Thermodynamic and structure investigations of new side-chain liquid crystal polymer

A. Danch; Peter Laggner; G. Degovics; D. Sek; F. Stelzer

doi:10.1117/12.301300

1 January 1998 Thermodynamic and structure investigations of new side-chain liquid crystal polymer

A. Danch, Peter Laggner, G. Degovics, D. Sek, F. Stelzer

Proceedings Volume 3319, Liquid Crystals: Chemistry and Structure; (1998) https://doi.org/10.1117/12.301300
Event: Liquid Crystals, 1997, Zakopane, Poland

Abstract

Bis [((omega) -(4'-cyanobiphenyl)-4-yl)oxy-n- alkyl]norborn-5-ene-2,3-dicarboxylate was polymerized via ring opening metathesis polymerization. Two distributed polynorbornene derivatives, both of cis configuration, with different length of side-chain were studied. The influence of thermal history on the smectic phase stabilization, position and shape of the glass transition with temperature and on the relaxation process is shown. Glass transition temperatures enthalpies of isotropization and average layer spacing were calculated. Although, the rather flexible spacer between the mesogenic group and the main chain seems to be sufficient to partially decouple the mobility of the main chain from that of the mesogenic group, the influence of a backbone chain structure is still significant for polymer properties, especially in bulk. The measured layer spacing doe not correspond to double length of the side chain which suggests that either the side chains are not fully extended or some overlapping of CN tails occurs.

Citation Download Citation

A. Danch, Peter Laggner, G. Degovics, D. Sek, and F. Stelzer "Thermodynamic and structure investigations of new side-chain liquid crystal polymer", Proc. SPIE 3319, Liquid Crystals: Chemistry and Structure, (1 January 1998); https://doi.org/10.1117/12.301300

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