Supramolecular main-chain liquid crystalline polymers and networks with competitive hydrogen bonding: a study of increased flexibility on distonic mesogenic hydrogen bond acceptors with networks created fromtetrakis-, tris- andbis-functionalised pyridyl networking agents

Supramolecular main-chain liquid crystalline polymers and networks with competitive hydrogen bonding: a study of flexible bis-acids and a mixture of rigid and flexible polypyridyls

“…One reason that the networks described here retained mesogenic character at such higher concentrations could be the increased flexibility of the 5EOBBA hydrogen bond donor over the 4EOBBA -the increased mobility of the accep tor groups would provide a mesogen that could be more 'forgiving' of localised structural defects that could destroy mesogenicity, such as being tethered to a non-mesogenic agent, that is, the nPD molecules. This is consistent with observations noted in sys tems containing mesogen-forming bispyridyls with increased flexibility (39). It was interesting to note that triethyleneglycoxy bis-4-benzoic acid (3EOBBA) produced complexes that melted too high to form mesogenic associative chain structures.…”

“…Previous work (36)(37)(38)(39) in our laboratory involved a flexible bis-acid and mixtures of a rigid bi-pyridyl and a non-mesogenic tetrapyridyl species. These produced supramolecular networks with variable liquid crys talline characteristics.…”

Supramolecular main-chain liquid crystalline polymers and networks with competitive hydrogen bonding: a study of rigid networking agents in supramolecular systems

“…Previous work [36][37][38][39][40] in our laboratory involved a flexible bisacid and mixtures of a rigid bi-pyridyl and a non-mesogenic tetrapyridyl species. These produced supramolecular networks with variable liquid crystalline characteristics.…”