Effects of off-state alignment in polymer dispersed liquid crystals

Margerum, J. D.; Lackner, A. M.; Ramos, Elena; Lim, K-C.; Smith, W. H.

doi:10.1080/02678298908027785

Cited by 41 publications

(16 citation statements)

References 8 publications

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“…PDLC films with ensemble of uniaxially oriented nematic liquid crystal (NLC) droplets were investigated in Ref. [2][3][4][5][6][7][8][9]. Strong anisotropy of scattering is the characteristic of such films [2,4,[6][7][8], allowing their use as light polarizers [2,4] and as optoelectronic elements with electrically controlled polarization characteristics [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Strong anisotropy of scattering is the characteristic of such films [2,4,[6][7][8], allowing their use as light polarizers [2,4] and as optoelectronic elements with electrically controlled polarization characteristics [7,8]. The uniform orientation of ellipsoidal nematic droplets is usually achieved by uniaxial stretching [2,4,7,9] or shearing [3,5,8] The light scattering from anisotropic nematic gels was investigated also [1,10]. In such gels a cross-linked anisotropic polymer network is formed in the homogeneous oriented NLC layer.…”

Section: Introductionmentioning

confidence: 99%

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Light Polarizer Based on Anisotropic Nematic Gel With Electrically Controlled Anisotropy of Scattering

Presnyakov

Galstian

2004

Molecular Crystals and Liquid Crystals

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Light Polarizer Based on Anisotropic Nematic Gel With Electrically Controlled Anisotropy of Scattering

Presnyakov

Galstian

2004

Molecular Crystals and Liquid Crystals

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“…Devices of this type can have either just one polarizer [5,6,11] or no polarizer at all [12]. Figure 1 liquid crystals (PDLCs) [1][2][3][4] has made it possible to introduce a new electro-optical material based on illustrates schematically a single-polarizer PDFLC cell. ferroelectric liquid crystals (FLCs) [5][6][7] and oOE ering a combination of the known advantage s of composite lms [8,9] with the rapid response inherent in chiral smectics.…”

Section: Introductionmentioning

confidence: 99%

Light modulation characteristics of a single-polarizer electro-optical cell based on polymer dispersed ferroelectric liquid crystals

Zyryanov¹,

Pozhidaev²,

Smorgon³

et al. 2001

Liquid Crystals

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Features of the light passing through a single-polarizer electro-optical cell based on a uniaxially oriented lm of a polymer dispersed ferroelectric liquid crystal have been studied. The optical response as a function of the applied electric eld is shown to depend on the cell geometry. A detailed analysis is presented of the dependence of the maximum light transmission, modulation depth and contrast ratio on the angle between the light polarization and the lm orientation direction, on its optical anisotropy and on the molecular tilt angle. An approximate formula is proposed to estimate the highest attainable contrast. Parameters under study have been measured for PDFLC lms varying in optical anisotropy value. The experimental results prove to be in good agreement with theoretical estimations.

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“…The basic step in the preparation of such composite films is the phase separation in which the microdroplets of the insoluble phase are generated in the polymer matrix. The most frequently used method is the photopolymerizationinduced phase separation [1][2][3][4]. When the molecular weight increases during curing, the microdroplets are produced as a result of a sharp decrease of solubility.…”

Section: Introductionmentioning

confidence: 99%

Rheological Behavior during Phase Separation Induced by UV Curing

Nam

Sakai

Otsubo

2002

Journal of the Society of Materials Science, Japan

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Abstract:The rheological changes during UV curing are examined for solutions of UV-reactive acrylic prepolymer and alkyd resin. To measure the dynamic viscoelasticity in the entire process of UV curing by a single run, a rheological program is developed, by which the storage modulus can be detected in the range of 100-108Pa under linear conditions.The solutions containing alkyd resin at concentrations of 10-30wt% show phase separation in the course of curing. The storage modulus of such systems rapidly increases at first, goes through a maximum and then decreasingly approaches the equilibrium value. The microscopic observation of cured films clearly indicates that the droplets generated by phase separation can grow and migrate in the three-dimensional network.The growth of droplets accompanies the rupture of continuous network in a narrow range. The delicate balance between the local rupture of network by phase separation and formation of crosslinks by polymerization controls the appearance of peak in the time-dependent curve of storage modulus.

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Effects of off-state alignment in polymer dispersed liquid crystals

Cited by 41 publications

References 8 publications

Light Polarizer Based on Anisotropic Nematic Gel With Electrically Controlled Anisotropy of Scattering

Light Polarizer Based on Anisotropic Nematic Gel With Electrically Controlled Anisotropy of Scattering

Light modulation characteristics of a single-polarizer electro-optical cell based on polymer dispersed ferroelectric liquid crystals

Rheological Behavior during Phase Separation Induced by UV Curing

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