LC Polyimides 29. Non-Crystalline Cholesteric Copoly(Ester-Imide)s Derived from Adipic Acid and Isosorbide

Abstract

Numerous cholesteric copoly(ester-imide)s were prepared from mixtures of isosorbide and tert.-buthylhydroquinone (or other diphenols), on the one hand, and mixtures of adipoylchloride and N-(4-chlorocarbonylphenyl) trimellitimide chloride on the other. When the molar ratio of isosorbide/diphenol was varied, Grandjean textures were only observed for low concentrations of isosorbide (5/95 or 10/90). In the case of adipoylchloride/imide dichloride molar ratios of 30/70–50/50 favoured the formation of Grandjean textures. Most copoly(esterimide)s were non-crystalline with glass transition temperatures ( Tgs) between 90 and 190 °C. In several cases the Grandjean textures were frozen in by cooling below Tg. Such copoly(esterimide)s may be useful as pigments. All copoly(ester-imide)s containing methylhydroquinone were semicrystalline with melting temperatures in the range of 240–270 °C.

Short-process synthetic strategies of sustainable isohexide-based polyesters towards higher molecular weight and commercial applicability

“…circularly polarized luminescence emitting materials, lacquers and pigments. 10,[54][55][56] The latter application is believed to relate to the high twisting power of chiral isohexides enabling a helical arrangement of chain segments (e.g. polyester imides) and formation of the Grandjean texture.…”

“…polyester imides) and formation of the Grandjean texture. 54,57 Thus far, isohexides have been mostly explored for polyester synthesis, given that polyesters are one of the most important polymeric materials for industrial applications (PET, the largest polyester species, has an annual production capacity exceeding 26 million tons globally nowadays 58 ). The publications of isohexide-based polyesters account for 47.7% of the total isohexide-based polymers (Fig.…”

“…10 A number of polymers with interesting optical properties have been reported, such as optically reactive polymers, nonlinear optical polymers, cholesteric polymers, etc ., which have great potential for applications like circularly polarized luminescence emitting materials, lacquers and pigments. 10,54–56 The latter application is believed to relate to the high twisting power of chiral isohexides enabling a helical arrangement of chain segments ( e.g. polyester imides) and formation of the Grandjean texture.…”