Organosoluble and transparent polyimides derived from alicyclic dianhydride and aromatic diamines

Abstract

Organosoluble polyimides were synthesized with the alicyclic dianhydride 1,8‐dimethylbicyclo[2,2,2]oct‐7‐ene‐2,3,5,6‐tetracarboxylic dianhydride and aromatic diamines. The polyimides possessed good solubility both in strong dipolar solvents and in common solvents; the thermal decomposition temperature of the polyimides exceeded 420 °C. Strong and flexible films of the polyimides, with the cutoff of ultraviolet–visible absorption lower than 310–320 nm, exhibited good features as the alignment layers for nematic liquid crystals with pretilt angles of 1.5–2.9°. © 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 40: 110–119, 2002

High solubility and optical transparency of novel polyimides containing 3,3′,5,5′-tetramethyl pendant groups and 4-tert-butyltoluene moiety

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Synthesis of novel hyperbranched polyimide for liquid crystal alignment

“…The polymers are used as LC alignment layers to induce the uniform, unidirectional alignment of LC molecules, which is critical to the optical and electrical performance of industrial LC flat-panel display devices (1)(2)(3). In this regard, a large number of PIs have been investigated for their alignment properties (2,3).…”

Nanoporous thin films of fully alicyclic polyimides

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