The dichlorides of commercial 1,4‐phenylenediacrylic acid 3,3′‐(1,4‐Phenylene)di‐2‐propenoic acid. and N‐(4‐carboxyphenyl)‐trimellitimide were polycondensed with a chiral spacer prepared from (S)‐3‐bromo‐2‐methylpropanol and 4‐mercaptophenol. Optical microscopy revealed that all the resulting copoly(ester‐imide)s form an enantiotropic cholesteric melt and adopt a Grandjean texture upon slight shearing. The WAXD powder patterns indicate the formation of a layered structure in the solid state. Irradiation with UV light of wavelength ⩽ 360 nm allows crosslinking at any temperature above 25°C.
No takes yet. Share an insight, caveat, or question.
Kricheldorf et al. (1995) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: