Aromatic polyimides suitable for 3D printing processes
View Patent ↗Novel aromatic polyimides are disclosed with sufficient physical properties to be useful in 3D printing.
1. An aromatic polyimide which is a
reaction product of
(1) 3,4′-oxydianiline (3,4′ ODA);
(2) 4,4′-[1,3-phenylenebis(1-methyl-ethylidene)bisaniline (Bisaniline-M);
(3) 2,3,3′,4′-biphenyldianhydride (a-BPDA); and
(4) phthalic anhydride in a molar ratio of 0.9:0.1:0.975:0.05;
wherein the reaction product is in a shape of a filament sufficiently ductile to form a loop of about 64 cm in circumference.
2. The aromatic polyimide of claim 1 in the shape of the filament, wherein the aromatic polyimide has a glass transition temperature of more than 220° C. and ductility to be wound in the shape of the filament of about 2 mm diameter around a spool having a diameter of 8 inches (20.32 cm).
3. The aromatic polyimide of claim 2 in the shape of the filament, wherein the polyimide has a glass transition temperature ranging from about 260 to about 275° C.
4. The aromatic polyimide of claim 2 in the shape of the filament, wherein the polyimide has a glass transition temperature ranging from about 265 to about 270° C.
5. The aromatic polyimide of claim 2 in the shape of the filament, wherein the aromatic polyimide is sufficiently ductile in a length of about 38 cm to be bent upon itself, such that opposing ends of that length of filament can touch each other.
6. The aromatic polyimide of claim 5 , in the shape of the filament wherein the filament has a diameter ranging from about 1.6 to about 2.1 mm.
7. The aromatic polyimide of claim 2 in the shape of the filament, wherein the aromatic polyimide is prepared by solvent-less reactive extrusion.
8. The aromatic polyimide of claim 7 in the shape of the filament, wherein the aromatic polyimide is prepared by concurrent solvent-less reactive extrusion.
9. The aromatic polyimide of claim 1 in the shape of the filament, wherein the polyimide has a glass transition temperature ranging from about 260 to about 275° C.
10. The aromatic polyimide of claim 1 in the shape of the filament, wherein the aromatic polyimide reaction product is sufficiently ductile in a length of about 38 cm to be bent upon itself, such that opposing ends of that length of filament can touch each other.
11. A composite in the shape of the filament comprising the aromatic polyimide of claim 1 .
12. A composite in the shape of the filament comprising the aromatic polyimide of claim 2 .
13. The composite of claim 12 , wherein the composite in the shape of the filament further includes carbon, glass, or synthetic fibers.
14. The composite in the shape of the filament of claim 13 , wherein the composite is further in the form of a 3D printed article.