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Tailoring of optical band gap and refractive index of heat treated Kapton-H Polyimide

Vijay Kumar, Parveen K. Goyal, Renu Gupta and Shyam Kumar.

The samples of Kapton-H polyimide were heated at temperatures ranging from 325 to 400 °C in air. The heat treatment induced changes in optical band gap and refractive index of Kapton-H have been studied through UV-visible spectroscopy. The reduction in optical band gap while an increase in refractive index have been observed after heat treatment. The observed optical changes have been tried to be correlated to the structural changes, revealed through FTIR spectroscopy. The present study is quite important for tailoring the optical response of Kapton-H polymer as per specific requirements.