J.H. Stathis, R. Bolam, et al.
INFOS 2005
A cholesterol-functionalized aliphatic cyclic carbonate monomer, 2-(5-methyl-2-oxo-1,3-dioxane-5-carboxyloyloxy)ethyl carbamate (MTC-Chol), was synthesized. The organocatalytic ring-opening polymerization of MTC-Chol was accomplished by using N-(3,5-trifluoromethyl)phenyl-N′-cyclohexylthiourea (TU) in combinations with bases such as 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and (-)-sparteine, and kinetics of polymerization was monitored. By using mPEG-OH as the macroinitiator, well-defined amphiphilic diblock copolymers mPEG113-b-P(MTC-Chol)n (n = 4 and 11) were synthesized. Under aqueous conditions, these block copolymers self-assembled to form unique nanostructures. Disk-like micelles and stacked-disk morphology were observed for mPEG113-b-P(MTC-Chol)4 and mPEG113-b-P(MTC- Chol)11, respectively, by transmission electron microscopy (TEM). Small-angle neutron scattering supports the disk-like morphology and estimates the block copolymer micelle aggregation number in the dispersed solution. The hydrophobic nature of the cholesterol-containing block provides a versatile self-assembly handle to form complex nanostructures using biodegradable and biocompatible polymers for applications in drug delivery. © 2013 American Chemical Society.
J.H. Stathis, R. Bolam, et al.
INFOS 2005
Arvind Kumar, Jeffrey J. Welser, et al.
MRS Spring 2000
E. Burstein
Ferroelectrics
Douglass S. Kalika, David W. Giles, et al.
Journal of Rheology