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Toward Understanding the Architecture (Branching and MWD) of Crosslinked Acrylic Latexes
Author(s) -
Agirre Amaia,
Santos J. Ignacio,
Leiza Jose R.
Publication year - 2013
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/macp.201200482
Subject(s) - branching (polymer chemistry) , polymer chemistry , acrylate , polymer , copolymer , methacrylic acid , chemistry , size exclusion chromatography , acrylic acid , molar mass distribution , gel permeation chromatography , organic chemistry , enzyme
The architecture of crosslinked acrylic latexes of 2‐ethylhexyl acrylate, methacrylic acid, and a crosslinker agent are investigated. These polymers contain a significant amount of gel content. Branching is obtained by liquid‐ and melt‐state 13 C NMR spectroscopy. For the first time, the branching densities (long and short chains) of the soluble and gel fractions are measured independently. Branching is higher for the polymers produced with the most‐efficient crosslinkers, namely those which yield a higher crosslinking density. The branching (long chains) and the molecular‐weight distribution (MWD) of the soluble fraction are characterized by size‐exclusion chromatography (SEC) coupled with triple detection. Coelution of branched chains at large elution volumes is observed in the SEC chromatograms indicating the highly branched nature of the sol fractions of the latexes.