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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Tomazos, Dimitris Percec, Virgil |
| Copyright Year | 1993 |
| Abstract | The synthesis and characterization of side-chain liquid-crystalline polysiloxanes based on 4′-cyanobiphenyl-4-yl 2-(2-allyloxyethoxy)-4-(4-methoxybenzyloxy)benzoate (11-1), 4′-cyanobiphenyl-4-yl 2-[2-(2-allyloxyethoxy) ethoxy]-4-(4-methoxybenzyloxy) benzoate (11-2) and 4′-cyanobiphenyl-4-yl 2-{2-[2-(2-allyloxyethoxy)ethoxy] ethoxy}-4-(4-methoxybenzyloxy)benzoate (11-3) side-on fixed mesogenic groups are presented. These polysiloxanes are the first examples of side-chain liquid-crystalline polymers containing oligooxyethylenic spacers and side-on fixed mesogenic groups. All the polysiloxanes synthesized display enantiotropic N mesophases. The complexation of the polysiloxane based on the monomer 11-3(i.e.12-3) with LiCF3SO3 resulted in an initial decrease and then a subsequent increase of the glass transition of the complexes, and in a decrease of the N–I transition temperature. These complexes are nematic liquid-crystalline polyelectrolytes up to a value of 0.4 mol LiCF3SO3 per mole repeat unit of polymer. Above this value, the N mesophase cannot form owing to its close proximity to the glass-transition temperature. |
| Starting Page | 643 |
| Ending Page | 650 |
| Page Count | 8 |
| File Format | |
| ISSN | 09599428 |
| Volume Number | 3 |
| Issue Number | 6 |
| Journal | Journal of Materials Chemistry |
| DOI | 10.1039/JM9930300643 |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Benzoic acid Silicone Monomer Glass transition Liquid crystal Polymer Mesophase |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Materials Chemistry |
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