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Published March 26, 2013 | Supplemental Material
Journal Article Open

Self-Assembly of Symmetric Brush Diblock Copolymers


Self-assembled structures of brush block copolymers (BrBCPs) with polylactide (PLA) and polystyrene (PS) side chains were studied. The polynorbornene-backbone-based BrBCPs containing approximately equal volume fractions of each block self-assembled into highly ordered lamellae with domain spacing ranging from 20 to 240 nm by varying molecular weight of the backbone in the bulk state, as revealed by small-angle X-ray scattering (SAXS). The domain size increased approximately linearly with backbone length, which indicated an extended conformation of the backbone in the ordered state. In situ SAXS measurements suggested that the BrBCPs self-assemble with an extremely fast manner which could be attributed to a reduced number of entanglements between chains. The strong segregation theory and Monte Carlo simulation also confirmed this near-linear dependence of the domain spacing on backbone length, rationalizing experimental results.

Additional Information

© 2013 American Chemical Society. Received for review December 19, 2012 and accepted January 31, 2013; published online January 31, 2013. This work was supported by the Department of Energy Office of Basic Energy Science under Contract Nos. DE-FG02-96ER45612 and DE-FG02-04ER46126 and the NSF-supported Materials Research Science and Engineering Center at UMass. Authors acknowledge the use of the Advanced Light Source, Berkeley National Laboratory, which was supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231; use of the National Synchrotron Light Source, Brookhaven National Laboratory, which was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DEAC02-98CH10886; use of the Advanced Photon Source, an Office of Science User Facility operated for the U.S.Department of Energy (DOE) Office of Science by Argonne National Laboratory, which was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357. J. Huh acknowledges the supports from Samsung Display, Korea.

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