Synthesis and thermotropic properties of new polyacrylates containing alkanoyl-substituted azobenzene mesogens

Giancarlo Galli, Emo Chiellini, Michele Laus, Sante A. Angeloni, Daniele Caretti, Enzo Fanelli, Giovanni Poeti, Bernard Gallot

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

The synthesis and characterization of a series of new polyacrylates 1, containing the azobenzene mesogen spaced from the backbone by a hexamethylene segment and substituted in the 4-position by an alkanoyl chain of variable length, together with those of the relevant precursors are reported. Optical and X-ray analyses provided evidence for the presence of a smectic A mesophase in a fairly broad range of temperature in both polymers and low molar mass compounds. In polyacrylates 1, the side-chain substituents were fully interdigitated in a smectic A1 structure. The comparison of the transition parameters of polymers 1 with those of another series of polyacrylates 7 containing the azobenzene unit substituted in the 4-position by an alkyloxy chain of variable length revealed that the replacement of an oxygen atom by a carbonyl group strongly enhanced the smectogenic character of the azobenzene group.

Lingua originaleInglese
pagine (da-a)115-125
Numero di pagine11
RivistaLiquid Crystals
Volume16
Numero di pubblicazione1
DOI
Stato di pubblicazionePubblicato - gen 1994
Pubblicato esternamente

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