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Characterization of the interphase in poly(divinylbenzene)/poly( N ‐butyl acrylate) core/shell latexes by high‐resolution solid‐state NMR relaxation studies
Author(s) -
Nelliappan V.,
ElAasser M. S.,
Klein A.,
Daniels E. S.,
Roberts J. E.
Publication year - 1995
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1995.070580212
Subject(s) - interphase , materials science , divinylbenzene , monomer , emulsion polymerization , polymer chemistry , butyl acrylate , polymerization , acrylate , polymer , copolymer , methyl acrylate , relaxation (psychology) , chemical engineering , styrene , composite material , psychology , social psychology , genetics , engineering , biology
Abstract Poly(divinylbenzene)/poly( n ‐butyl acrylate) core/shell latexes were investigated using solid‐state 13 C‐NMR. The (H) T 1ρ relaxation time was found to be substantially affected by many of the seeded emulsion polymerization parameters, such as the core/shell ratio, the mode of addition of the second‐stage monomer, the addition rate of the second‐stage monomer, and the level of conversion of the seed latex at the time of addition of the second‐stage monomer. The existence of an interphase region between the core and shell polymers was detected. Maximum interphase region thickness was achieved when the butyl acrylate was added under starved conditions. The thickness of this interphase layer was calculated to be 5–7 nm based on a model proposed by McBriety. 1 Solid‐state NMR was found to be an excellent spectroscopic technique to probe the interphase region in core/shell latexes. © 1995 John Wiley & Sons, Inc.