Liquid Crystalline Phosphazenes Bearing Biphenyl Mesogenic Groups

Harry R. Allcock, Chulhee Kim

Research output: Contribution to journalArticle

76 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)3881-3887
Number of pages7
JournalMacromolecules
Volume23
Issue number17
DOIs
StatePublished - Jan 1 1990

Fingerprint

Bearings (structural)
Polymers
Crystalline materials
Liquids
Textures
Derivatives
diphenyl

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Allcock, Harry R. ; Kim, Chulhee. / Liquid Crystalline Phosphazenes Bearing Biphenyl Mesogenic Groups. In: Macromolecules. 1990 ; Vol. 23, No. 17. pp. 3881-3887.
@article{b55abdccef294938b28489bea3717f88,
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.",
author = "Allcock, {Harry R.} and Chulhee Kim",
year = "1990",
month = "1",
day = "1",
doi = "10.1021/ma00219a003",
language = "English (US)",
volume = "23",
pages = "3881--3887",
journal = "Macromolecules",
issn = "0024-9297",
publisher = "American Chemical Society",
number = "17",

}

Liquid Crystalline Phosphazenes Bearing Biphenyl Mesogenic Groups. / Allcock, Harry R.; Kim, Chulhee.

In: Macromolecules, Vol. 23, No. 17, 01.01.1990, p. 3881-3887.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Liquid Crystalline Phosphazenes Bearing Biphenyl Mesogenic Groups

AU - Allcock, Harry R.

AU - Kim, Chulhee

PY - 1990/1/1

Y1 - 1990/1/1

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.

UR - http://www.scopus.com/inward/record.url?scp=0025468464&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0025468464&partnerID=8YFLogxK

U2 - 10.1021/ma00219a003

DO - 10.1021/ma00219a003

M3 - Article

AN - SCOPUS:0025468464

VL - 23

SP - 3881

EP - 3887

JO - Macromolecules

JF - Macromolecules

SN - 0024-9297

IS - 17

ER -