RT Journal Article
T1 Characterization of Comb Shaped MAA-co-PEGMA Copolymers Synthesized by Free-Radical Polymerization
A1 Emaldi, Iñaki
A1 Agirre, Amaia
A1 Etxeberria, Agustin
A1 Erkizia, Edurne
A1 Dolado, Jorge S.
A1 Leiza, Jose R.
AB Methacrylic acid-co-polyethylene glycol methacrylate (MAA-co-PEGMA) copolymers (also known as MPEG-type polycarboxylate ether (PCE) superplasticizers) present comb-shaped microstructure and they are generally used as dispersants of inorganic particles in cementitious formulations. Application properties of the PCEs strongly depend on the molecular structure and therefore accurate characterization of the microstructure is necessary to fully understand the structure–property relationship. In this work, MAA-co-PEGMA copolymers with various lateral size chain lengths and homogeneous copolymer compositions are synthesized by starved-feed semibatch copolymerization. Molar mass and radius of gyration distributions and monomer sequence distribution are measured using size exclusion chromatography coupled with multi angle light scattering (SEC/MALS/refractive index, RI) and 1H and 13C NMR, respectively. Furthermore, it is proved that the experimental radius of gyration compares well with the prediction of a theoretical model for the radius of gyration that uses characteristic parameters of the microstructure of the PCEs (e.g., average molar masses). This confirms the accuracy of the measurements of the absolute molar masses for the MPEG-type PCEs synthesized by free-radical (co)polymerization.
SN 1862-832X
YR 2020
FD 2020-12
LK https://hdl.handle.net/11556/3550
UL https://hdl.handle.net/11556/3550
LA eng
NO Emaldi , I , Agirre , A , Etxeberria , A , Erkizia , E , Dolado , J S & Leiza , J R 2020 , ' Characterization of Comb Shaped MAA-co-PEGMA Copolymers Synthesized by Free-Radical Polymerization ' , Macromolecular Reaction Engineering , vol. 14 , no. 6 , 2000015 . https://doi.org/10.1002/mren.202000015
NO Publisher Copyright: © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
NO The authors thank the financial support received from EUSKAMPUS Fundazioa, POLYMAT (UPV/EHU) and Tecnalia Research & Innovation to carry out this research. Financial support from the Basque Government (GV‐IT‐999‐16, PI2017‐11) and MINECO (CTQ2017‐87841‐R) is gratefully acknowledged. The SGIker J. I. Miranda is gratefully acknowledged for his help with the NMR analysis.
DS TECNALIA Publications
RD 29 jul 2024