Photo-induced isomerization of poly 4′-(6-acryloxy) hexyloxy-4-methoxyazobenzene ultra-thin solid film prepared by Langmuir–Blodgett technique

Petchsirivej, S.; Srikhirin, Toemsak; Bualek-Limcharoen, Sauvarop; Kasemjit, P.; Chantarachindawong, Rojcharin; Sutapun, Boonsong

doi:10.1016/j.cap.2007.04.004

Cited by 2 publications

(1 citation statement)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is virtually macroscopically disordered because each microdomain is oriented arbitrarily with respect to its neighbour domain. More recently, Petchsirivej et al [8] demonstrated that a macroscopically ordered monodomain lamellar phase could be prepared by LangmuirBlodgett horizontal deposition of a polyacrylatebased side-chain LCP with 4'-(6-acryloxy) hexyloxy-4-methoxyazobenzene as the side chain. In another way, Uekusa et al [9] assembled a monodomain lamellar * Corresponding author.…”

Section: Introductionmentioning

confidence: 98%

Photo-triggered assembly/disassembly of macroscopically ordered monodomain lamellar structure in side-chain liquid crystalline polymer containing strong polar azobenzene mesogens

Liu¹,

Wang²,

Li³

et al. 2011

Liquid Crystals

View full text Add to dashboard Cite

2011) Photo-triggered assembly/disassembly of macroscopically ordered monodomain lamellar structure in side-chain liquid crystalline polymer containing strong polar azobenzene mesogens, Liquid Crystals, 38:1, 105-113, Assembly of ordered structures by an external stimulus allows for design of functional materials with enhanced physical and chemical properties. A new side-chain liquid crystal polymer containing strong polar azobenzene mesogens was synthesised. A macroscopically ordered monodomain smectic-like lamellar structure having orientational order and positional order was immediately assembled by linear polarised light irradiation (473 nm, 20 mW/cm 2 ) at room temperature. The lamellar layer with its periodic d-spacing of 1.9 nm and mesogens arranged at an inclination angle of about 75 • were characterised by X-ray diffraction and polarising optical microscopy which showed a diffraction peak at 2θ = 4.53 • and an off-centred interference figure. Reversible assembly and disassembly of the lamellar phase were achieved by alternative irradiation with polarised light and non-polarised light. Potential factors influencing the assembly of the ordered lamellar structure were investigated by controlling the mesogens out-of-plane orientation and by changing the polarities of mesogens. The difference in arrangement of the mesogens between the lamellar phase and a thermotropic smectic phase was also compared by heating the selectively exposed film. The light controllable assembly of mesogens provides an easy route to assemble a lamellar phase in azobenzene containing polymers for application in optical and photonic devices.

show abstract

Section: Introductionmentioning

confidence: 98%