Research output: Contribution to journal › Article › peer-review
SEC analysis of copolymers of different topologies with branched and linear copolyimides with PMMA blocks as a model system. / Kashina, A. V.; Meleshko, T. K.; Bezrukova, M. A.; Yakimansky, A. V.
In: European Polymer Journal, Vol. 140, 110031, 05.11.2020.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - SEC analysis of copolymers of different topologies with branched and linear copolyimides with PMMA blocks as a model system
AU - Kashina, A. V.
AU - Meleshko, T. K.
AU - Bezrukova, M. A.
AU - Yakimansky, A. V.
N1 - Funding Information: The work was supported by Russian Science Foundation (project № 20-13-00270 ). Publisher Copyright: © 2020 Elsevier Ltd Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/11/5
Y1 - 2020/11/5
N2 - For grafted copolyimides with variable length and grafting density of polymethylmethacrylate side chains, the molecular masses were determined using three modes of SEC analysis, which differ in the detectors set. The results were compared with the values obtained (i) using 1H NMR spectra, (ii) those calculated by summing the molecular masses of homopolymer linear blocks that make up the copolymer, as well as (iii) with the absolute values of molecular masses determined by sedimentation-diffusion analysis. It is shown that for branched grafted copolyimides the use of only a refractometric detector or its combination with a viscometric detector in the SEC analysis did not allow for obtaining reliable molecular masses. On the contrary, the combination of refractometric and viscometric detectors with a light scattering detector provided for the determination of the molecular masses close to the respective absolute values. It is also shown that for linear block copolymers, unlike branched copolymers, the molecular masses close to the absolute values can be obtained using any of the three modes of SEC analysis. For the first time, a concept of the critical molecular mass of the side chains of grafted copolyimides is introduced as a quantitative criterion that takes into account the total length and also the density of grafting of the side chains.
AB - For grafted copolyimides with variable length and grafting density of polymethylmethacrylate side chains, the molecular masses were determined using three modes of SEC analysis, which differ in the detectors set. The results were compared with the values obtained (i) using 1H NMR spectra, (ii) those calculated by summing the molecular masses of homopolymer linear blocks that make up the copolymer, as well as (iii) with the absolute values of molecular masses determined by sedimentation-diffusion analysis. It is shown that for branched grafted copolyimides the use of only a refractometric detector or its combination with a viscometric detector in the SEC analysis did not allow for obtaining reliable molecular masses. On the contrary, the combination of refractometric and viscometric detectors with a light scattering detector provided for the determination of the molecular masses close to the respective absolute values. It is also shown that for linear block copolymers, unlike branched copolymers, the molecular masses close to the absolute values can be obtained using any of the three modes of SEC analysis. For the first time, a concept of the critical molecular mass of the side chains of grafted copolyimides is introduced as a quantitative criterion that takes into account the total length and also the density of grafting of the side chains.
KW - Copolyimides
KW - Grafted copolymers
KW - NMR
KW - Sedimentation-diffusion analysis
KW - Size-exclusion chromatography
KW - Triple detection
KW - GRAFT-COPOLYMERS
KW - MOLECULAR POLYIMIDE BRUSHES
KW - TRIBLOCK COPOLYMERS
KW - POLY(METHYL METHACRYLATE)
KW - RADICAL POLYMERIZATION
KW - POLY(EPSILON-CAPROLACTONE)
KW - MORPHOLOGY
UR - http://www.scopus.com/inward/record.url?scp=85091201589&partnerID=8YFLogxK
U2 - 10.1016/j.eurpolymj.2020.110031
DO - 10.1016/j.eurpolymj.2020.110031
M3 - Article
AN - SCOPUS:85091201589
VL - 140
JO - European Polymer Journal
JF - European Polymer Journal
SN - 0014-3057
M1 - 110031
ER -
ID: 70764867