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Characterization of nonionic and cationic amine‐functional polymers by aqueous SEC‐MALLS
Author(s) -
Nagy Dennis J.
Publication year - 1996
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/(sici)1097-4628(19960228)59:9<1479::aid-app16>3.0.co;2-u
Subject(s) - cationic polymerization , aqueous solution , amine gas treating , polymer , characterization (materials science) , polymer chemistry , materials science , chemistry , functional polymers , chemical engineering , organic chemistry , polymer science , copolymer , nanotechnology , engineering
Molecular weight, root‐mean‐square radius, and conformational information obtained from aqueous size exclusion chromatography (SEC) and multiangle laser light‐scattering (MALLS) detection are examined for amine‐functional polymers. These include homopolymers and copolymers of poly(ethenylformamide) and cationic poly(vinylamine). Light‐scattering studies for poly(ethenylformamide) employing 15 angles of detection are used to calculate molecular weights as high as 700,000 daltons with a root‐mean‐square radius of nearly 50 nm. Calculated conformational coefficients indicate a random‐coil configuration at low molecular weights and a more compacted conformation at high molecular weights. Molecular weights and root‐mean‐square radius values for cationic poly(vinylamine) are determined using a three‐angle MALLS detector. Root‐mean‐square radius is strongly dependent on the ionic strength of the mobile phase. Cationic poly(vinylamine) exhibits a rod‐like conformation at both low and high ionic strength. Explanations are proposed for this behavior. © 1996 John Wiley & Sons, Inc.