Dimensions of Polymer Chains in Critical Semidilute Solutions

Journal Article · Tue Dec 31 23:00:00 EST 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.686· OSTI ID:439105

Melnichenko, Y; Wignall, G ^[1]

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1. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

In this Letter we present first measurements of the radius of gyration (R{sub g}) for polystyrene in deuterocyclohexane at the critical concentration of the polymer over a temperature range {Theta}{ge}T{ge}T{sup c} using small-angle neutron scattering and the high-concentration labeling methodology. We do not observe a reduction of R{sub g}(T{sup c}) at the critical temperature of phase demixing T{sup c} as compared to R{sub g}({Theta}) in the {Theta} region, which indicates that the critical polymer solution cannot be considered as an ensemble of partially collapsed noninterpenetrating coils. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Oak Ridge National Laboratory
• DOE Contract Number: AC05-96OR22464
• OSTI ID: 439105
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHAINS
CONFORMATIONAL CHANGES
CRITICAL TEMPERATURE
DIMENSIONS
NEUTRON DIFFRACTION
POLYSTYRENE
SMALL ANGLE SCATTERING
SOLUTIONS
TEMPERATURE DEPENDENCE