New Insights into the Phase Behavior of Lipopolymer Monolayers at the Air/Water Interface. IRRAS Study of a Polyoxazoline Lipopolymer

Lipopolymers are lipids with a polymer chain covalently attached to the lipid. We studied the infrared reflection absorption behavior as a function of molecular area of Langmuir monolayers of an ether lipopolymer, DC18Gly-M35 (35 monomer units). A plateau region was observed in the monolayer isother...

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Bibliographic Details
Published in:Langmuir 1997-10, Vol.13 (21), p.5521-5523
Main Authors: Baekmark, T. R, Wiesenthal, T, Kuhn, P, Bayerl, T. M, Nuyken, O, Merkel, R
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Surface properties
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Summary:Lipopolymers are lipids with a polymer chain covalently attached to the lipid. We studied the infrared reflection absorption behavior as a function of molecular area of Langmuir monolayers of an ether lipopolymer, DC18Gly-M35 (35 monomer units). A plateau region was observed in the monolayer isotherm. Within this region the CH2 asymmetric and symmetric stretching mode absorptions shifted toward lower absorption frequencies (6 and 4 cm-1, respectively). This indicates that the plateau is accompanied by strong local ordering in the lipopolymer, which contradicts previous suggestions that the plateau correlates with a mushroom−brush transition in the polymer.
ISSN:0743-7463
1520-5827
DOI:10.1021/la970610l