Structure-property relationships for partially aliphatic polyimides

S. Vijay Kumar, Hwan Chul Yu, Jiyoung Choi, Kazuaki Kudo, Yong Hoon Jang, Chan Moon Chung

    Research output: Contribution to journalArticlepeer-review

    43 Scopus citations

    Abstract

    The structure.property relationship was studied for partially aliphatic polyimides containing alicyclic dianhydride and aromatic diamine unit. Rel-[1S,5R,6R]-3-oxabicyclo[3,2,1]octane-2,4-dione-6-spiro-3′- (tetrahydrofu ran-2′,5′-dione) (DAn) was used as an unsymmetrical spiro dianhydride, and 1,2,3,4-cyclopentanetetracarboxylic dianhydride (CPDA) and bicyclo[2.2.2]oct-7-ene-2,3,5,6-tetracar boxylic dianhydride (BOCA) were used as symmetrical nonspiro dianhydrides. The dianhydrides were polymerized with two aromatic diamines, 4,4′-oxydianiline (ODA) and 4,4′-(hexafluoroisopropylidene)dianiline (FDA), using a conventional two-step chemical imidizationmethod. Structures of the PAl-PIs prepared were confirmed by 1H-NMR and FT-IR spectroscopy. Solubility of the polyimides was tested in various organic solvents. Thermal properties of the PAl-PIs were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). UV-visible spectroscopy was performed to evaluate the optical transparency of the polyimides. The effect of monomer structure on the properties was studied. The PAl-PIs prepared from DAn showed improved solubility, thermal properties, and transparency when compared with PAl-PIs derived from CPDA and BOCA. It is considered that the rigid, unsymmetrical spiro structure of DAn leads to rigidity, bulkiness, irregularity, and non-linearity of the polyimide chains, resulting in the enhanced properties of DAn polyimides. The molecular arrangement in the polyimides has also been studied by wide-angle X-ray diffraction (WAXD) and was correlated with the properties.

    Original languageBritish English
    Pages (from-to)1111-1117
    Number of pages7
    JournalJournal of Polymer Research
    Volume18
    Issue number5
    DOIs
    StatePublished - Sep 2011

    Keywords

    • Partially aliphatic polyimide
    • Structure-property relationship
    • Unsymmetrical spiro dianhydride
    • WAXD

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