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Published in: Polymer Bulletin 11/2023

21-12-2022 | ORIGINAL PAPER

Synthesis of block copolymer of vinyl acetate and methyl acrylate by cobalt-mediated radical polymerization in a packed column system: simultaneous control of molecular weight, separation, and purification

Authors: Alireza Sabzevari, Arezoo Sh Dadkhah, Mohammad Kohestanian, Athar Mahdieh, Mohammad Ali Semsarzadeh

Published in: Polymer Bulletin | Issue 11/2023

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Abstract

In this study, for the first time, we investigate cobalt-mediated radical block copolymerization of vinyl acetate (VAc) and methyl acrylate (MA) in a packed column system in the presence of cobalt(II) acetylacetonate (Co (acac)2) as a controlling agent. This copolymerization system has the capability to remove the residual catalyst and separate copolymers with different molecular weights, simultaneous to polymerization. Synthesis of high-purity poly (vinyl acetate)-b-poly(methyl acrylate-co-vinyl acctate) (PVAc-b-P(MA-co-VAc)) copolymers were successfully performed by initiating the radical copolymerization of MA and VAc from PVAc-Co (acac)2 macroinitiator in the packed column with silica gel particles. Copolymerization reaction proceeds via a controlled characteristic with first-order kinetics with respect to monomers, predetermined molecular weight, and relatively narrow molecular weight distribution. GPC, 1HNMR, and DSC analyses demonstrated that the PVAc-b-P(MA-co-VAc) was formed with a blocky structure. Based on the analyses, it was found that the VAc content in the block copolymer progressively increased with increasing conversion in the constant VAc initial ratio, indicating that the second block copolymer had a gradient sequence distribution. Moreover, the VAc and MA reactivity ratios in the packed column with silica gel particles were calculated using the extended Kelen–Tudos method to be rMA = 4.98 and rVAc = 0.62, respectively.

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Metadata
Title
Synthesis of block copolymer of vinyl acetate and methyl acrylate by cobalt-mediated radical polymerization in a packed column system: simultaneous control of molecular weight, separation, and purification
Authors
Alireza Sabzevari
Arezoo Sh Dadkhah
Mohammad Kohestanian
Athar Mahdieh
Mohammad Ali Semsarzadeh
Publication date
21-12-2022
Publisher
Springer Berlin Heidelberg
Published in
Polymer Bulletin / Issue 11/2023
Print ISSN: 0170-0839
Electronic ISSN: 1436-2449
DOI
https://doi.org/10.1007/s00289-022-04652-x

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