TY - JOUR
T1 - Self-assembly behaviours of a lipid-mimic brush polymer in thin films and at air-water interface
AU - Kim, Jonghyun
AU - Jung, Jungwoon
AU - Phan, Minh Dinh
AU - Ree, Brian J.
AU - Fujita, Shin'Ichi
AU - Kim, Heesoo
AU - Matsuoka, Hideki
AU - Shin, Kwanwoo
AU - Ree, Moonhor
N1 - Publisher Copyright:
© 2015 Elsevier Ltd.All rights reserved.
PY - 2015/11/5
Y1 - 2015/11/5
N2 - Self-assembly characteristics of poly(oxy(11-phosphorylcholineundecylthiomethyl)ethylene) (PECH-C11-PC), a lipid-mimicking brush polymer, were investigated for the first time in nanoscale thin films as well as at the air-water interface using synchrotron grazing incidence X-ray scattering, X-ray reflectivity, and infrared spectroscopy. In thin films, the PECH-C11-PC molecules were found to form a well-ordered, in-plane-oriented molecular multibilayer structure in which the bristles made partial interdigitation in the neighbored layers via the favorable interactions of the PC end groups. The brush polymer molecules were further found to favorably form molecular assemblies at the water interface. They initially formed a monolayer assembly in which the hydrophilic backbones were in the extended conformation and the zwitterionic PC ends were anchored at the water interface and the hydrophobic alkylenyl linkers were present over the water surface. This phase underwent a surface pressure-driven structural transformation path way, ultimately forming a canonical bilayer structure similar to that commonly observed among natural lipids. These remarkable self-assembly behaviors were comprehended with consideration of the hydrophilic backbone, zwitterionic PC end, hydrophobic alkylenyl linker, and their selective interactions.
AB - Self-assembly characteristics of poly(oxy(11-phosphorylcholineundecylthiomethyl)ethylene) (PECH-C11-PC), a lipid-mimicking brush polymer, were investigated for the first time in nanoscale thin films as well as at the air-water interface using synchrotron grazing incidence X-ray scattering, X-ray reflectivity, and infrared spectroscopy. In thin films, the PECH-C11-PC molecules were found to form a well-ordered, in-plane-oriented molecular multibilayer structure in which the bristles made partial interdigitation in the neighbored layers via the favorable interactions of the PC end groups. The brush polymer molecules were further found to favorably form molecular assemblies at the water interface. They initially formed a monolayer assembly in which the hydrophilic backbones were in the extended conformation and the zwitterionic PC ends were anchored at the water interface and the hydrophobic alkylenyl linkers were present over the water surface. This phase underwent a surface pressure-driven structural transformation path way, ultimately forming a canonical bilayer structure similar to that commonly observed among natural lipids. These remarkable self-assembly behaviors were comprehended with consideration of the hydrophilic backbone, zwitterionic PC end, hydrophobic alkylenyl linker, and their selective interactions.
KW - Lipid-mimic brush polymer
KW - Self-assemblies
UR - http://www.scopus.com/inward/record.url?scp=84944052290&partnerID=8YFLogxK
U2 - 10.1016/j.polymer.2015.10.003
DO - 10.1016/j.polymer.2015.10.003
M3 - Article
AN - SCOPUS:84944052290
SN - 0032-3861
VL - 78
SP - 161
EP - 172
JO - Polymer
JF - Polymer
ER -