INFLUENCE OF BACKBONE RIGIDITY ON THE LIQUID CRYSTALLINITY OF MESOGEN-CONTAINING POLYACETYLENES*

KONG XiangXing; WAN Xinhua; KWOK Hoi Sing; FENG Xinde; TANG Benzhong

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INFLUENCE OF BACKBONE RIGIDITY ON THE LIQUID CRYSTALLINITY OF MESOGEN-CONTAINING POLYACETYLENES*

Papers | Updated：2021-06-21

- INFLUENCE OF BACKBONE RIGIDITY ON THE LIQUID CRYSTALLINITY OF MESOGEN-CONTAINING POLYACETYLENES*
- Vol. 16, Issue 2, Pages: 185-192(1998)
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- Published：20 June 1998
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KONG XiangXing, WAN Xinhua, KWOK Hoi Sing, et al. INFLUENCE OF BACKBONE RIGIDITY ON THE LIQUID CRYSTALLINITY OF MESOGEN-CONTAINING POLYACETYLENES*[J]. 1998, 16(2): 185-192.
DOI：

KONG XiangXing, WAN Xinhua, KWOK Hoi Sing, et al. INFLUENCE OF BACKBONE RIGIDITY ON THE LIQUID CRYSTALLINITY OF MESOGEN-CONTAINING POLYACETYLENES*[J]. 1998, 16(2): 185-192. DOI：

摘要

Two acetylene polymers containing cyanobiphenyl-based mesogens

poly { 10-[ ((4'- cyano-4-biphenylyl ) oxy ) carbonyl] - 1 -decyne } (PA8CN )

which has a relativelyfiexible polyalkyne backbone

and poly {[4-(((12-((4'-cyano-4-biphenylyl)oxy)dodecyl)oxy)carbonyl) phenyl]-acetylene} (PB12CN)

which has a fairly rigid poly (phenylacetylene )backbone

were synthesized using respectively WCl6 and [Rh(nbd)Cl]2 as the catalysts.PA8CN exhibits enantiotropic interdigitated smectic A phase (SAd) over a temperature range as wide as ca.100℃

whereas PB12CN is non-mesomorphic

demonstrating that the backbone rigidity plays an important role in determining the liquid crystallinity of the polyacetylenes.

Abstract

Two acetylene polymers containing cyanobiphenyl-based mesogens

poly { 10-[ ((4'- cyano-4-biphenylyl ) oxy ) carbonyl] - 1 -decyne } (PA8CN )

which has a relativelyfiexible polyalkyne backbone

and poly {[4-(((12-((4'-cyano-4-biphenylyl)oxy)dodecyl)oxy)carbonyl) phenyl]-acetylene} (PB12CN)

which has a fairly rigid poly (phenylacetylene )backbone

were synthesized using respectively WCl6 and [Rh(nbd)Cl]2 as the catalysts.PA8CN exhibits enantiotropic interdigitated smectic A phase (SAd) over a temperature range as wide as ca.100℃

whereas PB12CN is non-mesomorphic

demonstrating that the backbone rigidity plays an important role in determining the liquid crystallinity of the polyacetylenes.

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