caa a22 4500 475763823 CHVBK 20180406123559.0 cr unu---uuuuu 170329e20000701xx s 000 0 eng 10.1007/s003960000319 doi (NATIONALLICENCE)springer-10.1007/s003960000319 Induction of a chiral nematic phase in smectic polymers [Elektronische Daten] [A. Yu. Bobrovsky, N. I. Boiko, K. Shaumburg, V. P. Shibaev] A number of new photosensitive copolyacrylates of different composition were obtained by the copolymerization of chiral photochromic benzilidene-p-menthane- 3-one acrylic monomers with a smectogenic monomer containing a hexyloxyphenylbenzoate mesogenic group. The chiral, photochromic monomers differ by the length of the aliphatic spacer and the aromatic fragment. It was found that the introduction of a small number of chiral units into the copolymers (5 mol%) leads to the "degeneration” of the smectic C phase, which characterizes the hexyloxyphenylbenzoate homopolymer, and to the formation of the smectic A phase. An unusual effect of chiral nematic phase induction was observed for copolymers containing chiral side groups with two ring aromatic fragments. It should be pointed out that the chiral nematic phase does not occur in the case of the homopolymers of both initial comonomers. An explanation of this effect, based on the consideration of the chemical structure of the chiral and hexyloxyphenylbenzoate units, was suggested. The optical properties of cholesteric copolymers were investigated; the helical twisting power of the chiral groups of different structures was calculated. The possibility of using such copolymers as new photosensitive materials was demonstrated. Springer-Verlag Berlin Heidelberg, 2000 Key words Induction of chiral nematic phase nationallicence Liquid-crystalline copolymers nationallicence Photosensitive materials nationallicence Bobrovsky A. Yu Chemistry Department Moscow State University Leninskie Gory 119899 Moscow, Russia e-mail: lcp@libro.genebee.msu.su Tel.: +7-95-9391189 Fax: +7-95-9390174, RU aut Boiko N. I. Chemistry Department Moscow State University Leninskie Gory 119899 Moscow, Russia e-mail: lcp@libro.genebee.msu.su Tel.: +7-95-9391189 Fax: +7-95-9390174, RU aut Shaumburg K. Chemistry Department Copenhagen University 2100 Copenhagen, Denmark, DK aut Shibaev V. P. Chemistry Department Moscow State University Leninskie Gory 119899 Moscow, Russia e-mail: lcp@libro.genebee.msu.su Tel.: +7-95-9391189 Fax: +7-95-9390174, RU aut https://doi.org/10.1007/s003960000319 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960000319 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bobrovsky A. Yu Chemistry Department Moscow State University Leninskie Gory 119899 Moscow, Russia e-mail: lcp@libro.genebee.msu.su Tel.: +7-95-9391189 Fax: +7-95-9390174, RU aut NATIONALLICENCE 700 1- Boiko N. I. Chemistry Department Moscow State University Leninskie Gory 119899 Moscow, Russia e-mail: lcp@libro.genebee.msu.su Tel.: +7-95-9391189 Fax: +7-95-9390174, RU aut NATIONALLICENCE 700 1- Shaumburg K. Chemistry Department Copenhagen University 2100 Copenhagen, Denmark, DK aut NATIONALLICENCE 700 1- Shibaev V. P. Chemistry Department Moscow State University Leninskie Gory 119899 Moscow, Russia e-mail: lcp@libro.genebee.msu.su Tel.: +7-95-9391189 Fax: +7-95-9390174, RU aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer