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

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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 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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title = "Liquid Crystalline Phosphazenes Bearing Biphenyl Mesogenic Groups",

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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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

Abstract

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