Microphase stabilized ferroelectric liquid crystals

Details Microphase stabilized ferroelectric liquid crystals Microphase stabilized ferroelectric liquid crystals

C - Chemistry, Metallurgy

09

K

C09K 19/02 (2006.01) C09K 19/38 (2006.01) C09K 19/40 (2006.01)

Patent

CA 2316271

A microphase stabilized ferroelectric liquid crystal (MSFLC) and optical device prepared therefrom are provided. The MSFLC includes a block copolymer, comprising at least one non-liquid crystal polymer block and at least one liquid crystalline polymer block including a chiral mesogenic side group, the block copolymer comprising domains of the non-liquid crystalline block of the non-liquid crystalline polymer and domains of chiral mesogenic polymer such that the domains form an inverted cylinder morphology. The volume percent and block size of the chiral mesogenic group are selected such that the spacings between cylinders is sufficient to permit switching of the chiral mesogenic group between two stable orientations.

L'invention se rapporte à un cristal liquide ferroélectrique stabilisé en microphase (MSFLC) et à un dispositif optique comportant un tel cristal. Ce cristal MSFLC comporte un copolymère séquencé comprenant au moins une séquence de polymère cristal non liquide et au moins une séquence de polymère cristallin liquide incluant un groupe latéral, mésogène, chiral. Ledit copolymère séquencé comporte des domaines de la séquence cristalline non liquide du polymère cristallin non liquide et des domaines du polymère mésogène, chiral, de telle sorte que ces domaines forment une structure cylindrique inversée. Le pourcentage volumique et la taille de séquence du groupe mésogène chiral sont sélectionnés de sorte que les espacements entre les cylindres soient suffisants pour permettre le passage du groupe mésogène chiral d'une orientation stable à une autre orientation stable.

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