A Study on Physical Properties of Cyclic Poly(vinyl ether)s Synthesized via Ring-Expansion Cationic Polymerization

2017 ◽  
Vol 50 (3) ◽  
pp. 841-848 ◽  
Author(s):  
Hajime Kammiyada ◽  
Makoto Ouchi ◽  
Mitsuo Sawamoto
Keyword(s):  
Physical Properties ◽  
Vinyl Ether ◽  
Cationic Polymerization ◽  
Ring Expansion

A convergent approach to ring polymers with narrow molecular weight distributions through post dilution in ring expansion cationic polymerization

2016 ◽  
Vol 7 (45) ◽  
pp. 6911-6917 ◽  
Author(s):  
Hajime Kammiyada ◽  
Makoto Ouchi ◽  
Mitsuo Sawamoto
Keyword(s):  
Molecular Weight ◽  
Vinyl Ether ◽  
Cationic Polymerization ◽  
Ring Expansion ◽  
Molecular Weight Distributions ◽  
Weight Distributions ◽  
Fused Ring ◽  
Ring Polymers ◽  
Convergent Approach

In this paper, we demonstrate a convergent approach to convert “fused” ring chains obtained via ring expansion cationic polymerization of vinyl ether with a hemiacetal ester (HAE)-based ring initiator (1) into “sing” ring ones of narrow MWDs.

Construction of ring-based architectures via ring-expansion cationic polymerization and post-polymerization modification: design of cyclic initiators from divinyl ether and dicarboxylic acid

2021 ◽  
Author(s):  
Naoyuki Kusuyama ◽  
Yuji Daito ◽  
Hiroyuki Kubota ◽  
Yuki Kametani ◽  
Makoto Ouchi
Keyword(s):  
Dicarboxylic Acid ◽  
Vinyl Ether ◽  
Cationic Polymerization ◽  
Ring Expansion ◽  
Divinyl Ether

Topologically unique polymers such as tadpole and figure-eight polymers were synthesized via ring-expansion cationic polymerization (RECP) of vinyl ether with a functionalized cyclic initiator, followed by post-polymerization modification (PPM) reactions.

Catalyst-controlled stereoselective cationic polymerization of vinyl ethers

Science ◽  
2019 ◽  
Vol 363 (6434) ◽  
pp. 1439-1443 ◽  
Author(s):  
A. J. Teator ◽  
F. A. Leibfarth
Keyword(s):  
Physical Properties ◽  
Tensile Properties ◽  
Vinyl Ether ◽  
Cationic Polymerization ◽  
Vinyl Monomers ◽  
Next Generation ◽  
Vinyl Ethers ◽  
Engineering Applications ◽  
Vinyl Polymers ◽  
Order Of Magnitude

The tacticity of vinyl polymers has a profound effect on their physical properties. Despite the well-developed stereoselective methods for the polymerization of propylene and other nonpolar α-olefins, stereoselective polymerization of polar vinyl monomers has proven more challenging. We have designed chiral counterions that systematically bias the reactivity and chain-end stereochemical environment during cationic polymerization. This approach overrides conventional chain-end stereochemical bias to achieve catalyst-controlled stereoselective polymerization. We demonstrate that this method is general to vinyl ether substrates, providing access to a range of isotactic poly(vinyl ether)s with high degrees of isotacticity. The obtained materials display the tensile properties of commercial polyolefins but adhere more strongly to polar substrates by an order of magnitude, indicating their promise for next-generation engineering applications.

Magnesium Bromide (MgBr2) as a Catalyst for Living Cationic Polymerization and Ring-Expansion Cationic Polymerization

2021 ◽  
Author(s):  
Yuji Daito ◽  
Reina Kojima ◽  
Naoyuki Kusuyama ◽  
Yasuhiro Kohsaka ◽  
Makoto Ouchi
Keyword(s):  
Vinyl Ether ◽  
Cationic Polymerization ◽  
Ring Expansion ◽  
Magnesium Bromide ◽  
Effective Catalyst ◽  
Living Cationic Polymerization ◽  
Cationic Polymerizations

Magnesium bromide (MgBr2) was found as an effective catalyst for ring-expansion cationic polymerizations of isobutyl vinyl ether (IBVE) initiated by a “cyclic” hemiacetal ester (HAE) bond-based initiator leading to syntheses...

Living Cationic Polymerization of Vinyl Ether with a Thienyl Group

2015 ◽  
Vol 72 (7) ◽  
pp. 433-439
Author(s):  
Takeshi NAMIKOSHI ◽  
Ayaka KANEDA ◽  
Takashi MIYANAGA ◽  
Shinji WATANABE ◽  
Miki MURATA
Keyword(s):  
Vinyl Ether ◽  
Cationic Polymerization ◽  
Living Cationic Polymerization ◽  
Thienyl Group
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