Ionene and ionene alkyl sulfate stoichiometric complexes

Stoichiometric polyelectrolyte-surfactant complexes represent a type of comb-shaped polymers, in which every polymer chain unit has an electrostatically bound "side chain". These complexes are water-insoluble. In the solid state they assemble spontaneously into mesogenic structures. The [X,Y]-ionenes ([(CH2)XN+(CH3)2(CH2)YN+(CH3)2]nBr-2n) investigated formed stoichiometric complexes with alkyl sulfates. The ionene alkyl sulfate complexes display mesogenicity, i.e. optically isotropic dry complexes underwent lyotropic and thermotropic phase transitions to the optically anisotropic phase (and vice versa) under controlled relative humidity. The optically anisotropic phases exhibited hexagonal textures as revealed by polarizing microscopy. A new feature is the lyotropic transition brought about by the uptake of water through the gas phase. The complexes were all sensitive to both humidity and temperature. In principle, the effects can be applied to measure humidity.

Level thesis:degree_level

thesis.doctoral

Grantor dc:publisher

Technische Universität Dresden

Year

2004

Author dc:creator

• Yu, Quanwei

Contributors dc:contributor

• Wolff, Thomas
• Arndt, Karl-Friedrich
• Goedel, Werner A.

• Hexagonale Struktur
• Intelligente Materialen
• Isotrop-anisotroper Übergang
• Polyelektrolyt-Tensid-Komplex
• Hexagonal structure
• Isotropic-anisotropic transition
• Polyelectrolyte-surfactant complex
• Smart materials