Liquid Crystalline Phosphazenes Bearing Biphenyl Mesogenic Groups

Harry R. Allcock; Chulhee Kim

doi:10.1021/ma00219a003

Liquid Crystalline Phosphazenes Bearing Biphenyl Mesogenic Groups

Harry R. Allcock
, Chulhee Kim

Research output: Contribution to journal › Article › peer-review

80 Scopus citations

Abstract

New thermotropic liquid crystalline phosphazene cyclic trimers and high polymers have been prepared by the incorporation of biphenyl derivative units connected to the skeleton by oligomeric ethyl- eneoxy spacer units. The cyclic trimer [NP|0(CH₂CH₂O)₂C₆H₄C₆H₄CN}₂]₃ showed monotropic nematic schlieren texture between 102 and 59 °C. The phosphazene cyclic trimers and high polymers [NP{O-(CH₂CH₂O)₃C₆H₄C₆H₄R}₂]₃ and_n, where R = OMe, OEt, OPr-n, OPr-i, and OBu-n, have been synthesized. None of these cyclic trimers were liquid crystalline, but all the polymers showed enantiotropic liquid crystallinity.

Original language	English (US)
Pages (from-to)	3881-3887
Number of pages	7
Journal	Macromolecules
Volume	23
Issue number	17
DOIs	https://doi.org/10.1021/ma00219a003
State	Published - Jan 1 1990

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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abstract = "New thermotropic liquid crystalline phosphazene cyclic trimers and high polymers have been prepared by the incorporation of biphenyl derivative units connected to the skeleton by oligomeric ethyl- eneoxy spacer units. The cyclic trimer [NP|0(CH2CH2O)2C6H4C6H4CN\}2]3 showed monotropic nematic schlieren texture between 102 and 59 °C. The phosphazene cyclic trimers and high polymers [NP\{O-(CH2CH2O)3C6H4C6H4R\}2]3 andn, where R = OMe, OEt, OPr-n, OPr-i, and OBu-n, have been synthesized. None of these cyclic trimers were liquid crystalline, but all the polymers showed enantiotropic liquid crystallinity.",

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T1 - Liquid Crystalline Phosphazenes Bearing Biphenyl Mesogenic Groups

AU - Allcock, Harry R.

AU - Kim, Chulhee

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N2 - New thermotropic liquid crystalline phosphazene cyclic trimers and high polymers have been prepared by the incorporation of biphenyl derivative units connected to the skeleton by oligomeric ethyl- eneoxy spacer units. The cyclic trimer [NP|0(CH2CH2O)2C6H4C6H4CN}2]3 showed monotropic nematic schlieren texture between 102 and 59 °C. The phosphazene cyclic trimers and high polymers [NP{O-(CH2CH2O)3C6H4C6H4R}2]3 andn, where R = OMe, OEt, OPr-n, OPr-i, and OBu-n, have been synthesized. None of these cyclic trimers were liquid crystalline, but all the polymers showed enantiotropic liquid crystallinity.

AB - New thermotropic liquid crystalline phosphazene cyclic trimers and high polymers have been prepared by the incorporation of biphenyl derivative units connected to the skeleton by oligomeric ethyl- eneoxy spacer units. The cyclic trimer [NP|0(CH2CH2O)2C6H4C6H4CN}2]3 showed monotropic nematic schlieren texture between 102 and 59 °C. The phosphazene cyclic trimers and high polymers [NP{O-(CH2CH2O)3C6H4C6H4R}2]3 andn, where R = OMe, OEt, OPr-n, OPr-i, and OBu-n, have been synthesized. None of these cyclic trimers were liquid crystalline, but all the polymers showed enantiotropic liquid crystallinity.

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Liquid Crystalline Phosphazenes Bearing Biphenyl Mesogenic Groups

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