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Pathways to Macroscale Order in Nanostructured Block Copolymers

Chen, Zhong-Ren and Kornfield, Julia A. and Smith, Steven D. and Grothaus, Jeffrey T. and Satkowski, Michael M. (1997) Pathways to Macroscale Order in Nanostructured Block Copolymers. Science, 277 (5330). pp. 1248-1253. ISSN 0036-8075. doi:10.1126/science.277.5330.1248.

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Polymeric materials undergo dramatic changes in orientational order in response to dynamic processes, such as flow. Their rich cascade of dynamics presents opportunities to create and combine distinct alignments of polymeric nanostructures through processing. In situ rheo-optical measurements complemented by ex situ x-ray scattering reveal the physics of three different trajectories to macroscopic alignment of lamellar diblock copolymers during oscillatory shearing. At the highest frequencies, symmetry arguments explain the transient development of a bimodal texture en route to the alignment of layers parallel to the planes of shear. At lower frequencies, larger-scale relaxations introduce rearrangements out of the deformation plane that permit the formation of lamellae perpendicular to the shear plane. These explain the change in the character of the pathway to parallel alignment and the emergence of perpendicular alignment as the frequency decreases.

Item Type:Article
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Kornfield, Julia A.0000-0001-6746-8634
Additional Information:© 1997 American Association for the Advancement of Science. This research was carried out with the support of NSF (grant CTS 9421015), the Air Force Office of Scientific Research (Liquid Crystals MURI), Chevron, and Raychem.
Funding AgencyGrant Number
NSFCTS 9421015
Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
Issue or Number:5330
Record Number:CaltechAUTHORS:20141203-091201329
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Official Citation:Pathways to Macroscale Order in Nanostructured Block Copolymers Zhong-Ren Chen, Julia A. Kornfield, Steven D. Smith, Jeffrey T. Grothaus, and Michael M. Satkowski Science 29 August 1997: 277 (5330), 1248-1253. [DOI:10.1126/science.277.5330.1248]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52310
Deposited By: Tony Diaz
Deposited On:03 Dec 2014 20:44
Last Modified:10 Nov 2021 19:24

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