%0 Journal Article
%T Effect of charge transfer and chain stacking on the optical and thermal properties of polyimides derived from sulfone and amide
%A Jizhen Huo
%A Yingfeng Yu
%J High Performance Polymers
%@ 1361-6412
%D 2019
%R 10.1177/0954008318775793
%X To study the effect of charge transfer and chain stacking on the optical and thermal properties, a group of polyimides (PIs) were prepared from various diamines and dianhydrides containing sulfone, amide, and/or trifluoromethyl groups. Ultraviolet¨Cvisible spectroscopy, thermomechanical analysis, and thermogravimetric analysis were employed to study the properties of PIs. PIs containing sulfone and amide groups exhibited transmittance varying from 2.9% to 44.9% at 400 nm with good thermal stabilities of 5% weight loss in nitrogen at 455¨C466ˇăC. The coefficient of thermal expansion values were 37.7¨C49.8 ppm/ˇăC and glass transition temperatures were 261¨C299ˇăC. The improved optical properties are owing to incorporation of amide group that decreases the electron-acceptability and sulfone group that distorts the chains, inhibiting the dense chain stacking. There is a trade-off relationship between the optical property and thermal property
%K Polyimide
%K sulfone
%K amide
%K charge transfer
%K chain stacking
%U https://journals.sagepub.com/doi/full/10.1177/0954008318775793