Shear-induced metastable states of end-grafted polystyrene

Journal Article · Mon Aug 15 00:00:00 EDT 2011 · Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print)

DOI:https://doi.org/10.1103/PHYSREVE.84.021803· OSTI ID:21611548

Sasa, Leslie A ^[1]; Yearley, Eric J; Jablin, Michael S; Majewski, Jaroslaw; Hjelm, Rex P ^[1]; Gilbertson, Robert D ^[2]; Lavine, Adrienne S ^[3]

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1. Los Alamos Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
3. Mechanical and Aerospace Engineering Department, University of California, Los Angeles, Los Angeles, California 90095 (United States)

The in situ molecular scale response of end-grafted polystyrene to shear against a deuterated polystyrene melt was investigated with neutron reflectometry. The derived grafted polystyrene density profiles showed that the grafted polystyrene was retained on the quartz wafer during the measurements. The profiles suggested that the end-grafted polystyrene response to shear results in a series of metastable states, rather than equilibrium states assumed in the current theory. Except for some possible extension and/or contraction of the grafted polystyrene with shear, there was no obvious correlation between the grafted polymer structure and the shear thinning behavior observed in these samples.

• OSTI ID: 21611548
• Journal Information: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print), Vol. 84, Issue 2; Other Information: DOI: 10.1103/PhysRevE.84.021803; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1539-3755
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
CONTRACTION
GRAFT POLYMERS
METASTABLE STATES
NEUTRONS
POLYSTYRENE
QUARTZ
BARYONS
ELEMENTARY PARTICLES
ENERGY LEVELS
EXCITED STATES
FERMIONS
HADRONS
MATERIALS
MINERALS
NUCLEONS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXIDE MINERALS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERS
POLYOLEFINS
POLYVINYLS
SYNTHETIC MATERIALS