Microdomain contraction in microphase-separated multiblock copolymers

Journal Article · Tue Jun 01 00:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.47.14555· OSTI ID:6785586

Smith, S D ^[1]; Spontak, R J ^[2]; Satkowski, M M; Ashraf, A ^[1]; Lin, J S ^[3]

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1. Corporate Research Division, The Procter Gamble Company, Cincinnati, Ohio 45239 (United States)
2. Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States)
3. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

Linear multiblock copolymers, like their diblock analogs, undergo microphase separation and order into periodic morphologies when the blocks are sufficiently incompatible. To explore the conformations of such materials, four symmetric poly(styrene-[ital b]-isoprene)[sub [ital n]] copolymers with 2[ital n] (1[le][ital n][lt]=4) perfectly alternating blocks of nearly equal mass have been synthesized. Small-angle x-ray scattering reveals that the microdomain periodicity decreases with [ital n] along the lamellar normal, thereby confirming theoretical predictions and providing direct evidence for bridging among the 2([ital n][minus]1) middle blocks.

• OSTI ID: 6785586
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 47:21; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
COHERENT SCATTERING
CONFORMATIONAL CHANGES
COPOLYMERS
DIFFRACTION
DOMAIN STRUCTURE
LAMELLAE
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYMERS
SCATTERING
SMALL ANGLE SCATTERING
X-RAY DIFFRACTION