A Study on Formability of a Polyimide Film by Using Visco-Elasticity Measurement and Hot-Embossing Tests
This study explores the dynamic mechanical properties (e.g., storage shear modulus, loss tangent and shear viscosity) and formability of a polyimide film by visco-elasticity measurement and hot-embossing tests. The variations of storage shear modulus, tangent delta and the shear viscosity were measured as a function of the temperature for two frequencies. As a polyimide goes through its glass transition, it exhibits dramatic decreases in shear modulus and viscosity as well as the peak of tangent delta, and continues to show strong dependence on frequency and temperature. Moreover, the filling characteristics (e.g., surface appearance, replicated depth and surface roughness) of polyimide were investigated by hot-embossing tests at different temperatures using a mold with an aspect ratio of 2.5:1.
Young Won Chang, Nack J. Kim and Chong Soo Lee
S. W. Youn et al., "A Study on Formability of a Polyimide Film by Using Visco-Elasticity Measurement and Hot-Embossing Tests", Materials Science Forum, Vols. 561-565, pp. 1189-1192, 2007