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Synthesis, characterization and properties of polyimides from 3,3′,4,4′-benzophenonetetracarboxylic dianhydride and imidazole-blocked 2,5-bis[(n-alkyloxy)methyl]-1,4-benzenediisocyanates

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Summary

By the solution condensation of 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA) with imidazole-blocked 2,5-bis[(n-alkyloxy)methyl]-1,4-benzenediisocyanates (Cm-BDIs) a series of aromatic polyimides (Cm-BP-PIs) having flexible (n-alkyoxy)methyl (-CH2O-n-CmH2m+1, m=4, 6, 8) side chains were prepared and characterized by IR- and 1H-NMR spectroscopy and their properties were measured and discussed in respect to the effects of side chains. Inherent viscosities of the polymers were in the 0.23–0.34 dL/g range. All the polymers were highly soluble in N,N′-dimethylpropyleneura(DMPU) and C6- and C8-BP-PIs even in CHCl3 at room temperature. UV-VIS spectra showed that the π-electrons are delocalized along the main chain. TGA studies showed a two-step pyrolysis behavior and in DSC Tg's of C4-, C6- and C8-BP-PIs were determined to be 184, 135 and 127 °C, respectively. Wide-angle X-ray diffractometry for as-polymerized samples revealed a quite low crystallinity with only loosely developed layered structure.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, 790-784, Pohang, Korea

    Jin Chul Jung & Sang-Bong Park

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  1. Jin Chul Jung
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  2. Sang-Bong Park
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Jung, J.C., Park, SB. Synthesis, characterization and properties of polyimides from 3,3′,4,4′-benzophenonetetracarboxylic dianhydride and imidazole-blocked 2,5-bis[(n-alkyloxy)methyl]-1,4-benzenediisocyanates. Polymer Bulletin 35, 423–430 (1995). https://doi.org/10.1007/BF00297607

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  • DOI: https://doi.org/10.1007/BF00297607

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