Preparation and Properties of Polyimides from Diisocyanates

Khune, G. D.

doi:10.1080/00222338008066642

Cited by 22 publications

(10 citation statements)

References 5 publications

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“…Similar results were also described by Khune [33]. More recently McGrath et al [34] reported polymerisation of BTDA and PMDA with MDI and 4,4'dicyclohexylmethane di-isocyanate in dipolar solvents.…”

Section: )-Chlsupporting

confidence: 84%

Other synthetic routes to polyimides

Takekoshi¹

1990

Polyimides

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Section: )-Chlsupporting

confidence: 84%

Other synthetic routes to polyimides

Takekoshi¹

1990

Polyimides

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“…This scenario allows for the formation of otherwise infusible polyimides, via melt processing techniques, and also permits the incorporation of chemical moieties that are susceptible to hydrolysis via the polyamic acid route. Another conversion route involves the reaction of diisocyanates with dianhydrides to form the polyimide followed by elimination of CO 2 (155)(156)(157)(158)(159)(160)(161)(162). There is not a general consensus on the mechanism of this reaction.…”

Section: Polyimides Via Polymer Conversion One Methods Has Already Beenmentioning

confidence: 99%

Polyimides

Bryant¹

2002

Encyclopedia of Polymer Science and Technology

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Polyimides are a class of high performance polymers that contain an imide group, defined as an sp 3 nitrogen bonded to two adjacent carbonyls. This imide structure is most commonly found as part of a five‐ or six‐membered ring. Polyimides are noted for their mechanical properties, chemical resistance, and dielectric strength. They exist as thermoplastics and thermosets. Polyimides are used as hot melt adhesives, matrix resins for composites, dielectric films, photoimageable coatings, flex circuits, foams, wire insulation, thin‐walled tubing, molding resins, and high performance bushings and seals. Products that compete with polyimides for niche applications include aerospace epoxies (Dow, Ciba, and Shell), cyanate resins (Dow), polysulfones (Solvay), filled polycarbonates and polyesters (Dow, Amoco, and GE), polybenzimidazoles (Hoechst‐Celanese), and some high T g filled phenolics. Although polyimides command a premium price, their versatility, reliability, and demonstrated performance make them suitable for use in high performance applications where failure and replacement costs are high.

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“…The rigid structure in the polyimide chain imparts good properties, such as thermooxidative stability, [4][5][6] but EXPERIMENTAL makes the material hard to process owing to its poor solubility. [7][8][9][10] In our previous studies, [11][12][13] we employed the diacid-terminated poly[m-pheMaterials nylene isophthalamide (PmIA)] prepolymer (NoThree kinds of commercially available dianhydrides, namely, 3,3,4,4-benzophenonetetracarboxylic dianhydride (BTDA), pyromellitic dian- thalic anhydride (DSDA), were dried under of 15%, poured into the 250-ml reaction flask, and heated at 60ЊC for 4 h. 13 The catalyst, 0.03 g/l of vacuum at 040ЊC for 4 h to remove possible moisture. The 4,4-diphenylmethane diisocyanate (MDI) triethylamine, was then added.…”

Section: Introductionmentioning

confidence: 98%

Synthesis and properties of thermostable naphthalate-containing copoly(amide-imide)s

Wang

Lin

1997

J. Appl. Polym. Sci.

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Thermostable naphthalate-containing copoly(amide-imide)s with inherent viscosity of 0.53-0.96 dL/g were synthesized by reacting diacid-terminated naphthalate monomers with various diisocyanate-terminated polyimide prepolymers. The polyimide prepolymers were prepared by using 4,4-diphenylmethane diisocyanate to react with 3,3,4,4-benzophenonetetracarboxylic dianhydride, pyromellitic dianhydride, or 3,3,4,4-sulfonyl diphthalic anhydride using a direct one-pot method to improve their solubility without sacrificing their thermal properties. The copolymers, except the B-2 and P-2 series, can be dissolved in N,N-dimethylacetamide and 5% lithium chloride or dimethyl sulfoxide at high temperature but are not soluble in pyridine. The solubility of the copolymers is related to their chemical and crystalline structures. Those copolymers with sulfonyl or amorphous structures display good solubility. All the naphthalate-containing copoly(amide-imide)s have glass transition temperatures and melting points in the range of 223-312ЊC and 348-366ЊC, respectively, and show a 10% weight-loss temperature of 485-549ЊC in air and 465-564ЊC in a nitrogen atmosphere. The tensile strength, elongation at break, and initial modulus of polymer films range from 25-74 MPa, 4-9%, and 0.74-1.60 GPa, respectively. From the X-ray diffraction studies, copolymers of B-2, P-2, and D-2 with symmetrical 2,6-naphthalate amide structure are crystalline, but the others are amorphous.

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Preparation and Properties of Polyimides from Diisocyanates

Cited by 22 publications

References 5 publications

Other synthetic routes to polyimides

Other synthetic routes to polyimides

Polyimides

Synthesis and properties of thermostable naphthalate-containing copoly(amide-imide)s

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