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  • 1
    Electronic Resource
    Electronic Resource
    Thermotropic copolyamides from polyethyleneglycol bis(4-carboxyphenyl)ethers with different oxyethylene units (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 2935-2940 
    Details
    ISSN: 0887-624X
    Keywords: thermotropic copolyamides ; polyethyleneglycol bis(4-carboxyphenyl)ether ; mode of copolymerization ; p-phenylenediamines ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Copolymerizations of polyethyleneglycol bis(4-carboxyphenyl)ethers (PEGn) with different n values were found to significantly lower the anisotropic transition temperature (Tm) of the copolymers produced, and the thermotropic copolyamides of thermally more stable nematic phases were obtained. The effect was investigated in terms of PEGm/PEGn molar ratios, the number of oxyethylene units, and the even - odd character of the flexible segment. Several modes of copolymerization were carried out to investigate the effect of monomer (PEGn sequence on Tm. By these copolymerizations thermally stable copolyamides even from p-phenylenic diamines such as methyl-p-phenylenediamine and p-phenylenediamine were obtained. © 1993 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1993.080311208
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  • 2
    Electronic Resource
    Electronic Resource
    Thermotropic copolyamides from triethyleneglycol bis(4-carboxyphenyl)ether, aromatic diamines, and p-aminobenzoic acid modified by the monomer sequences in the copolyamides (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 1923-1929 
    Details
    ISSN: 0887-624X
    Keywords: thermotropic copolyamides ; p-aminobenzoic acid ; p-phenylenediamine ; monomer sequence ; triethyleneglycol bis(4-carboxyphenyl)ether ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Copolycondensations of triethyleneglycol bis(4-carboxyphenyl)ether (PEG3), p-amino-benzoic acid (PABA), and p-phenylenediamine (PPD) were studied in order to examine the effect of monomer sequences in the copolyamides upon the transition temperatures of the resulting copolymers. Random copolymerization of these monomers resulted in the copolymers exhibiting a nematic mesophase in a wide range of PABA content. On the other hand, the sequential copolymers composed of PABA/PPD = 1/1 and 2/1, which were prepared from 4,4′-diaminobenzanilide (DABA) and N,N′-bis(4-aminobenzoyl)-p-phenylenediamine (BAB-PPD), respectively, did not show a mesophase. The copolymers of a diamine combination of DABA and PPD exhibited a nematic mesophase, despite the lack of a mesophase for each homopolymer. The combinations of DABA and other diamines were also examined. © 1994 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1994.080321015
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  • 3
    Electronic Resource
    Electronic Resource
    Thermotropic liquid crystalline polyamides from polyethyleneglycol bis(4-carboxyphenyl)ethers (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 2929-2933 
    Details
    ISSN: 0887-624X
    Keywords: thermotropic polyamides ; polyethyleneglycol bis(4-carboxyphenyl)ether ; p-phenylenediamines ; 4,4′-diaminobiphenyls ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: New thermotropic liquid crystalline polyamides were prepared from polyethyleneglycol bis(4-carboxyphenyl)ether (PEGn, n = 2, 3, 4) and aromatic diamines by using triphenyl phosphite in pyridine as the condensing agent. Substituted p-phenylenediamines and 4,4′-diaminobiphenyls were successfully used; melting points and isotropization temperatures of the polyamides were changed by the kind and number of the substituents. Copolymerization of long chain aliphatic dicarboxylic acids was carried out at the lower melting point of the copolymer. Kink monomers were also incorporated into the polymer backbone. © 1993 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1993.080311207
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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