New ferroelectric liquid crystals with a trifluoromethyl group

Saitoh, Goroh; Nakamura, Toyokazu; Suzuki, Masayoshi; Satoh, Masahiro; Yoshio, Kunikio; Watanabe, Tetsuya

doi:10.1080/02678299308027713

Cited by 10 publications

(1 citation statement)

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“…Seguindo a mesma linha de raciocínio, Saitoh e colaboradores 24 descreveram a síntese de novos tolanos quirais com o grupo trifluormetil, incorporado na ramificação quiral. A estratégia de síntese é mostrada a seguir, de acordo com o Esquema 6.…”

Section: Síntese De Tolanos Quiraisunclassified

Cristais Líquidos Ferroelétricos - CLF. Uma abordagem sintética

2001

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Section: Síntese De Tolanos Quiraisunclassified

Cristais Líquidos Ferroelétricos - CLF. Uma abordagem sintética

2001

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Molecular engineering of liquid crystalline polymers by “living” polymerization. XXXII. Synthesis and “living” cationic polymerization of 3‐fluoro‐4′‐(ω‐vinyloxyalkoxy)‐4‐biphenylyl (2r,3s)‐2‐fluoro‐3‐methylpentanoate with undecanyl and octyl alkyl groups

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Oda

1995

J. Polym. Sci. A Polym. Chem.

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The synthesis and “living” cationic polymerization of 3‐fluoro‐4′‐(11‐vinyloxyundecany‐loxy)‐4‐biphenylyl (2R,3S)‐2‐fluoro‐3‐methylpentanoate (12‐11) and 3‐fluoro‐4′‐(8‐vi‐nyloxyoctyloxy)‐4‐biphenylyl (2R,3S)‐2‐fluoro‐3‐methylpentanoate (12‐8) are presented. Poly (12‐11)s and poly (12‐8)s with degrees of polymerization from 4.0 to 16.5 and poly‐dispersities ≤ 1.13 have been synthesized and characterized by differential scanning cal‐orimetry (DSC) and thermal optical polarized microscopy. Over the entire range of molecular weights poly (12‐11)s and poly (12‐8)s exhibit an enantiotropic SA and an unidentified SX phase. In addition, regardless of its molecular weight, poly (12‐8) exhibits a S*c phase in between the SA and Sx phases. Poly (12‐11) and poly (12‐8) show lower transition tem‐peratures and broader temperature ranges of all their mesophases as compared to the corresponding polymers without a fluorine atom on the biphenyl group. The role of the connecting group between the biphenyl and chiral group of the mesogenic unit on the phase behavior of these polymers is also discussed. Copolymers of 12‐8 with (2R,3S)‐2‐fluoro‐3‐methylpentyl 4′‐(11‐vinyloxyundecanyloxy)biphenyl‐4‐carboxylate (13‐11) {i.e., poly‐[(12‐8)‐co‐(13‐11)] (X/Y), where X/Y represents the molar ratio of monomer 12‐8 to monomer 13‐11} with DP of ca. 11 and polydispersities lower than 1.23 were also syn‐thesized and characterized. Their SA and S*c mesophases exhibit continuous dependences of composition and this support the assignment of the mesophases exhibited by poly (12‐8). © 1995 John Wiley & Sons, Inc.

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