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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and properties of polyterephthalamides with ester pendent groups (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 1703-1711 
    Details
    ISSN: 0887-624X
    Keywords: polyamides ; synthesis ; modification ; ester pendent groups ; solubility ; thermal stability ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 3,5-Dinitrobenzoyl chloride reacted with various alcohols such as phenol, biphenyl-4-ol, 1-naphthol, or diphenylmethanol to afford the 3,5-dinitrobenzoic acid ester derivatives which were catalytically hydrogenated to the corresponding diamines. The latter reacted with terephthaloyl dichloride to yield a new series of modified polyterephthalamides bearing pendent groups connected to the polymer backbone with ester linkages. The analogous unsubstituted polyterephthalamide were also prepared to compare the properties of the two series of aromatic polyamides. The polyamides were characterized by FT-IR, 1H-NMR, inherent viscosity, and water-absorption measurements, x-ray, DTA, TMA, TGA, and isothermal gravimetric analysis. The modified polyamides exhibited better solubility in certain organic solvents and higher hydrophilicity than the corresponding unmodified one. They were amorphous and softened at about 230°C. The glass transition temperatures ranged from 178 to 217°C. After an appropriate thermal treatment, crosslinking of modified polyamides was achieved and their thermal stability was slightly lower than that of parent unsubstituted polyamide. They were stable up to 354-370°C in N2 or air and afforded anaerobic char yields of 50-60% at 800°C. © 1996 John Wiley & Sons, Inc.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Crosslinkable aromatic polyimides containing 2,3-dicyanopyrazine rings (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 1303-1311 
    Details
    ISSN: 0887-624X
    Keywords: polyimides ; cyano-substituted polymers ; synthesis ; crosslinking ; thermal stability ; 2,3-dicyanopyrazine ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: New crosslinkable aromatic polyimides were synthesized from 2,3-dicyano-5,6-di(aminophenyl)pyrazine (1b) and 2,3-dicyanopyrazino [5,6-9,10] diaminophenanthrene (2b). They were characterized by viscosimetry, IR, NMR, x-ray, DTA, TMA, TGA, and isothermal gravimetric analysis. The polyimides derived from 1b were amorphous whereas those prepared from 2b showed microcrystalline or crystalline character. The polymers were soluble in polar aprotic solvents (DMF, NMP, DMSO) at ambient temperature or upon heating. They dissolved also completely or partially in certain hot inorganic and organic acids (H2SO4, CCl3COOH). Their glass transition temperatures were in the range of 257-370°C. The crosslinked polymers obtained after an appropriate thermal treatment, were stable up to 397-426°C in N2 or air and afforded anaerobic char yields of 62-75% at 800°C. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 1303-1311, 1997
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    Unsaturated polyamides and polyesters prepared from 1,4-bis(2-carboxyvinyl)benzene and 4-hydroxycinnamic acid (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 2799-2807 
    Details
    ISSN: 0887-624X
    Keywords: unsaturated polyamides and polyesters ; synthesis ; crosslinking ; thermal stability ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Various unsaturated polyamides and polyesters were prepared from the reactions of 1,4-bis(2-carboxyvinyl)benzene acid chloride with aromatic diamines and bisphenols, respectively. In addition, various unsaturated homo- and copolyesters were synthesized from 4-hydroxycinnamic acid and 4-hydroxybenzoic acid. They were heat-cured to thermally stable resins. The polymers were characterized by inherent viscosity measurements, FT-IR, x-ray, DTA, TMA, TGA, and isothermal gravimetric analysis. The water absorption as well as the solubility behavior of the polymers was also investigated. © 1996 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 4
    Electronic Resource
    Electronic Resource
    Modified polyisophthalamides bearing pendent benzoylamino and/or (phenylamino)carbonyl groups (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 1685-1691 
    Details
    ISSN: 0887-624X
    Keywords: polyamides ; synthesis ; modification ; amide pendent groups ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of modified polyisophthalamides were prepared from 5-(phenylamino)carbonyl-1,3-phenylenediamine and 5-benzoylamino-isophthalic acid. The polymers were characterized by FT-IR, 1H-NMR, inherent viscosity, water absorption measurements, x-ray, DTA, TGA, and isothermal gravimetric analysis. The modified polyamides were amorphous and softened at 210-245°C. They showed higher hydrophilicity and better solubility in certain solvents such as DMF, DMSO, CCl3COOH, cyclohexanone, and m-cresol than the corresponding unmodified polyamide. They started to lose weight at 329-344°C in N2 or air, whereas the degradation of unmodified polyamide started at 320°C in N2 and 308°C in air. © 1996 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 5
    Electronic Resource
    Electronic Resource
    Soluble and fusible polyamides and polyimides containing pyrazoline moieties and their crosslinking to heat-resistant resins (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 1353-1361 
    Details
    ISSN: 0887-624X
    Keywords: polyamides ; polyimides ; pyrazoline ; synthesis ; crosslinking ; solubility ; thermal stability ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 3-(4-Aminophenyl)-5-(3-aminophenyl)-2-pyrazoline as well as the 1-acetyl- or 1-benzoyl-substituted derivatives of this compound were synthesized and used for preparing a new series of polyamides and polyimides. Characterization of polymers was accomplished by inherent viscosity, 1H-NMR, 13C-NMR, x-ray, DTA, TMA, TGA, and isothermal gravimetric analysis. The properties of polymers were correlated with their chemical structures. They were amorphous or microcrystalline and soluble in polar aprotic solvents, CCl3COOH, and m-cresol. The polyamides showed an excellent solubility being soluble even in o-dichlorobenzene, 1,2-dichloroethane, and chloroform. The polymers displayed Tg at 127-163°C and softening at 150-195°C. The polyamide bearing unsubstituted pyrazoline moieties was remarkably more hydrophilic than those containing 1-acetyl- or 1-benzoyl-substituted pyrazoline segments. Upon curing, crosslinked polymers were obtained and their thermal stability was evaluated. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 1353-1361, 1997
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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