Journal
LANGMUIR
Volume 31, Issue 19, Pages 5489-5494Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la504826w
Keywords
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Funding
- National Science Foundation [DMR-1122483]
- UNC EFRC: Solar Fuels and Next Generation Photovoltaics, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-EE0003188]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1407645] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1122483] Funding Source: National Science Foundation
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An azide-functionalized shape memory elastomer, poly(octylene diazoadipate-co-octylene adipate), has been grafted with poly(oligoethylene glycol) methacrylate (poly(OEGMA)) brushes via aqueous ARGET (activators regenerated by electron transfer) ATRP. Sequential swelling of the substrate followed by a grafting-from reaction yielded an incompressible brush layer on the shape-memory substrate. Upon heating the substrate above the T-m to return to the primary shape, uniaxial wrinkles perpendicular to the direction of strain with sizes of 27-33 mu m appear in addition to micrometer-sized features formed on the temporary shape after grafting. Swelling equilibration time (t(1)) and grafting reaction time (t(2)) were varied to control wrinkle formation and size. In this manner, we were able to create unique, anisotropic hierarchical surface structures with different length scales and patterns.
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