We developed new photo alignment materials based on chalconyl structure with high sensitivity to near UV light. Poly(4-methacryloyloxy chalcone), PM4Ch, and its derivatives exhibited good LC alignment upon near TJV exposure. The photoreactivity of chalconyl structure was high because due to longer wavelength of UV absorption. The high sensitivity of PM4Ch, compared with Poly(4'-methacryloyloxy chalcone), PMCh, could be explained by the suppression of isomerization and/or by the alignment capability of the side chain structure.

No abstract

Copolyamides based on poly(m‐phenylene isophthalamide) and poly‐(p‐phenylene terephthalamide), to which 1,6‐diaminohexane units were regularly inserted every 3 or 5 phenylene monomer units, were synthesized. The copolymers were obtained by condensation of individually prepared diamino‐ and dicarboxylic‐building blocks via the Yamazaki–;Higashi reaction. Solubility of the copolyamides are discussed in relation with the structure. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 2379–2386, 1997

One order of magnitude enhancement of the liquid crystal anchoring strength can be realized on photo-aligned copolymer films containing ω-(4-chalconyloxy)alkyl side groups, when the photo-dimerization of chalconyl units by linearly polarized near ultraviolet light is carried out at a temperature above the glass transition of the start polymer. Under the optimal condition, the polar anchoring strength was found to become comparable with that of rubbed polyimide alignment films, thereby allowing a stable electro-optical performance. Based on the behavior of the photo-induced optical anisotropy, we argue that the enhanced anchoring results from a cooperative relaxation of polymer main chains that assists further photo-crosslinking of chalconyl units via a “zipper-closing” mechanism.

We note that cclo = U,, and we have one of the functionals first given by Wright and Scadron (1964) and A detailed study of the properties of these sequences and their applications to quantum scattering theory is in progress and will be reported in due course.is the other functional given by these authors. Abstract. Arguments are presented leading to the rejection of the result ofWarke and Gunye that the energies of eigenstates of angular momentum J', projected from a Hartree-Fock state which is an eigenstate of J,, are monotonic in J .