NOVEL PI/ORGANOCLAY NANOCOMPOSITES OBTAINED FROM 2,5-BIS-(AMINOPYRIDINE-2-YL)-1,3,4-OXADIAZOLE (BAPO)
Published: 11 Jul 2016
Abstract: Cation exchange reaction between the hydrochloride salt of 2,5-bis-(aminopyridine-2-yl)-1,3,4-oxadiazole (BAPO) and sodium montmorillonite (Na+-Mt) gave an organophilic clay (BAPO-Mt). The intercalation of BAPO within the clay galleries is confirmed by wide-angle X-ray diffraction (XRD). A series of organoclay/polyimide nanocomposites (CPN) consisting of BAPO and benzophenone-3,3',4,4'-tetracarboxylic dianhydride (BTDA) were also obtained by an in situ polymerization reaction followed by thermal imidization. Structural properties and thermal stability of the obtained CPNs were studied by XRD, TGA, differential scanning calorimetry (DSC), and differential thermal analysis (DTA). XRD patterns showed that CPNs 1-3wt.% may have exfoliated structure while in the CPN 5wt.% intercalated structure is significant. The glass transition temperature (Tg) is increased with respect to pristine PI for CPNs 1-3wt.%. Based on the obtained results, CPN 1wt.% showed the most improved thermal properties. Single electron microscopy (SEM) showed that the film obtained from CPN 1wt.% has smoother surface than that of pristine PI.
Keywords: nanocomposite, clay modification, montmorillonite, polyimide, layered silicate
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