Molecular composites of polyimide/poly-n-vinylpyrrolidone by in-situ polycondensation

The molecular composites of polyimide (PI) with poly-n-vinylpyrrolidone (PVP) were successfully synthesized by in-situ polycondensation of the rigid polymer in the matrix polymer solution. A strong acid-base interaction between the polyamic acid (the precursor of PI) and the PVP was confirmed experimentally. By this specific interaction the miscibility of PI with PVP was substantially improved. The PI dispersed in the PVP matrix polymer on a molecular level or nearly molecular level.