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  • Articles  (3)
  • Physics  (2)
  • pendant silyl groups  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of aromatic polymers containing pendant silyl groups. II. Aromatic polyamides (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 1583-1588 
    Details
    ISSN: 0887-624X
    Keywords: aromatic polyamides ; pendant silyl groups ; direct polycondensation ; improved solubilities ; good thermal stability ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In order to improve the solubility of aromatic polyamides without significant loss of thermal stability, synthesis of aromatic polyamides containing pendant silyl groups was carried out by direct polycondensation of silylated aromatic diacids such as 2-trimethylsilylterephthalic acid (TSTA), 2,5-bis (trimethylsilyl) terephthalic acid (BTSTA), 5-trimethylsilylisophthalic acid (TSIA), 5-dimethylphenylsilylisophthalic acid (DMSIA), and 5-triphenylsilylisophthalic acid (TPSIA) with various aromatic diamines. The resulting polyamides had inherent viscosities in the range of 0.18-1.10 dL/g and showed improved solubilities toward aprotic polar solvents such as NMP, DMF, DMSO, etc. The prepared aromatic polyamides exhibited fairly good thermal stabilities, which were almost comparable to those of corresponding nonsubstituted aromatic polyamides. That is, thermogravimetric analysis (TGA) data revealed 10% weight losses at 358-500°C and residual weights at 700°C were 46-67% under nitrogen atmosphere. © 1992 John Wiley & Sons, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080300810
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and properties of poly(imide-sulfonate)s (1982)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 20 (1982), S. 1107-1117 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polycondensations of N,N′-bis(hydroxyalkyl)pyromellitic diimides, N,N′-bis(hydroxyphenyl)-pyromellitic diimides, N,N′-bis(hydroxyalkyl)-3,3′,4,4′-benzophenonetetracarboxylic diimides and N,N′-bis(hydroxyphenyl)-3,3′-4,4′-benzophenonetetracarboxylic diimides with aromatic disulfonyl chlorides were carried out in pyridine to produce poly(imide-sulfonate)s. The resulting polymers had inherent viscosities in the range of 0.25-0.38 dL/g. These poly(imide-sulfonate)s were insoluble in common organic solvents and had relatively good thermal stability. The TGA data showed 10% weight losses at 253-365°C and residual weights at 500°C were 22-72% in nitrogen.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1982.170200418
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  • 3
    Electronic Resource
    Electronic Resource
    Polymerization of 2-azabicyclo[2,2,1]heptan-3-one and its copolymerization with 2-pyrrolidone (1985)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 23 (1985), S. 623-634 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The anionic polymerization of a bridged bicyclic lactam, 2-azabicyclo[2,2,1]heptan-3-one (ABHO), was carried out in bulk and in solution under various reaction conditions. In general bulk polymerization of ABHO was superior to solution polymerization in conversion and degree of polymerization. The resulting polymer exhibited good thermal stability at temperatures up to 300°C. The melting point and decomposition temperature of this polyamide, poly(cyclopentane-1,3-diyliminocarbonyl), were about 307 and 335°C, respectively. Copolymerization of ABHO with 2-pyrrolidone was also made at 30°C and a varying weight percentage of ABHO with potassium pyrrolidonate as catalyst and CS2 as activator. Copolyamides that contained 15 w % of ABHO decomposed at a temperature higher than the melting point by almost 30°C. Thus the thermal stability of copolymers compared with that of nylon-4, was greatly improved. Moisture sorptions of homopolymers and copolymers were always larger than those of other polyamides (nylon 4 and 6) at any relative humidity. Tenacity and elongation at the break of melt-spun fibers obtained from copolyamides that contained 15 w % of ABHO without the drawing and annealing process were 1.25 g/den and 13.1%, respectively.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1985.170230304
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