Thermal behaviour of polymeric Langmuir-Blodgett multilayers

Abstract

Langmuir-Blodgett multilayers of hydrocarbon and fluorocarbon polymers with hydrophilic spacer, lipid-polyelectrolyte complexes and mesogenic polymers have been prepared. The thermal behaviour of the multilayers was studied by small angle X-ray scattering, IR and UV-visible spectroscopy. Good thermal stabilities were found for the various classes of polymers. In addition, for both complexed multilayers and mesogenic polymer films, reorientation processes were observed.

Mixed polymeric monolayers and Langmuir-Blodgett multilayers with functional low molecular weight guest compounds

“…The statistical liquid-crystalline biphenyl copolymer 1 [3,12] was synthesized in analogy to refs. I and 4.…”

“…The search for stable and functional LB multilayers resulted in the use of functionalized preformed polymers [1][2][3][4][5]. However, polymers with chemically sensitive functional groups, e.g.…”

“…The principle is well known for mixed monolayers and LB multilayers of ionic lipids which are stabilized by complexation with oppositely charged polyelectrol ytes [3,5]. First attempts to codeposit functional guest molecules within a non ionic polymer matrix like poly(methyl methacrylate) [8], poly( octadecyl methacrylate) [9] or polyglutamate copolymer s [10] have also been reported.…”

“…Recently spacer polymers with good self-organization properties have been introduced combining amphiphilic and mesogenic elements [2][3][4]II]. These so called amphotropic polymers [3][4][5] form thermally stable LB films which exhibit a reversible ph ase transition to a less ordered " liquid-crystalline" state on heating [4].…”

“…These so called amphotropic polymers [3][4][5] form thermally stable LB films which exhibit a reversible ph ase transition to a less ordered " liquid-crystalline" state on heating [4].…”