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Poly(acrylic acid): A Combined Analysis with Field‐Flow Fractionation and SAXS
Author(s) -
Knappe Patrick,
Bienert Ralf,
Weidner Steffen,
Thünemann Andreas F.
Publication year - 2010
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.201000163
Subject(s) - small angle x ray scattering , polyelectrolyte , radius of gyration , polymer , fractionation , gyration , field flow fractionation , polymer chemistry , acrylic acid , materials science , scattering , molar mass distribution , chemistry , polymer science , composite material , chromatography , optics , copolymer , physics , geometry , mathematics
Polyelectrolytes such as PAA and its salts are widely used, but are notoriously difficult to characterize due to their polyelectrolyte properties and broad molecular mass distributions. In this paper, we report on a new PAA analysis by combining asymmetrical flow field‐flow fractionation and an advanced SAXS technique using an acoustic levitator to minimize background scattering. The proof‐of‐principle is demonstrated with a mixture of three standard PAAs with different molecular masses. Detailed information on the PAA fractions is available on radii of gyration, polymer contour lengths, and coil conformation. Our method is expected to be applicable for a wide range of water‐soluble synthetic and natural polymers and ideal for molecular masses of 5 × 10 3 –2 × 10 5 g · mol −1 .