Free volume study on the miscibility of PEEK/PEI blend using positron annihilation and dynamic mechanical thermal analysis

[摘要] High performance polymer blend of poly(ether ether ketone) (PEEK) and poly(ether imide) (PEI) was examined for their free volume behaviour using positron annihilation lifetime spectroscopy and dynamic mechanical thermal analysis methods. The fractional free volume obtained from PALS shows a negative deviation from linear additivity rule implying good miscibility between PEEK and PEI. The dynamic modulus and loss tangent were obtained for the blends at three different frequencies 1, 10 and 100 Hz at temperatures close to and above their glass transition temperature. Applying Time-Temperature-Superposition (TTS) principle to the DMTA results, master curves were obtained at a reference temperature Toand the WLF coefficients c01and c02were evaluated. Both the methods give similar results for the dependence of fractional free volume on PEI content in this blend. The results reveal that free volume plays an important role in determining the visco-elastic properties in miscible polymer blends.

[发布机构] Polymer Science Division, DMSRDE, G.T. Road, Kanpur; 208 013, India^1

[效力级别] 化学

[关键词] Dynamic mechanical thermal analysis;Fractional free volume;Free volume behaviour;High performance polymer;Miscible polymer blends;Positron annihilation lifetime spectroscopy;Time-temperature superposition principles;Viscoelastic properties