ISSN:
1022-1352
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Liquid-crystalline side-group copolymers containing cholesterol and chiral nonmesogenic chloropropionate acid groups were synthesized and investigated by means of size-exclusion chromatography, proton nuclear magnetic resonance (1H NMR), polarization microscopy, X-ray diffraction and differential scanning calorimetry. In addition the spacers of the cholesterol-containing side groups were modified by substitution of two of the methylene groups by oxygen ether groups. The cholesterol-containing homopolymer displays only an SA-mesophase. Amounts of more than 50 mol-% of the non-mesogenic chiral co-compounds led to the total disappearance of liquid-crystalline phases. For less than 50 mol-% a different phase behaviour was observed for the copolymers with unsubstituted and ether-substituted spacers. Phase transition temperatures depend also on the chirality of the non-mesogenic groups. Similar results were obtained by investigating a copolymer system, which contains chiral camphor-10-sulfonic acid moieties and which was synthesized to check this observation.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1996.021970413
