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Comprehensive Triblock Copolymer Analysis by Coupled Thermal Field‐Flow Fractionation‐NMR
Author(s) -
van Aswegen Werner,
Hiller Wolf,
Hehn Mathias,
Pasch Harald
Publication year - 2013
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201300286
Subject(s) - copolymer , fractionation , materials science , chemical composition , field flow fractionation , molar mass , phase (matter) , polar , polymer chemistry , chemical engineering , polymer , analytical chemistry (journal) , chemistry , chromatography , organic chemistry , physics , composite material , engineering , astronomy
Thermal field‐flow fractionation (ThFFF) is used as a novel fractionation technique to investigate the molecular heterogeneity of PB‐b‐PVP‐b‐P t BMA triblock copolymers. Such copolymers cause major problems in liquid chromatography due to very strong polar interactions with the stationary phase. ThFFF separates the copolymers with regard to size and/or chemical composition based on the normal and thermal diffusion coefficients. The separation mechanism in ThFFF and the chemical composition of the separated species is elucidated by online 1 H NMR. Based on the compositional analysis and a calibration of the system with the respective homopolymers, the samples are quantified regarding their molar masses, chemical compositions, and microstructures providing comprehensive information on the complex structure of these block copolymers.