About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
Paper
Optical properties of polyalicyclic polyimides
Abstract
Fully imidized and solvent soluble polyimide films with a polyalicyclic structure were prepared from bicyclo[2.2.2]octane-2,3,5,6-tetracarboxylic2,3:5,6-dianhydrides and aromatic diamines. The optical properties such as optical transparency and refractive indices have been evaluated. These films were entirely colorless, and the normalized transparencies in the visible region were over 86%. The films remained colorless and transparent up to 300°C when heated in air, and 400°C in N2. The polyimides had an average refractive index range of 1.599 to 1.617. The birefringencies of the BAB-based polyimides were nearly zero. ©1998TAPJ.