(1-methylethylidene))bisaniline (bisaniline-M) and 1,4-phenylenediamine (para-PDA), or derivatives thereof; the dianhydride component includes 3,4,3′,4′-benzophenonetetracarboxylic dianhydride (BTDA) and 3,4,3′,4′-biphenyltetracarboxylic dianhydride (BPDA), or derivatives thereof and the end group component is at least one member of the group consisting of monomethyl ester of 5-norbornene 2,3-dicarboxylic acid (NE) and derivatives thereof. 13. The prepolymer blend according to claim 1 wherein the first and second prepolymer components are present in predetermined relative amounts dependent upon the predetermined prepolymer blend property, the predetermined crosslinked matrix property, or a combination thereof. 14. The prepolymer blend according to claim 1 wherein the first prepolymer component is a solid and the second prepolymer component is a liquid, and wherein the first prepolymer component comprises from about 20 wt % to about 30 wt % of the prepolymer blend. 15. The prepolymer blend according to claim 1 wherein the first prepolymer component has a molecular weight of from about 700 g/mol to about 2500 g/mol. 16. A crosslinked polymer matrix formed after cure under suitable cure conditions, of the prepolymer blend according to claim 1 and having a glass transition temperature of at least about 450° F. (232° C.).