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Quantitative measurement of core coverage in core‐shell particles by solid‐state 1 H NMR spin‐diffusion experiments
Author(s) -
Mellinger F.,
Wilhelm M.,
Spiess H. W.,
Baumstark R.,
Haunschild A.
Publication year - 1999
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19990401)200:4<719::aid-macp719>3.0.co;2-n
Subject(s) - core (optical fiber) , diffusion , particle (ecology) , materials science , shell (structure) , spin diffusion , analytical chemistry (journal) , polymer chemistry , chemistry , composite material , thermodynamics , chromatography , physics , oceanography , geology
The shell material core coverages of two‐phase core‐shell particles are determined quantitatively by NMR spin‐diffusion experiments. A simple relation is derived between the specific surface (ratio of core surface and core volume) and the core coverage of acrylic core‐shell particles in the solid state. Through calibration with a reference sample of known core coverage, the core coverage of the other samples can then be evaluated. The values of core coverages determined by spin‐diffusion become more accurate as the core coverage becomes smaller. In a series of poly(methyl methacrylate) (PMMA) and poly(butyl acrylate) core‐shell latices, the core coverage was found to vary between 43 and 80%. Additionally, information about the global particle morphologies is derived from a quantitative comparison of the specific surface and the particle diameter measured by dynamic light scattering.