Azobenzene-containing liquid crystalline polyester with π–π interactions: diverse thermo- and photo-responsive behaviours

Abstract

An azobenzene-containing thermotropic liquid crystalline polyester showing unique thermo- and photo-responsive behaviours was synthesized.

Photomobile Polymer Materials with Complex 3D Deformation, Continuous Motions, Self‐Regulation, and Enhanced Processability

“…Although some of these polymers were reported to show no LC phases, the photoisomerization of azobenzene moieties triggered bending and oscillation of the films. Main‐chain LCPs with polyurethane and polyester backbones were also reported to show photomechanical properties.…”

Physio- and chemo-dual crosslinking toward thermoand photo-response of azobenzene-containing liquid crystalline polyester

“…In our previous work [36,37], the azobenzene based main-chain liquid crystalline polyester PBHPS showed heat-assisted healing behavior due to the π-π interaction in the chain as the physical crosslink. When crosslinker PTA is introducd into PBHPS to form some slight chemical crosslink, would the chemical crosslink influence the healing behaviors?…”

“…The monomers, including 4,4ʹ-dihydroxyazobenzene (DHAB) and 4,4ʹ-bis(6-hydroxyhexyloxy)azobenzene (BHHAB) were prepared following the procedure reported in the literature [36,41]. All the polyesters were prepared following the same procedure.…”

“…Chen et al [32] synthesized a side-chain LCP which showed good thermal shape memory property with the polymer chain columns acting like physical crosslinks. In our previous studies [33][34][35][36][37][38], two main-chain LCPs with inter-/intra-molecular π-π interaction as crosslinking points were designed and synthesized, and the resulting good shape memory behaviors proved that the π-π interaction could also be an effective modes to build stimuli responsive CLCPs. In summary, physical crosslinking can solve the processibility effectively caused by chemical crosslinking, but these weak intermolecular interactions may be influenced easily by the movement of the polymer chains in some conditions, which also restricted the application of materials.…”

Cocrystals in Systems with Alkyloxybenzoic Acids: Formation Tendencies

“…Использование соединений с группами атомов, способными к образованию специфических межмолекулярных связей, весьма перспективно при разработке жидкокристаллических (ЖК) материалов с прогнозируемым комплексом свойств [2]. За счет изменения совокупности слабых направленных взаимодействий разных типов, участвующих в формировании надмолекулярных архитектур, образуются соединения с новыми электрофизическими и мезоморфными свойствами [3][4][5][6][7][8][9][10] с сохранением общей анизотропии супрамолекулярных ансамблей. В настоящее время п-н-алкилоксибензойные кислоты (ОБК) являются востребованными прекурсорами для получения новых жидкокристаллических материалов [11][12][13][14][15].…”