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Different molecular weight samples of a polyimide, 6FDA-PFMB, were synthesized from 2,2 -bis (3,4-dicarboxyphenyl) hexafluoropropane (6FDA) and 2,2 -bis(trifluoromethyl)-4,4 -diaminobiphenyl (PFMB) in refluxing m-cresol at high temperatures through a one-step polymerization route. Films of 6FDA-PFMB ranging from 1 to 100 μm thickness were prepared via solution-casting and investigated using optical...
Novel and reproducible uniaxial negative birefringent compensators for twisted nematic liquid crystal displays which are operated in the normally white mode have been developed for improving viewing angle characteristics and contrast ratio. The compensator design is based on the in-plane orientation of solution-cast aromatic semi-rigid polyimide films which possess a high degree of transmission and...
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