Self-assembled bent-core side-chain liquid crystalline polymers

Chemical Communications

Volumn , Issue 11, 2006, Pages 1212-1214

  Barberá, Joaquín ^a   Gimeno, Nélida ^a   Pintre, Inmaculada ^a   Ros, M Blanca ^a   Serrano, José Luis ^a  

^a UNIVERSITY OF ZARAGOZA   (Spain)

Author keywords

[No Author keywords available]

Indexed keywords

POLYMER;

ARTICLE; CHEMICAL STRUCTURE; CRYSTAL STRUCTURE; HYDROGEN BOND; LIQUID CRYSTAL; PHYSICAL CHEMISTRY;

EID: 33644766063     PISSN: 13597345     EISSN: None     Source Type: Journal    
DOI: 10.1039/b516718c     Document Type: Article

References (29)

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21. The synthesis of the desired bent-complexes required the H donor and H acceptor to be mixed in precise equimolecular proportions in a common solvent (THF), followed by slow removal of the solvent. The formation and thermal stability of the complex was confirmed by IR spectroscopy (see ESI) and through OM measurements: the solid samples melted cleanly without the appearance of biphasic regions
22. In some cases, virgin semicrystalline samples of these polymers did not form mesophase on heating but all of them were mesomorphic on successive thermal treatments after they had first been melted to the isotopic liquid
23. The high viscosity of these polymers prevented cell filling by capillary action and so their electrooptic characterization was not possible
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25. To avoid premature thermal polymerization of the reactive complexes 200 ppm of a thermal inhibitor (2,6-di-tert-butyl-4-methylphenol) was added to the samples, but partial thermal polymerization of the complexes 1-M6, 2-M6 and 2-M11 was observed on heating, limiting any comparative study
26. The photopolymerization of 1-M11 was carried out using a photo-DSC experimental setup equipped with a 365 nm lamp and samples containing 1% (w/w) of Irgacure 369 and 200 ppm of the thermal inhibitor 2,6-di-tert-butyl-4- methylphenol. The liquid crystalline properties of the monomer were not noticeably modified for the blends
27. J. Barberá N. Gimeno L. Monreal R. Piñol M. B. Ros M. J. L. Serrano J. Am. Chem. Soc. 126 7190
28. Samples of 1-M11 were subjected to electric fields to ensure a ferroelectric SmCP order before polymerization. However, despite the proven switching of the monomer, as soon as a DC voltage was applied, the sample polymerized to give opaque films without SHG activity under a 1064 nm laser
29. J. Ortega J. A. Gallastegui C. L. Folcia J. Etxebarria N. Gimeno B. Ros Liq. Cryst. 31 579