skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: SANS (small-angle neutron scattering) evaluation of the RPA (random phase approximation) theory for binary homopolymer mixtures

Abstract

A well characterized binary mixture of normal (protonated) and perdeuterated monodisperse 1,2 polybutenes has been studied by small-angle neutron scattering (SANS). For scattering wavevectors q greater than the inverse radius-of-gyration R/sub g//sup -1/, the SANS intensity is quantitatively predicted by the random phase approximation (RPA) theory of deGennes over all measured values of the segment-segment interaction parameter Chi. In the region (Chi s-Chi)Chi s/sup -1/ > 0.5 the interaction parameter determined using the RPA theory for q > R/sub g//sup -1/ is greater than that calculated from the zero-angle intensity based on an Ornstein-Zernike plot, where Chi s represents the limit of single phase stability. These findings indicate a correlation between the critical fluctuation length xi and R/sub g/ which is not accounted for by the RPA theory.

Authors:
; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (USA); Bell Labs., Murray Hill, NJ (USA); Exxon Research and Engineering Co., Annandale, NJ (USA). Corporate Research Science Lab.
OSTI Identifier:
6653457
Report Number(s):
CONF-861274-1
ON: DE87004253
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Conference
Resource Relation:
Conference: Symposium on scattering from block copolymers and model systems, Boston, MA, USA, 1 Dec 1986; Other Information: Paper copy only, copy does not permit microfiche production
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; POLYMERS; STRUCTURE FACTORS; DEUTERATION; NEUTRONS; SMALL ANGLE SCATTERING; BARYONS; CHEMICAL REACTIONS; ELEMENTARY PARTICLES; FERMIONS; HADRONS; NUCLEONS; SCATTERING; 656002* - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-); 360601 - Other Materials- Preparation & Manufacture

Citation Formats

Bates, F S, Koehler, W C, Wignall, G D, and Fetters, L J. SANS (small-angle neutron scattering) evaluation of the RPA (random phase approximation) theory for binary homopolymer mixtures. United States: N. p., 1986. Web.
Bates, F S, Koehler, W C, Wignall, G D, & Fetters, L J. SANS (small-angle neutron scattering) evaluation of the RPA (random phase approximation) theory for binary homopolymer mixtures. United States.
Bates, F S, Koehler, W C, Wignall, G D, and Fetters, L J. Mon . "SANS (small-angle neutron scattering) evaluation of the RPA (random phase approximation) theory for binary homopolymer mixtures". United States. https://www.osti.gov/servlets/purl/6653457.
@article{osti_6653457,
title = {SANS (small-angle neutron scattering) evaluation of the RPA (random phase approximation) theory for binary homopolymer mixtures},
author = {Bates, F S and Koehler, W C and Wignall, G D and Fetters, L J},
abstractNote = {A well characterized binary mixture of normal (protonated) and perdeuterated monodisperse 1,2 polybutenes has been studied by small-angle neutron scattering (SANS). For scattering wavevectors q greater than the inverse radius-of-gyration R/sub g//sup -1/, the SANS intensity is quantitatively predicted by the random phase approximation (RPA) theory of deGennes over all measured values of the segment-segment interaction parameter Chi. In the region (Chi s-Chi)Chi s/sup -1/ > 0.5 the interaction parameter determined using the RPA theory for q > R/sub g//sup -1/ is greater than that calculated from the zero-angle intensity based on an Ornstein-Zernike plot, where Chi s represents the limit of single phase stability. These findings indicate a correlation between the critical fluctuation length xi and R/sub g/ which is not accounted for by the RPA theory.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {12}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: