Novel Mesogenic Vinyl Ketone Monomers and Their Based Polymers

In the present research, we have synthesized new vinyl ketone monomers with mesogenic substituents, namely, 8-(3'-chloro-4'-pentyl-[1,1'-biphenyl-4-oxy)oct-1-en-3-one ( ) and 8-[2'-chloro-4‴-octyl-[1,1':4',1″:4″,1‴-quaterphenyl-4-oxy]oct-1-en-3-one ( ). The comparison o...

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Bibliographic Details
Published in:Polymers 2022-12, Vol.15 (1), p.5
Main Authors: Derikov, Yaroslav I, Belousov, Daniil R, Finko, Alexander V, Shandryuk, Georgii A, Kuz'menok, Nina M, Mikhalyonok, Sergei G, Bezborodov, Vladimir S, Chernikova, Elena V, Talroze, Raisa V
Format: Article
Language:English
Subjects:
Addition polymerization
Alcohol
Analysis
Bulk polymerization
Chemical synthesis
Chromatography
Free radical polymerization
Free radicals
Ketones
Liquid crystals
Methods
Molecular weight
Monomers
Photodegradation
Polymerization
Polymers
Properties
Structure
Ultraviolet radiation
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Summary:In the present research, we have synthesized new vinyl ketone monomers with mesogenic substituents, namely, 8-(3'-chloro-4'-pentyl-[1,1'-biphenyl-4-oxy)oct-1-en-3-one ( ) and 8-[2'-chloro-4‴-octyl-[1,1':4',1″:4″,1‴-quaterphenyl-4-oxy]oct-1-en-3-one ( ). The comparison of , , and previously synthesized 8-((4″-(( )-4-butylcyclohexyl)-2'-chloro-[1,1',4',1″-terphenyl]-4-yl)oxy)oct-1-en-3-one ( ) has revealed that all of them are able to form crystals, while their ability to exhibit liquid crystalline behavior depends on the number of phenyl substituents attached to the para-position of the phenoxy group and is observed for and only. All of the monomers are able to achieve self-polymerization upon heating and free radical polymerization in bulk or in solution under the action of the common radical initiator AIBN. We have also succeeded in the RAFT polymerization of the synthesized vinyl ketones and using asymmetrical trithiocarbonates. The synthesized poly(vinyl ketones) exhibit LC behavior and are able to undergo photodegradation upon UV irradiation.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym15010005