Authors: N I Boiko A I Lysachkov S A Ponomarenko V P Shibaev R M Richardson
Publish Date: 2005/04/22
Volume: 283, Issue: 11, Pages: 1155-1162
Abstract
A new series of carbosilane liquid crystalline LC dendrimers from the first to the third generations with 8 16 and 32 chiral terminal mesogenic groups respectively has been synthesized The molecular structures and purity of all new compounds were confirmed by 1H NMR spectroscopy and GPC analysis Data of polarization microscopy and SAX analysis demonstrated that all LC dendrimers synthesized form a chiral smectic SmC phase at temperatures below 50 °C It has been found that bistable electrooptical switching is observed for all dendrimers The influence of chiral mesogenic fragment length on phase behavior and ferroelectric properties of carbosilane LC dendrimers is discussedThis research was supported by the Research Program of “Russian Universities” Grant 0503043 and Russian Foundation of Fundamental Research Grant 040332439 We also acknowledge AM Muzafarof and EA Rebrov Institute of Synthetic Polymeric Materials in Moscow for synthesis of dendritic matrix with terminal allyl groups
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