scholarly journals Vinyl Ether Oligomers with Conjugated-Polyene and Acetal Terminals: A New Chain-Transfer Mechanism for Cationic Polymerization of Vinyl Ethers

1984 ◽  
Vol 16 (3) ◽  
pp. 249-258 ◽  
Author(s):  
Sadahito Aoshima ◽  
Toshinobu Higashimura
Keyword(s):  
Vinyl Ether ◽  
Cationic Polymerization ◽  
Chain Transfer ◽  
Transfer Mechanism ◽  
Vinyl Ethers

scholarly journals Characteristics and Mechanism of Vinyl Ether Cationic Polymerization in Aqueous Media Initiated by Alcohol/B(C6F5)3/Et2O

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 500
Author(s):  
Jinghan Zhang ◽  
Yibo Wu ◽  
Kaixuan Chen ◽  
Min Zhang ◽  
Liangfa Gong ◽  
...  
Keyword(s):  
Vinyl Ether ◽  
Cationic Polymerization ◽  
Density Functional ◽  
Aqueous Media ◽  
Vinyl Ethers ◽  
Experimental Conditions ◽  
Functional Theory ◽  
Air Atmosphere ◽  
Significant Difference ◽  
First Time

Aqueous cationic polymerizations of vinyl ethers (isobutyl vinyl ether (IBVE), 2-chloroethyl vinyl ether (CEVE), and n-butyl vinyl ether (n-BVE)) were performed for the first time by a CumOH/B(C6F5)3/Et2O initiating system in an air atmosphere. The polymerization proceeded in a reproducible manner through the careful design of experimental conditions (adding initiator, co-solvents, and surfactant or decreasing the reaction temperature), and the polymerization characteristics were systematically tested and compared in the suspension and emulsion. The significant difference with traditional cationic polymerization is that the polymerization rate in aqueous media using B(C6F5)3/Et2O as a co-initiator decreases when the temperature is lowered. The polymerization sites are located on the monomer/water surface. Density functional theory (DFT) was applied to investigate the competition between H2O and alcohol combined with B(C6F5)3 for providing a theoretical basis. The effectiveness of the proposed mechanism for the aqueous cationic polymerization of vinyl ethers using CumOH/B(C6F5)3/Et2O was confirmed.

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