Translating Thermal Response of Triblock Copolymer Assemblies in Dilute Solution to Macroscopic Gelation and Phase Separation
- Stony Brook Univ., NY (United States). Dept. of Chemistry
- Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
- Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials; Columbia Univ., New York, NY (United States). Dept. of Chemical Engineering. Dept. of Applied Physics and Applied Mathematics
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 in this paper. Aqueous PEO45-PDEAm41-PDBAm12 solutions, which undergo a thermally induced sphere-to-worm transition in dilute solution, were found to reversibly form soft (G'≈10 Pa) free-standing physical gels after 10 min at 55 °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 °C for 10 min 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. Finally, 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.
- Research Organization:
- Stony Brook Univ., NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- Contributing Organization:
- Columbia Univ., New York, NY (United States)
- Grant/Contract Number:
- SC0012704; DMR-1105622; CBET-1335787
- OSTI ID:
- 1361270
- Report Number(s):
- BNL-113913-2017-JA; KC0403020
- Journal Information:
- Angewandte Chemie (International Edition), Vol. 56, Issue 6; ISSN 1433-7851
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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