Elastic properties of polymer films: 1 -- Elastic constants of a polyimide film determined by Brillouin scattering and mechanical techniques
The authors discuss here the complete determination of the elastic properties of polymeric films using two experimental techniques. One technique employs the polymer film as a vibrating membrane and allows a direct determination of the macroscopic biaxial modulus, which serves as a figure of merit of polymer performance in applications such as packaging. Brillouin scattering, which measures the elastic properties on an [approximately] 100-[mu]m scale, allows for a complete characterization of the elastic behavior. Both techniques have been applied to polyimide films. The results obtained by the two techniques are in agreement within the reported error bars.