Particularity of relaxation of mechanical properties of the kapton h type polyimide films at different strain rates after long-term exposure to environmental conditions

Key Points

• This research aims to understand how strain rates affect the mechanical properties of Kapton H polyimide films after long-term environmental exposure.
• Examined polyimide films of varying thicknesses under tensile conditions at room temperature.
• Analyzed the mechanical properties in their initial state and after several years of exposure to normal conditions.
• Measured elastic and forced elasticity moduli along with deformation characteristics.
• Exposure alters elastic and forced elasticity moduli at all strain rates.
• Strain rate sensitivity of deformation components changes direction post-exposure.
• Notable changes in fracture characteristics of the exposed films were observed.

Abstract