Vapor treatment, liquid crystal formation, magnetic orientation, and crystallization (<scp>VLMC</scp>) to form helical polyisocyanides with oriented crystal‐like structure

Yonehara, Takuya; Hayashi, Hideharu; Nimori, Shigeki; Goto, Hiromasa

doi:10.1002/app.49408

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…The previous paper has reported on polymerization of chiral phenylisocyanide monomers in isotropic solution using NiCl 2 ·6H 2 O as catalyst . In this study, phenyl isocyanides modified with chiral side chains were prepared, and they have both monomer and chiral induction functions.…”

Section: Discussionmentioning

confidence: 99%

“…Chiral molecules may serve as chiral inducers (chiral dopants) to induce CLC (chiral) from nematic liquid crystals (achiral). In this study, we prepare PPI derivatives with branched alkyl chains in CLC and perform molecular orientation in the liquid crystal state with a magnetic field . The Ni complexes can be used for catalysts that are low-cost and convenient to handle compared with the Pd catalysts. − Vapor treatment, liquid crystal formation, magnetic orientation, and crystallization (VLMC) reported as an orientation method for PPI involves both formation of lyotropic liquid crystal of PPI by solvent vapor and anisotropic aggregation of PPI by magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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Self-Inductive Asymmetric Synthesis of Polyisocyanides in Liquid Crystal

et al. 2023

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Monomers grow by leaps and bounds in their enhanced environment. This study presents the synthesis of optically active polyisocyanides in a cholesteric liquid crystal (CLC) reaction field induced by itself and evaluates the liquid crystallinity of the resultant polymer and the magnetic orientation. Polymerization of a chiral isocyanide monomer in a chiral liquid crystal reaction field was performed. The chiral liquid crystal reaction field showing a fingerprint-like image under polarizing optical microscopy observations was prepared by adding a small amount of the chiral phenyl isocyanide with both monomer and chiral inducer functions for the formation of CLC from a nematic liquid crystal. Polymerization of the isocyanide monomer in the chiral liquid crystal reaction field prepared via chiral induction by itself produced poly(phenyl isocyanide) (PPI) with a one-handed helical structure. The asymmetric polymerization of the chiral monomer in CLC amplifies optical activity for the resultant polymer. The polymer thus prepared shows liquid crystallinity. Further, a magnetic orientation in the solvent vapor environment of the poly(phenyl isocyanides) was achieved. Synchrotron X-ray analysis evaluated the uniaxial orientation of PPI.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self-Inductive Asymmetric Synthesis of Polyisocyanides in Liquid Crystal

et al. 2023

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Electric-field-aligned liquid crystal polymer for doubling anisotropic thermal conductivity

Li,

Gong,

Zhang

et al. 2024

Commun Mater

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High thermal conductive polymers have become more important because equipment requires high performance, high-energy density, and high integration. There are different strategies to make high thermal conductive polymers, among which is the synthesis of polymers in the liquid crystal phase. However, the thermal conductivity of such material is rarely beyond 1 W m−1 K−1 because of the disordered molecular directionality. The disordered directionality between crystal zones limits the thermal conductivity in a specific direction. Here, we show a method for unifying the direction of crystal zones by applying an external electric field on the liquid crystal monomers. Meanwhile, by exposing the transparent equipment and specially designed photopolymerisable monomer in UV light, the liquid crystal monomer is in situ polymerised into a liquid crystal polymer with a high intrinsic thermal conductivity of 1.02 W m−1 K−1. The molecular alignment was characterised and resulted in the resultant high conductivity.

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Vapor treatment, liquid crystal formation, magnetic orientation, and crystallization (VLMC) to form helical polyisocyanides with oriented crystal‐like structure

Cited by 2 publications

References 12 publications

Self-Inductive Asymmetric Synthesis of Polyisocyanides in Liquid Crystal

Self-Inductive Asymmetric Synthesis of Polyisocyanides in Liquid Crystal

Electric-field-aligned liquid crystal polymer for doubling anisotropic thermal conductivity

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