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Matrimid ® 5218A Soluble PolyimideGeneral Matrimid® 5218 is a soluble thermoplastic polyimide. It is fully imidizedduring manufacturing, eliminating the need for high temperatureprocessing. Matrimid 5218 is soluble in a variety of common solvents.Evaporation of the solvents leaves a strong, durable, tough coating.Chemical Description Matrimid 5218 is a thermoplastic polyimide based on a proprietary diamine, 5(6)-amino-1-(4' aminophenyl)-1,3,-trimethylindaneAdvantages Fully imidizedDoes not require high temperatures for processingSoluble in a variety of common solventsExcellent adhesionDurable and tough filmsExcellent chemical resistanceVery good thermal properties 100% solid powderApplications High temperature adhesives CompositesTypical Properties Inherent viscosity 1, dl/g 0.62-0.68Volatile content 2, %<0.710.5 in NM Pat 25°C 22 gm sample heated to 260°C for 45 minutesCiba Specialty ChemicalsNorth AmericaPerformancePolymersProduct DataSpecial Features Matrimid 5218 is a soluble thermoplastic polyimide. There is nopolyamic acid precursor in the product that would require a hightemperature cure to convert to the imide form. This lack of amic acidgroups allows relatively simple processing compared to conventionalpolyamic acid precursor polyimides. For example, when solutions ofMatrimid 5218 are used for coating applications, the substrate needonly be heated to a temperature and for a time sufficient to thoroughlyremove the solvent. When the solvent has been removed, a strong,durable polymide coating remains. By contrast, the more commonpolyamic acid precursor polyimides must be heated to hightemperatures for long periods to convert the polyimide structure. This"curing" process evolves a water by-product and makes it very difficultto form pinhole-free coatings or void-free parts from those materials.No water is evolved in using Matrimid 5218 because no curing(imidization) occurs during processing.Matrimid 5218 has very unusual and desirable properties. Its highthermal stability and high glass transition temperature make Matrimid5218 suitable for adhesive applications as well as matrix resin forcomposite applications. Figure 1 shows the change in modulus versustemperature of a neat resin molding based on Matrimid 5218(Dynamic Mechanical Analysis). Table 1 illustrates the adhesiveproperties of Matrimid 5218 with a variety of substrates.Matrimid 5218 is soluble in many organic solvents and possessesexcellent chemical resistance to water, steam, brine, acids, causticand non-polar organic solvents, unlike other polyimides. As a solublethermoplastic, Matrimid 5218 retains its solubility in certain polarorganic solvents after processing, unless it has been thermally orchemically crosslinked before exposure to these solvents.Matrimid 5218 is soluble in the following solvents. In general, 20percent solutions are possible with these solvents.Methylene chlorideEthylene chlorideChloroformTetrachloroethaneTetrahydrofurane (THF)DioxaneAcetophenoneCyclohexanonem-Cresolg-ButyrolactoneDimethylformamide (DMF)Dimethylacetamide (DMAC)N-methylpyrrolidone (NMP)Table 1Adhesive PropertiesSubstrate AdhesionAluminum3, mirror finish ExcellentAluminum, Alodine treated ExcellentSteel, hot or cold rolled ExcellentStainless steel ExcellentBrass ExcellentTitanium ExcellentSpecial Features (continued)Copper, untreated Good Copper, etched with (NH4)2S2O8Excellent Glass, untreated PoorGlass, aminosilane treated Excellent Ryton® PPS (Phillips) untreated PoorRyton PPS (Phillips) acid etched Excellent Kapton® (Du Pont) untreated PoorKapton (Du Pont) acid etched Excellent3 To obtain excellent adhesion to some aluminum surfaces a surfactant, such as 3M's Fluorad® FC 430, must be added to the polyimide varnish.Mechanical Properties Matrimid 5218 FilmMachine-made film cast from a methylene chloride/Matrimid 5218solution.Final drying temperature240°C by infrared heating rollersFilm thickness 1 mil unorientedTensile strengthat break, ksi12.4at yield, ksi12.6Elongationat break, %48.6at yield, % 6.9Tensile modulus, ksi420Density, g/cc 1.2Refractive index 1.614Coefficient of linearexpansion in/in/°C 2.8 x 10-5Moisture absorption at51% R.H. (equilibrium), %0.87Matrimid 5218/ Graphite Prepreg FormulationDissolve Matrimid 5218 in g-Butyrolactone solvent (20 percent solids). Use Hercules Magnamite AS4-12K graphite fibers to prepare unidirectional prepreg.B-stage prepreg in an air circulating oven with temperature starting at 77°F, increasing to 400°F. Keep the prepreg at 400°F for 45-60 minutes. The prepreg should then have the solvent retention necessary for flow during composite fabrication.A composite panel was prepared in the following manner:Press mold:500°-600°F @ 100 psiCool down:to room temp. @ 100 psiDwell time:30 min @ 600°FPost cure:16 hrs. @ 600°F(free standing)Mechanical Properties @ 25°CFiber content, %65Short beam shear strength, psi11,000Fracture toughness G lC in-lb/in24Tg (DMA), °CDry280Wet265Thermal PropertiesTemp. (°F)Time(Wks)Weight Loss (%)Neat Resin CompositeMoulding450100.2540.120.73100.40 1.33 60010.330.6140.70 1.416 1.22 2.09Packaging and Storage Matrimid 5218 is supplied in 1, 8, and 40 pound plastic or plastic-linedcontainers. The product has a minimum shelf life of one year whenstored in unopened, sealed containers in a dry location at roomtemperature.Handling/Safety Precautions Notice. Avoid dusty conditions. Dust may be irritating.In accordance with good industrial practice, handle with care and avid unnecessary personal contact.Avoid contact with eyes and breathing of dust.Use with adequate ventilation.Wash after handling.Read Material Safety Data Sheet Before Using.For Industrial Use Only.First Aid In case of contactEyes: Flush with large quantity of water.Skin: Wash with mild soap and water.Inhalation: Remove to fresh air. Give oxygen if breathing if difficult.Ingestion: If conscious, give water. Call a physician.Important The following supercedes Buyer’s documents. SELLER MAKES NOREPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED,INCLUDING OF MERCHANTABILITY OR FITNESS FOR APARTICULAR PURPOSE. No statements herein are to be construed asinducements to infringe any relevant patent. Under no circumstancesshall Seller be liable for incidental, consequential or indirect damages foralleged negligence, breach of warranty, strict liability, tort or contractarising in connection with the product(s). Buyer’s sole remedy andSeller’s sole liability for any claims shall be Buyer’s purchase price. Dataand results are based on controlled or lab work and must be confirmedby Buyer by testing for its intended conditions of use. The product(s) hasnot been tested for, and is therefore not recommended for, uses forwhich prolonged contact with mucous membranes, abraded skin, orblood is intended; or for uses for which implantation within the humanbody is intended.Ciba Specialty Chemicals Performance Polymers 281 Fields Lane Brewster, New York 10509 (914) 785-3000(800) 222-1906Fax: (914) 785-3472Matrimid 5218Resins ©Ciba Specialty Chemicals 1997Printed in the U.S.A.September 1, 1998。