Phase transitions and separations in a distorted liquid crystalline mixture

Kasch, Nicholas; Dierking, Ingo

doi:10.1063/1.4928388

Cited by 7 publications

(4 citation statements)

References 34 publications

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“…Hybrid films based on polymer and liquid crystalline materials are at the present time wide experimentally and theoretically investigated towards use in various of flexible devices [1,2,3,4,5,6,7,8,9,10,11,12]. Films and fibres are made with an attempt to build light emitting diodes, transistors or solar cells [13,14,15,16,17,18,19,20,21].…”

Section: Introductionmentioning

confidence: 99%

Dielectric, Thermal and Mechanical Properties of l,d-Poly(Lactic Acid) Modified by 4′-Pentyl-4-Biphenylcarbonitrile and Single Walled Carbon Nanotube

et al. 2019

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We report here the preparation and thermal, electrical and mechanical characterization of binary and ternary films based on l,d-poly(lactic acid) (l,d-PLA) and 4′-pentyl-4-biphenylcarbonitrile (5CB) and Single Walled Carbon Nanotubes (SWCN) with various weight ratio. The transitions for all investigated hybrid compositions detected by differential scanning calorimetry method were shifted to lower temperatures with increasing the concentration of 5CB in the mixture with polymer. Frequency domain dielectric spectroscopy method and thermal imaging together with polarized optical microscope were used to study electric and structural properties of created hybrid compositions. The best electrical conductivity was observed for hybrid composite l,d-PLA:5CB:SWCN with ratio 10:1:0.5 w/w/w - resistance of 41.0 Ω and thermal response up to 160 °C without causing any damages. Films in crystal form are much more inflexible than in amorphous and can be explain by the cold crystallization occurs at heating while the materials changed their physical state. The value of ε′ increases with increasing the 5CB admixture. Moreover, the addition of 5CB to l,d-PLA resulted in increased flexibility of polymeric base films. The best material flexibility and short-term strength were obtained for l,d-PLA sample with 9% 5CB content.

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Section: Introductionmentioning

confidence: 99%

Dielectric, Thermal and Mechanical Properties of l,d-Poly(Lactic Acid) Modified by 4′-Pentyl-4-Biphenylcarbonitrile and Single Walled Carbon Nanotube

et al. 2019

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“…The liquid crystal used in these experiments was a mixture of 5CB, which contains nonreactive mesogens and RM257, serving as the reactive monomer at 20 wt/wt % (see Supporting Information , Figure S1). Multicomponent liquid crystals are commonly used to tailor their properties, 52 such as clearing point. In the following experiments, 5CB and RM257 mixtures are treated as one single component of a binary mixture.…”

Section: Results and Discussionmentioning

confidence: 99%

Liquid Crystal-Templated Porous Microparticles via Photopolymerization of Temperature-Induced Droplets in a Binary Liquid Mixture

et al. 2023

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Porous polymeric microspheres are an emerging class of materials, offering stimuli-responsive cargo uptake and release. Herein, we describe a new approach to fabricate porous microspheres based on temperature-induced droplet formation and light-induced polymerization. Microparticles were prepared by exploiting the partial miscibility of a thermotropic liquid crystal (LC) mixture composed of 4-cyano-4′-pentylbiphenyl (5CB, unreactive mesogens) with 2-methyl-1,4-phenylene bis4-[3-(acryloyloxy)propoxy] benzoate (RM257, reactive mesogens) in methanol (MeOH). Isotropic 5CB/RM257-rich droplets were generated by cooling below the binodal curve (20 °C), and the isotropic-to-nematic transition occurred after cooling below 0 °C. The resulting 5CB/RM257-rich droplets with radial configuration were subsequently polymerized under UV light, resulting in nematic microparticles. Upon heating the mixture, the 5CB mesogens underwent a nematic–isotropic transition and eventually became homogeneous with MeOH, while the polymerized RM257 preserved its radial configuration. Repeated cycles of cooling and heating resulted in swelling and shrinking of the porous microparticles. The use of a reversible materials templating approach to obtain porous microparticles provides new insights into binary liquid manipulation and potential for microparticle production.

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“…S1). Multicomponent liquid crystals are commonly used to tailor their properties, 44 such as clearing point. In the following experiments, 5CB and RM257 mixtures are treated as one single component of a binary mixture.…”

Section: Resultsmentioning

confidence: 99%

Liquid Crystal-Templated Porous Microparticles via Photopolymerisation of Temperature-Induced Droplets in a Binary Liquid Mixture

Patel

Álvarez-Fernández

Fornerod

et al. 2022

Preprint

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Porous polymeric microspheres are an emerging class of materials, offering stimuli-responsive cargo uptake and release. Herein, we describe a new approach to fabricate porous anisotropic microspheres based on temperature-induced droplet formation and light-induced polymerisation. Anisotropic liquid crystal (LC) microparticles were prepared by exploiting the partial miscibility of a thermotropic LC mixture composed of 4-cyano-4’- pentylbiphenyl (5CB, unreactive mesogens) with 2-methyl- 1,4-phenylene bis4-[3-(acryloyloxy)propoxy] benzoate (RM257, reactive mesogens) in methanol (MeOH). Isotropic 5CB/RM257-rich droplets were generated by cooling below the binodal curve (20°C), and the isotropic-to-nematic transition occurred after cooling below 0°C. The resulting 5CB/RM257-rich droplets with radial configuration were subsequently polymerised under UV light, resulting in nematic microparticles. Upon heating the mixture, the 5CB mesogens underwent a nematic-isotropic transition and eventually became homogeneous with MeOH, while the polymerised RM257 preserved its radial configuration. Repeated cycles of cooling and heating resulted in swelling and shrinking of the porous microparticles. The use of a reversible materials templating approach to obtain porous microparticles provides new insights into binary liquid manipulation and potential for microparticle production.

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Phase transitions and separations in a distorted liquid crystalline mixture

Cited by 7 publications

References 34 publications

Dielectric, Thermal and Mechanical Properties of l,d-Poly(Lactic Acid) Modified by 4′-Pentyl-4-Biphenylcarbonitrile and Single Walled Carbon Nanotube

Dielectric, Thermal and Mechanical Properties of l,d-Poly(Lactic Acid) Modified by 4′-Pentyl-4-Biphenylcarbonitrile and Single Walled Carbon Nanotube

Liquid Crystal-Templated Porous Microparticles via Photopolymerization of Temperature-Induced Droplets in a Binary Liquid Mixture

Liquid Crystal-Templated Porous Microparticles via Photopolymerisation of Temperature-Induced Droplets in a Binary Liquid Mixture

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