The effects of thermally induced diffusion of dye on the broadband reflection performance of cholesteric liquid crystals films

Wang, Feifei; Li, Kexuan; Song, Ping; Wu, Xiaojuan; Chen, Hangping; Cao, Hui

doi:10.1016/j.compositesb.2012.10.005

Cited by 16 publications

(8 citation statements)

References 39 publications

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“…The temperature dependence of the helical pitch was also found in other cholesteric LC systems. 36,37 When the temperature reached 95 1C, which exceeded T i , the visual field became completely dark, and the LC phase completely disappeared (Fig. 2e), implying that 2CTPE molecules reached the isotropic state.…”

Section: Liquid Crystalline Featuresmentioning

confidence: 98%

Thermally tunable circular dichroism and circularly polarized luminescence of tetraphenylethene with two cholesterol pendants

Zhu

Zhang

et al. 2015

J. Mater. Chem. C

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Section: Liquid Crystalline Featuresmentioning

confidence: 98%

Thermally tunable circular dichroism and circularly polarized luminescence of tetraphenylethene with two cholesterol pendants

Zhu

Zhang

et al. 2015

J. Mater. Chem. C

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“…34,35 As a comparison, the homogeneous (Hs) alignment of mesogens (orientational direction parallel to the lm surface) was also achieved by rubbing the substrate coated with a PVA layer in a unidirectional way. 36,37 The alignment was veried by using POM. As shown in Fig.…”

Section: Microphase Separation Morphologymentioning

confidence: 99%

Synthesis, nanostructures and dielectric properties of novel liquid crystalline block copolymers

et al. 2014

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International audienceIn this work, a series of diblock copolymers with a defined length of a soft poly(dimethylsiloxane) (PDMS) segment and different lengths of liquid crystalline (LC) poly[11-(4-cyano-4'-biphenoxy)undecyl methacrylate] (P11CBMA) segments were synthesized by using the atom transfer radical polymerization (ATRP) method. Their microphase separation behavior and dielectric properties were carefully investigated. The well-defined diblock copolymers PDMSm-b-P11CBMA(n) possess three different soft/rigid ratios (m = 62, n = 15, 22, and 40) and narrow molecular distributions (PDI <= 1.25). Due to the supramolecular cooperative motion effect, the copolymers can form lamellar morphology (W-LC = 57.8%), predominant lamellar morphology with PDMS cylindrical defects (W-LC = 66.8%), and PDMS cylinders embedded in the LC matrix (W-LC = 78.3%) after annealing at 160 degrees C (above T-i) under N-2 for 24 h, respectively. The dielectric properties of the block copolymers were strongly influenced by the microphase separated morphologies and orientational directions of mesogens. Compared to homopolymer P11CBMA, PDMSm-b-P11CBMA(n) showed higher dielectric constants due to the confinement effect of microdomain dimensions. The dielectric constants of diblock copolymers could be further improved by aligning mesogens parallel to the electric field through substrate treatments. These findings will inspire researchers to design and develop novel LC block copolymers for dielectric elastomer actuator applications

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“…These properties led to a range of CLC materials that are responsive to various stimuli (e.g. light, electric field, or temperature) and change properties such as reflectivity or surface topography . For the fabrication of stimulus‐responsive LC polymer films, both polymer liquid crystalline elastomers and glassy networks have been used …”

Section: Introductionmentioning

confidence: 99%

Easily Processable and Programmable Responsive Semi‐Interpenetrating Liquid Crystalline Polymer Network Coatings with Changing Reflectivities and Surface Topographies

Kragt

Broer

Schenning

2017

Adv Funct Materials

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The fabrication of stimulus-responsive coatings that change both reflectivity and topography is hampered by the lack of easy processable, patternable, and programmable elastomers. Here, an easily applied reflective coating based on a semi-interpenetrating polymer network composed of a liquid crystal elastomer and a liquid crystal network (>15 wt%) is reported. The reflective wavelength of these polysiloxane elastomer photonic coatings can be readily programed by the concentration of chiral reactive mesogen dopant that forms the network. The coatings show a fast and reversible decrease in reflection band intensity with increasing temperature, which can be tuned by the polymer network density. In addition, hierarchical surface relief structures are prepared, which can be reversibly changed with temperature.

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The effects of thermally induced diffusion of dye on the broadband reflection performance of cholesteric liquid crystals films

Cited by 16 publications

References 39 publications

Thermally tunable circular dichroism and circularly polarized luminescence of tetraphenylethene with two cholesterol pendants

Thermally tunable circular dichroism and circularly polarized luminescence of tetraphenylethene with two cholesterol pendants

Synthesis, nanostructures and dielectric properties of novel liquid crystalline block copolymers

Easily Processable and Programmable Responsive Semi‐Interpenetrating Liquid Crystalline Polymer Network Coatings with Changing Reflectivities and Surface Topographies

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