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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

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Spelling suggestions: "subject:"polyelectrolytesurfactant complex"" "subject:"polyelectrolytebivalent complex""

1

Ionene and ionene alkyl sulfate stoichiometric complexes / Temperature and humidity sensitive materials / Ionene und Stöchiometrische Ionene-Alkylsulfat-Komplexe

Yu, Quanwei 03 October 2004 (has links) (PDF)
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.
Hexagonale Struktur
Intelligente Materialen
Isotrop-anisotroper Übergang
Polyelektrolyt-Tensid-Komplex
Hexagonal structure
Isotropic-anisotropic transition
Polyelectrolyte-surfactant complex
Smart materials
ddc:540
rvk:VE 6307
Hexagonaler Kristall
Intelligenter Werkstoff
Komplexe
Polyelektrolyt
Symplexe
Tensid
2

Ionene and ionene alkyl sulfate stoichiometric complexes: Temperature and humidity sensitive materials

Yu, Quanwei 28 October 2004 (has links)
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.
info:eu-repo/classification/ddc/540
ddc:540

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