Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 6, Pages 1491-1494Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201609360
Keywords
block copolymers; gels; micelles; nanostructures; self-assembly
Categories
Funding
- National Science Foundation [DMR-1105622, CBET-1335787]
- Center for Functional Nanomaterials, a U.S. DOE Office of Science Facility, at Brookhaven National Laboratory [DE-SC0012704]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1335787] Funding Source: National Science Foundation
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The thermal response of semi-dilute solutions (5 w/w%) of two amphiphilic thermoresponsive poly(ethylene oxide)-b-poly(N,N-diethylacrylamide)-b-poly(N,N-dibutylacrylamide) (PEO45-PDEAmx-PDBAm12) triblock copolymers, which differ only in the size of the central responsive block, in water was examined. Aqueous PEO45-PDEAm41-PDBAm12 solutions, which undergo a thermally induced sphere-to-worm transition in dilute solution, were found to reversibly form soft (G approximate to 10Pa) free-standing physical gels after 10min at 55 degrees C. PEO45-PDEAm89-PDBAm12 copolymer solutions, which undergo a thermally induced transition from spheres to large compound micelles (LCM) in dilute solution, underwent phase separation after heating at 55 degrees C for 10min owing to sedimentation of LCMs. The reversibility of LCM formation was investigated as a non-specific method for removal of a water-soluble dye from aqueous solution. The composition and size of the central responsive block in these polymers dictate the microscopic and macroscopic response of the polymer solutions as well as the rates of transition between assemblies.
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