Thermo-Responsive Films Based Upon Diels-Alder Chemistry and Block Copolymer Phase Separation

Report No. ARL-TR-4127
Authors: Philip J. Costanzo; Frederick L. Beyer; J. Derek Demaree
Date/Pages: June 2007; 26 pages
Abstract: The surface properties of poly(ethylene glycol) (PEG) films have been modified using gold particles functionalized with block copolymer-based ligands of poly(styrene) (PS) and PEG. The ligands were synthesized using Diels-Alder chemistry to join the PS and PEG blocks into linear diblock copolymers, which were attached to gold particles with a thiol terminal functionality on the PS block. The block copolymer ligands compatibilized the Au particles by creating a PEG shell around the Au and PS core. The Diels-Alder linkage, however, is temperature sensitive, and by annealing the films at 90 ¿C, the PEG blocks of the ligand were separated from the PS-functionalized Au core. The Au particles were thus rendered immiscible in the PEG matrices and migrated to the film surfaces.
Distribution: Approved for public release
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Last Update / Reviewed: June 1, 2007