Poly /polyimide blends

Of course, this re-equilibration behavior of two homopoly(amic acids) can be eliminated if one of the components does not exhibit this back reaction. Recombination of different fragments is not possible and stable polyimide precursor blends are accessable [119]. For example, combining a relatively flexible poly(amic acid), hexafluoroisopropylidene diphthalic anhydride (6F)/2,2-bis(4-aminophenoxy-4 -phenyl) propane (BDAF), with a rigid poly(amic alkyl ester), PMDA/p-phenylene diamine (PDA), produced microphase separated polyimide blends as can be interred by the persistence of the... 

Watcharaphalakorn, S., Ruangchuay, L., Chotpattananont, D., Sirivat, A. and Schwank, J. (2005) Polyaniline/polyimide blends as gas sensors and electrical conductivity response to CO-N2 mixtures . Poly Inter., 54,1126-33. 

X. Kong, F. Teng, H. Tang, L. Dong, and Z. Feng. Miscibility and crystallization behaviour of poly(ether ether ketone)/polyimide blends. Polymer, 37(9) 1751-1755, April 1996. 

Bi H, Wang J, Chen S, Hu Z, Gao Z, Wang L, et al. Preparation and properties of cross-linked sulfonated poly(arylene ether sulfone)/sulfonated polyimide blend membranes for fuel cell application. J Membr Sci 2010 350(l-2) 109-16. 

Jones CW, Koros WJ (1994) Carbon molecular sieve gas separation membranes-I. Preparation and characterization based on polyimide precursors. Carbon 32 (8) 1419-1425 Hatori H, Kobayashi T, Hanzawa Y, Yamada Y, limura Y, Kimura T, Shiraishi M (2001) Mesoporous carbon membranes from polyimide blended with poly(ethylene glycol). J Appl Polym Sci 79 (5) 836-841... 

Sheth, K. C. R. Gallucci, R. R.and Haralur, G., Thermoplastic polyimide - poly-etheretherketone blends with exceptional high temperature properties, ANTEC 2008, Proceedings of the 66th Annual Technical Conference Exhibition, Milwaukee, WI, 4-8.05.2008, Society of Plastics Engineers, pp. 794-797. 

In addition to carbon and glass fibers ia composites, aramid and polyimide fibers are also used ia conjunction with epoxy resias. Safety requirements by the U.S. Federal Aeronautics Administration (FAA) have led to the development of flame- and heat-resistant seals and stmctural components ia civiUan aircraft cabias. Wool blend fabrics containing aramids, poly(phenylene sulfide), EDF, and other inherently flame-resistant fibers and fabrics containing only these highly heat- and flame-resistant fibers are the types most frequently used ia these appHcations. 

PBI blends (with polyimides, polyarylates, poly (4-vinyl pyridine)) Semi-interpenetrating Polyimide Network ... 

JP 05125345 (Japanese) 1993 Poly(vinyl butyral) blend adhesive composition for flexible printed circuit boards Ube Industries, Japan H Inoe, S Takabayashi, T Muramatsu, T Funakoshi Formulated resins having good flexibility and heat resistance are useful adhesives for polyimide/Cu foil laminated circuit boards Maleimide-terminated siloxane-imide block copolymers were formulated with poly(vinyl butyral) and melamine resins to give adhesive compositions. 

US 5,028,681 (American) 1991 Novel poly(imide siloxane) block copolymers and process for their preparation General Electric EN Peters Injection moldable block copolymers with high IV and excellent chemical/physical properties. Blends useful for impact modification Novel siloxane-imide block copolymers and a process for their preparation are covered. The method involves reacting a hydroxy-terminated polyimide oligomer with a siloxane oligomer with dimethylamino, acetyl or chlorine end-groups... 

Hybrid PV-distiUation processes intensification Polyimide (PI), cellophane, poly(vinyl alcohol) (PVA), cellulose diacetate (CDA), cellulose triacetate, two separate blends of cellulose acetate and CDA with cellulose acetate propionate, and PVA cross-linked with multifunctional cross-Unkers... 

Such TTT diagrams have also been useful in describing the cure of polyimide systems, as shown in Palmese (1987), which shows the TTT diagram of a polyamicacid/polyimide system. The TTT diagram of a polycyanurate system is developed by Simon (1993) on the basis of FT-IR, DSC and torsional braid measurements. Kim et al (1993) developed a TTT diagram for a thermoset-thermoplastic blend, specifically a tetrafunctional epoxy-resin/poly(ether sulfone)/dicyandiamide thermoset-thermoplastic blend (Figure 2.9). 

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