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Synthesis and properties of polyamide–imides containing fluorenyl cardo structure

Authors

  • Zhiqiang Hu,

    1. The Key Laboratory of Molecular Engineering of Polymer, Ministry of Education, Department of Macromolecular Science, Fudan University, Shanghai 200433, China
    2. Shanghai Research Institute of Synthetic Resins, Shanghai 200235, China
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  • Shanjun Li,

    Corresponding author
    1. The Key Laboratory of Molecular Engineering of Polymer, Ministry of Education, Department of Macromolecular Science, Fudan University, Shanghai 200433, China
    2. Shanghai Research Institute of Synthetic Resins, Shanghai 200235, China
    • The Key Laboratory of Molecular Engineering of Polymer, Ministry of Education, Department of Macromolecular Science, Fudan University, Shanghai 200433, China
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  • Chunhua Zhang

    1. Shanghai Research Institute of Synthetic Resins, Shanghai 200235, China
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Abstract

A series of alternating polyamide–imides (PAIs) with fluorenyl cardo having inherent viscosities of 0.38–0.88 dL/g was synthesized by one-pot polycondensation of cardo diamines, trimellitic anhydride, and various aromatic diamines including p-phenylene diamine, m-phenylene diamine, 4,4'-oxydianiline, 3,4'-oxydianiline, 2,2-bis[4-(4-aminophenoxy)phenyl]propane, 2,2-bis[4-(3-amino phenoxy)phenyl]propane using triphenyl phosphite as condensing agents. Most of the polymers were readily soluble in a variety of organic solvents, such as N-methyl-2-pyrrolidin-one, N,N-dimethylacetamide (DMAc), N,N-dimethylformamide, dimethyl sulfoxide, pyridine, and tetrahydrofuran, etc. PAIs exhibited better solubility when alkyl substituents were incorporated. Moreover, the effects of the linkage of imide/amide on the properties of PAIs were also discussed. The glass-transition temperatures of these polymers were recorded between 235 and 448°C by DSC and 10% weight loss temperature of all polymers exceed 450°C in air. The films of the resulting PAIs could be cast from their DMAc solutions. These films had a tensile strength in the range of 43-111 MPa, and an elongation at break in the range of 1.5–7.1%. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007

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