Poly(phenylquinoxaline‐imide‐amide)s containing perfluoroisopropylidene units

Hamciuc, Elena; Brumă, Maria; Mercer, Frank W.; Belomoina, N. M.; Simionescu, C. I.

doi:10.1002/apmc.1995.052270103

Angew. Makromol. Chem.

1995

DOI: 10.1002/apmc.1995.052270103

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Poly(phenylquinoxaline‐imide‐amide)s containing perfluoroisopropylidene units

Elena Hamciuc¹,

Maria Brumă²,

Frank W. Mercer³

et al.

Abstract: Poly(pheny1quinoxaline-imide-amide)s have been synthesized by solution polycondensation of aromatic diamines containing preformed phenylquinoxaline units with diacid dichlorides incorporating preformed imide rings and perfluoroisopropylidene units. These polymers show high thermal stability; they decompose above 400°C and have glass transition temperatures in the 225 -290 " C range. Comparison of these compounds with related heterocyclic polymers leads to the conclusion that the decomposition of the former one… Show more

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Cited by 9 publications

References 9 publications

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Chemical stability of some poly(amide imide) type polymers

Hamciuc¹,

Hamciuc²,

Airinei³

et al. 1997

Angew. Makromol. Chem.

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The stability of some heterocyclic poly(amide imide)s in acidic and alkaline medium was compared to the structurally related polyimide and poly(amide imide)s without other heterocyclic groups. All the polymers have high stability in acidic medium. The introduction of additional heterocycles such as 1,3,4-0xadiazole or phenylquinoxaline into the macromolecular chain of a poly(amide imide) increases substantially the resistance to alkaline medium. Polyamides containing imide rings only in the side chain are more stable to hydrolysis than related polyamide having imide units in the main chain. ZUS AMMENFASSUNG:Die Saure-und Alkalibestandigkeit einiger heterozyklischer Poly(amidimid)e wurde mit der von strukturahnlichen Polyimiden und Poly(amidimid)en ohne heterozyklische Gruppen verglichen. Alle untersuchten Polymeren erwiesen sich in saurem Medium als sehr stabil. Der Einbau zusatzlicher Heterozyklen wie 1,3,4-Oxadiazol oder Phenylchinoxalin in die Polymerkette eines Poly(amidimid)s fiihrte zu einer erheblichen Verbesserung der Alkalistabilitat. Polyamide mit Imid-Ringen in der Seitenkette sind bestandiger gegen Hydrolyse als Polyamide mit Imid-Gruppen in der Hauptkette.

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Chemical stability of some poly(amide imide) type polymers

Hamciuc¹,

Hamciuc²,

Airinei³

et al. 1997

Angew. Makromol. Chem.

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show abstract

Compared properties of aromatic polyamides containing silicon in the main chain

Sava¹,

Szesztay²,

Brumă³

et al. 1997

Angew. Makromol. Chem.

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Two series of aromatic polyamides incorporating silicon together with phenylquinoxaline or with hexafluoroisopropylidene groups have been synthesized and their properties have been characterized and compared with those of related polymers. These polymers are easily soluble in polar amidic solvents such as N-methyl-2-pyrrolidinone and dimethylformamide, and in tetrahydrofuran, and can be cast into thin, transparent films from solution. The polyamides have weight-and number-average molecular weights in the range of 10000-40000 and 3000-6000, respectively, and polydispersities in the range of 3-10. They show glass transition temperatures in the range of 236 "C-275 "C and decomposition temperatures above 400°C. The polymer films have low dielectric constants in the range of 3.26-3.68, and good mechanical properties (tensile strength 74-100 MPa, tensile modulus 180-386 MPa), thus being comparable with other high performance dielectrics. ZUSAMMENFASSUNG:Zwei Reihen aromatischer Polyamide mit Silicium und Phenylchinoxalin-oder Hexafluorisopropyliden-Gruppen wurden hergestellt und ihre Eigenschaften mit denen venvandter Polymerer verglichen. Die Polymeren sind leicht loslich in polaren amidischen Losungsmitteln wie N-Methyl-2-pyrrolidinon und Dimethylformamid sowie in Tetrahydrofuran. Aus diesen Losungen konnen diinne, transparente Filme gegossen werden. Die gewichts-und zahlenmittleren Molekulargewichte der Polyamide liegen im Bereich 10000-40000 bzw. 3 000-6 000, die Uneinheitlichkeiten im Bereich 3-10. Die Glasiibergangstemperaturen liegen zwischen 236 "C und 275 "C, die Zersetzungstemperaturen oberhalb von 400 "C. Die Dielektrizitatskonstanten der Polymerfilme sind niedrig (3.26-3.68), die mechanischen Eigenschaften gut (Zugfestigkeit 74-100 MPa, Zugmodul 180-386 MPa) und mit denen anderer ,,high performance"-Dielektrika vergleichbar.

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Heterocyclic polyamides containing hexafluoroisopropylidene groups

Brumă¹,

Hamciuc²,

Hamciuc³

et al. 1997

Macromolecular Symposia

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New heterocyclic polyamides have been synthesized by solution polycondensation of aromatic diamines containing phenylquinoxaline units with diacid chlorides having both imide and hexafluoroisopropylidene (6F) groups. These polymers are soluble in polar aprotic solvents, such as N‐methylpyrrolidone (NMP) or N, N‐dimethylformamide (DMF), and can be cast into flexible thin films from solutions. They show high thermooxidative stability with decomposition temperatures above 400°C and glass transition temperatures in the range of 225‐300°C. The polymer films exhibit good chemical resistance towards diluted acids and good electrical insulating properties with dielectric constants in the range of 3.2–3.7.

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Poly(phenylquinoxaline‐imide‐amide)s containing perfluoroisopropylidene units

Cited by 9 publications

References 9 publications

Chemical stability of some poly(amide imide) type polymers

Chemical stability of some poly(amide imide) type polymers

Compared properties of aromatic polyamides containing silicon in the main chain

Heterocyclic polyamides containing hexafluoroisopropylidene groups

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