Jiang, W.; Mehl, G.H. Design and Investigation of a Side-Chain Liquid Crystalline Polysiloxane with a Ntb-Phase-Forming Side Chain. Crystals2023, 13, 1614.
Jiang, W.; Mehl, G.H. Design and Investigation of a Side-Chain Liquid Crystalline Polysiloxane with a Ntb-Phase-Forming Side Chain. Crystals 2023, 13, 1614.
Jiang, W.; Mehl, G.H. Design and Investigation of a Side-Chain Liquid Crystalline Polysiloxane with a Ntb-Phase-Forming Side Chain. Crystals2023, 13, 1614.
Jiang, W.; Mehl, G.H. Design and Investigation of a Side-Chain Liquid Crystalline Polysiloxane with a Ntb-Phase-Forming Side Chain. Crystals 2023, 13, 1614.
Abstract
A new mesogenic non-symmetric dimeric monomer with a terminal olefin function, forming a twist bend nematic (Ntb) as well as a nematic (N) phase was synthesized, using an enhanced synthetic methodology, which avoids isomerization of the terminal double bond in the preparation of the dimer. This monomer was attached to a pentamethyldisiloxane group, resulting in SmA LC phase behaviour of the ensuing material. Linking the monomer to a siloxane main chain resulted in nematic phase behaviour. Detailed studies with the Ntb phase forming dimer DTC5C7 show full miscibility of the dimer and the new LC polymer in the LC state, suggesting that the side-chain LC polymer forms a Ntb phase as the low temperature nematic phase. Copolymerizing the monomer with a cyanobiphenyl based monomer allows to tune the glass transition and phase behavior further.
Keywords
side chain liquid crystal polymer; pentamethydisiloxane; Ntb phase; isomers of coupling reaction; non-symmetry dimer; liquid crystal monomers
Subject
Chemistry and Materials Science, Materials Science and Technology
Copyright:
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