“…Polyimide has a variety of outstanding properties, including a high glass transition temperature, excellent thermal stability, low dielectric constant, good mechanical properties, low moisture absorption, chemical stability and solvent resistance [ 40 , 120 ], all of which determine that it can be used in many fields, such as in flexible substrate materials [ 64 , 121 , 122 , 123 ], flexible device structure materials [ 59 , 124 , 125 , 126 ], flexible packaging materials [ 127 , 128 ], etc.…”