Abstract
Polymer-tethered membranes combine fascinating structural, dynamic, and viscoelastic properties. Many important insights into these peculiar supramolecular systems can be obtained from studies on polymer-tethered monolayers. This chapter discusses recent experimental findings on polymer-tethered monolayers at the air–water interface. In particular, Langmuir monolayers which are comprised of pure lipopolymers and of binary phospholipid–lipopolymer mixtures are considered. Thermodynamic data as well as structural data based on a host of experimental techniques including X-ray and neutron reflectrometry, infrared reflection absorption spectroscopy, and sum frequency generation spectroscopy provide information on how lipopolymers organize at the air–water interface. This information is followed by a review of the viscoelastic properties of these systems, including the remarkable gelation transition that can be observed in lipopolymers and mixed phospholipid–lipopolymer monolayers. The diffusion properties are also discussed at length, and show that lipid diffusivity is critically dependent on the strength of inter-polymer interactions of lipopolymers.
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Notes
- 1.
Interestingly enough, the storage modulus of diblock copolymers is weakened by increasing the mol fraction of one of the substituents of the diblock, unfunctionalized PEG chains [47]. This is similar to the current situation if a DSPE-PEG2000 lipopolymer is considered a short diblock copolymer and the mixed-in phospholipid is considered one of the substituents of the diblock.
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Acknowledgement
This work was supported by grants from the Petroleum Research Fund and the National Science Foundation.
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Siegel, A.P., Naumann, C.A. (2009). Polymer Stabilized Lipid Membranes: Langmuir Monolayers. In: Meier, W., Knoll, W. (eds) Polymer Membranes/Biomembranes. Advances in Polymer Science, vol 224. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-10479-4_11
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