Positron annihilation studies of free volume and dielectric constant in fluorine-containing polyimidesG. HoughamQ. Zhanget al.1998American Chemical Society, Polymer Preprints, Division of Polymer Chemistry
Relative contributions of polarizability and free volume in reduction of refractive index and dielectric constant with fluorine substitution in polyimides by positron annihilation spectroscopyGareth G. HoughamY.C. Jean2013Macromolecular Chemistry and Physics