Compositions comprising functionalized polyvinyl alcohol and nanocapsules containing a liquid-crystalline medium
A technology of nanocapsules and liquid crystal media, which is applied in liquid crystal materials, microcapsule preparations, chemical instruments and methods, etc., to achieve the effect of reducing operating voltage, good mechanical stability, and reducing hysteresis
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[0408] In the example,
[0409] V o Indicates the threshold voltage at 20°C, capacitive [V],
[0410] no e denotes the extraordinary refractive index at 20 °C and 589 nm,
[0411] no o denotes the ordinary refractive index at 20°C and 589 nm,
[0412] Δn represents the optical anisotropy at 20°C and 589nm,
[0413] ε || denotes the permittivity parallel to the director at 20 °C and 1 kHz,
[0414] ε ⊥ denotes the permittivity perpendicular to the director at 20°C and 1kHz,
[0415] Δε denotes the dielectric anisotropy at 20 °C and 1 kHz,
[0416] cl.p.,T(N,I) means clearing point [°C],
[0417] gamma 1 Indicates the rotational viscosity [mPa·s] measured at 20°C measured by the rotational method in a magnetic field,
[0418] K 1 Indicates the elastic constant, "bending" deformation at 20°C [pN],
[0419] K 2Indicates the elastic constant, "torsional" deformation [pN] at 20°C,
[0420] K 3 Indicates the elastic constant, "bending" deformation [pN] at 20°C,
[0...
Embodiment 1
[0506] The concentrated nanocapsule sample prepared in Reference Example 1 was added to the adhesive formulation prepared in Reference Example 5, which contained the acrylate-modified PVA adhesive prepared in Synthesis Example 1. agent. The weight ratio of PVA to capsule is 60:40. Add photoinitiator Irgacure 2959 (2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone from Sigma-Aldrich) to the mixture (with respect to the weight of solid modified PVA polymer 5% by weight).
[0507] The mixture was then processed and measured as described in Comparative Example 2.
[0508] After measuring the electro-optic properties of the prepared films, broadband UV light (UVACUBE 2000, Dr. ) at 80mW / cm 2 and an exposure time of 3 min to cure the film.
[0509] The electro-optic parameters of the prepared films measured before and after curing with UV light are given in the table below.
[0510]
[0511]
[0512] Among other advantages, in particular improved dark states and redu...
Embodiment 2
[0514] The concentrated nanocapsule sample prepared in Reference Example 1 was added to the adhesive formulation prepared in Reference Example 5, which contained the acrylate-modified PVA adhesive prepared in Synthesis Example 1. agent. The weight ratio of PVA to capsule is 60:40. The photoinitiator TPO (2,4,6-trimethylbenzoyl-diphenylphosphine oxide from Sigma-Aldrich) was added to the mixture (5% by weight relative to the weight of the solid modified PVA polymer).
[0515] The mixture was then processed and measured as described in Comparative Example 2.
[0516] After measuring the electro-optic properties of the prepared films, broadband UV light (UVACUBE 2000, Dr. ) at 80mW / cm 2 and an exposure time of 30 sec to cure the film.
[0517] The electro-optic parameters of the prepared films measured before and after curing with UV light are given in the table below.
[0518]
[0519] Among other advantages, in particular improved dark states and reduced hysteresi...
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