Morphology of epoxy/acrylic polymer-dispersed liquid-crystal film in DICY thermal cure

Chin, Wei‐Kuo; Hsin, Lung-Pin; Lu, Hsin-Lung; Shau, Min‐Da

doi:10.1002/1099-0488(20000801)38:15<2033::aid-polb80>3.0.co;2-h

Cited by 10 publications

(7 citation statements)

References 20 publications

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“…Figure 8 shows the light transmissions of these PDLC films after thermal curing at 130°C/90 min at various voltages. When the pre-UV-cured film was stored at 60°C, at which temperature the LC and epoxy were in a miscible state as shown in the previous article, 8 the PDLC film expressed better electro-optical properties, including a higher contrast ratio (CR) and a lower switching voltage. Therefore, in the subsequent experiments this condition was selected for preparing the PDLC film.…”

Section: Electro-optical Propertiessupporting

confidence: 78%

“…In our previous article, 8 the miscibility of raw materials and morphologies of PDLC films was studied. In this article, the physical structures and electro-optical properties of the same system were discussed.…”

Section: Discussionmentioning

confidence: 76%

“…1 When the LC content exceeded 20 wt %, LC was segregated to form droplet morphology in the PDLC film as described in the previous article. 8 In this case, the PDLC was a composite of LC droplets embedded within the polymer matrix. A voltage field applied to a heterogeneous structure creates Maxwell-Wagner space charges around the heterogeneous sites.…”

Section: Tsc Investigationsmentioning

confidence: 99%

“…Because there was a significant weight loss of E63 if the treatment temperature was higher than 150°C, 130°C was selected for the thermal curing as mentioned in the previous article. 8 In this situation, the etherification reaction could be neglected. As for the major exothermal peak temperature and the reaction enthalpy shown in Figure 5, on the basis of the same amount of epoxy (DER736), they increased and decreased with the LC content, respectively.…”

Section: Tsc Investigationsmentioning

confidence: 99%

“…There was no obvious change in the droplet morphology as we continued to cure the sample after 90 min, as shown in the previous article. 8 Therefore, the T off remained unchanged after a 90-min cure. With the equivalent DER 736/DICY molar ratio increased from 1/0.6 to 1/1, the T off and T on proportionally decreased.…”

Section: Electro-optical Propertiesmentioning

confidence: 99%

See 4 more Smart Citations

TSC study and electro-optical properties of epoxy/acrylic polymer-dispersed liquid-crystal film in DICY thermal cure

Hsin

Chin

2001

J. Polym. Sci. B Polym. Phys.

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Section: Electro-optical Propertiessupporting

confidence: 78%

Section: Discussionmentioning

confidence: 76%

Section: Tsc Investigationsmentioning

confidence: 99%

Section: Tsc Investigationsmentioning

confidence: 99%

Section: Electro-optical Propertiesmentioning

confidence: 99%

See 3 more Smart Citations

TSC study and electro-optical properties of epoxy/acrylic polymer-dispersed liquid-crystal film in DICY thermal cure

Hsin

Chin

2001

J. Polym. Sci. B Polym. Phys.

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Preparation and characterization of PDLC films formed using a two‐step procedure

et al. 2007

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ABSTRACT:A novel polymer-dispersed liquid crystal composite film was prepared using liquid crystal and dual resins, namely, UV-curable urethane diacrylate and thermo-curable epoxy, with a fixed LC content of 50 wt%. A combination treatment of UV irradiation and heat was performed in sequential steps. At first, the urethane diacrylate resin was cross-linked through UV irradiation and a pre-UV-cured film was formed. Then, the pre-UV-cured film was heat treated for curing the thermo-curable epoxy resin. As the thermal polymerization continued, LC droplets were formed and became embedded POLYMER-DISPERSED LIQUID CRYSTAL COMPOSITE FILMSwithin the polymer matrix. PDLC films obtained from the polymer matrix with refractive indices in a range from 1.511 to 1.523 (1.517 ± 0.006) have optimal electro-optical properties. Films with a refractive index higher than 1.523 have high contrast ratio (CR), threshold voltage (V th ), and V 90 , whereas those with a low refractive index of 1.508 have low CR, V th , and V 90 . In this study, we found that PDLC composite films with optimal compositions prepared by dual resins (UV/thermal) have good electro-optical properties.

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Polymer dispersed liquid crystals based on poly(styrene‐b‐ethylene oxide), poly(bisphenol a carbonate) or poly(methylphenylsiloxane), and 4′‐(hexyloxy)‐4‐biphenyl‐carbonitrile: Analysis of phase diagrams and morphologies generated

Tercjak

Serrano

Larrañaga

et al. 2008

J of Applied Polymer Sci

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Thermodynamic phase behavior was studied for polymer dispersed liquid crystal (PDLC) films consisting of blends of different thermoplastics such as poly (bisphenol A carbonate) (PC), poly(methylphenylsiloxane) (PMPLSi), poly(styrene-b-ethylene oxide) (PSEO) block copolymer, and low-molecular weight 4 0 -(hexyloxy)-4-biphenyl-carbonitrile (HOBC) liquid crystals. The phase diagrams of these PDLC systems were built up using thermal transitions determined by differential scanning calorimetry (DSC), transmission optical microscopy (TOM), and dynamic mechanical analysis (DMA). Final morphology of these PDLC films generated by temperature induced phase separation was monitored by TOM. The final morphology of HOBC blends with PC, PSEO, or PMPLSi could be modified by controlling the relative compositions resulting in PDLC systems with small and narrow size-distribution of nematic droplets, suitable for use in thermo-optical devices.

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Morphology of epoxy/acrylic polymer-dispersed liquid-crystal film in DICY thermal cure

Cited by 10 publications

References 20 publications

TSC study and electro-optical properties of epoxy/acrylic polymer-dispersed liquid-crystal film in DICY thermal cure

TSC study and electro-optical properties of epoxy/acrylic polymer-dispersed liquid-crystal film in DICY thermal cure

Preparation and characterization of PDLC films formed using a two‐step procedure

Polymer dispersed liquid crystals based on poly(styrene‐b‐ethylene oxide), poly(bisphenol a carbonate) or poly(methylphenylsiloxane), and 4′‐(hexyloxy)‐4‐biphenyl‐carbonitrile: Analysis of phase diagrams and morphologies generated

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