

FOLLOWUS
a.Beijing Engineering Research Center of Syntheses and Applications of Waterborne Polymers College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
b.Analytical and Testing Center, Beijing University of Chemical Technology, Beijing 100029, China
mayh@mail.buct.edu.cn (Y.H.M.)
yangwt@mail.buct.edu.cn (W.T.Y.)
Received:14 February 2023,
Revised:2023-4-1,
Accepted:07 April 2023,
Online First:18 May 2023,
Published:01 December 2023
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Zhang, Y. X.; Chen, D.; Hu, G. F.; Ma, Y. H.; Yang, W. T. Conventional radical and RAFT alternating copolymerizations of hydroxyalkyl vinyl ethers and dialkyl maleates. Chinese J. Polym. Sci. 2023, 41, 1856–1867
Yan-Xin Zhang, Dong Chen, Gao-Fei Hu, et al. Conventional Radical and RAFT Alternating Copolymerizations of Hydroxyalkyl Vinyl Ethers and Dialkyl Maleates[J]. Chinese Journal of Polymer Science, 2023, 41(12): 1856-1867.
Zhang, Y. X.; Chen, D.; Hu, G. F.; Ma, Y. H.; Yang, W. T. Conventional radical and RAFT alternating copolymerizations of hydroxyalkyl vinyl ethers and dialkyl maleates. Chinese J. Polym. Sci. 2023, 41, 1856–1867 DOI: 10.1007/s10118-023-2989-0.
Yan-Xin Zhang, Dong Chen, Gao-Fei Hu, et al. Conventional Radical and RAFT Alternating Copolymerizations of Hydroxyalkyl Vinyl Ethers and Dialkyl Maleates[J]. Chinese Journal of Polymer Science, 2023, 41(12): 1856-1867. DOI: 10.1007/s10118-023-2989-0.
The alternating copolymers of hydroxylvinyl ethers and dialkyl maleates have been synthesized by both conventional radical and RAFT polymerizations. The effects of comonomer structure
comonomer feed ratio and monomer concentration on the alternating copolymerization were investigated in detail.
The alternating copolymerization of hydroxyalkyl vinyl ethers and dialkyl maleates is investigated by conventional radical polymerization and reversible addition-fragmentation chain transfer polymerization (RAFT). The influence of comonomer structure
comonomer feeding ratios
and monomer concentrations on the copolymerization and the copolymer structure have been investigated systematically. With 2-hydroxyethyl vinyl ether (HEVE) and dimethyl maleates (DMM) as comonomers
a well-defined alternating copolymer is prepared with
M
n
=3400 and
M
w
/
M
n
=1.93 up to 71.6% monomer. The alternating sequential chain structure of the copolymers has been proved by both NMR and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). The experimental reactivity ratios and theoretical calculated highest occupied molecular orbital and the lowest unoccupied molecular orbital of vinyl ethers and alkyl maleates support that these monomer pairs have tendency to form alternating copolymers. With 2-cyanopropan-2-yl
N
-methyl-
N
-(pyridin-4-yl)carbamodithioate as the RAFT agent
the molecular weight of HEVE and DMM copolymer increases with the monomer conversion
demonstrating a controlled radical polymerization feature with well-controlled molecular weight and relatively narrower molecular weight distribution. With alternating copolymer of HEVE and DMM as macro-CTA (
M
n
=5200 and
M
w
/
M
n
=1.46)
both the chain extension with HEVE and DMM (
M
n
=10400 and
M
w
/
M
n
=1.72) and block copolymerization with vinyl acetate have been successfully achieved (
M
n
=8500 and
M
w
/
M
n
=1.52).
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