Design of zero–zero‐birefringence polymers in methacrylate copolymer systems containing trichloroethyl methacrylate

Iwasaki, Shuhei; Satoh, Zen; Shafiee, Houran; Tagaya, Akihiro; Koike, Yasuhiro

doi:10.1002/app.39136

Cited by 14 publications

(18 citation statements)

References 10 publications

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“…The refractive indices of a polymer depend on the change in polarizability when its molecular chains are stretched or compressed by bending strain [9]- [12]. Generally, when a plastic substrate is in a curved state, the inner surface of the substrate has compressive stress, and the upper surface has tensile stress.…”

Section: Change In Phase Retardation Of Polycarbonate Substrates By Tmentioning

confidence: 99%

Evaluation of Phase Retardation of Curved Thin Polycarbonate Substrates for Wide-viewing Angle Flexible Liquid Crystal Displays

Honda

Ishinabe

Shibata

et al. 2017

IEICE Trans. Electron.

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SUMMARYWe investigated the effects of a bending stress on the change in phase retardation of curved polycarbonate substrates and optical characteristics of flexible liquid crystal displays (LCDs). We clarified that the change in phase retardation was extremely small even for the substrates with a small radius of curvature, because bending stresses occurred in the inner and upper surfaces are canceled each other out. We compensated for the phase retardation of polycarbonate substrates by a positive C-plate and successfully suppressed light leakage in both non-curved and curved states. These results indicate the feasibility of high-quality flexible LCDs using polycarbonate substrates even in curved states.

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Section: Change In Phase Retardation Of Polycarbonate Substrates By Tmentioning

confidence: 99%

Evaluation of Phase Retardation of Curved Thin Polycarbonate Substrates for Wide-viewing Angle Flexible Liquid Crystal Displays

Honda

Ishinabe

Shibata

et al. 2017

IEICE Trans. Electron.

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“…The resulting polymer films were cut into dumbbell-shaped specimens. The procedure was almost the same as that described in the reference works [7][8][9].…”

Section: B Preparation Of Polymer Samplesmentioning

confidence: 99%

“…Therefore, to eliminate birefringence, control of both the intrinsic birefringence and the photoelastic coefficient is essential. Tagaya et al proposed a zero-zero-birefringence polymer that exhibits neither orientational birefringence nor photoelastic birefringence [5][6][7][8][9]. In their research, a random copolymerization method was proposed for compensating for birefringence [5].…”

Section: Introductionmentioning

confidence: 99%

“…However, other properties are also needed to meet the requirements of practical use, such as transparency and mechanical and thermal properties. We have proposed the replacement of the constituents of the copolymerization system and an increase in the number of constituents [7,8]. An increase in the number of constituents enables the design of zero-zero-birefringence polymers with multiple compositions.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of optical and thermal properties of N-(alkyl-substituted) maleimides for use in zero–zero-birefringence polymer

et al. 2015

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N-(alkyl-substituted) maleimides (RMIs) were proposed as materials useful for the development of a zero-zero-birefringence polymer that exhibits no birefringence. We analyzed the optical and thermal properties of poly(RMI)s, such as the refractive index, birefringence, and glass transition temperature. The characteristics of the obtained polymers varied significantly because the shift of the density and polarizability derived from the change of the substituent structure influenced the optical properties, and the bulkiness of the substituents influenced the thermal properties. We also designed a zero-zero-birefringence polymer using N-ethyl maleimide (EMI) as a comonomer, and the obtained copolymer had no birefringence, relatively high heat resistance, and high transparency.

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“…– , with the condition

Δ n ° = C = 0

Δ n ° = Δ n °_{1} \times \frac{w_{1}}{100} + Δ n °_{2} \times \frac{w_{2}}{100} + Δ n °_{3} \times \frac{w_{3}}{100} + \cdot \cdot \cdot + Δ n °_{i} \times \frac{w_{i}}{100}

C = C_{1} \times \frac{w_{1}}{100} + C_{2} \times \frac{w_{2}}{100} + C_{3} \times \frac{w_{3}}{100} + \cdot \cdot \cdot + C_{i} \times \frac{w_{i}}{100}

w_{1} + w_{2} + w_{3} + \cdot \cdot \cdot + w_{i} = 100

where

Δ n °

C_{i}

w_{i}

are the intrinsic birefringence, photoelastic coefficient, and weight fraction of the i th polymer ( i = 1, 2, 3, …), respectively. Some zero–zero‐birefringence polymers have been designed and synthesized by ternary and quaternary copolymerization systems . Therefore, the effectiveness of the method for designing the zero–zero‐birefringence polymer has been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of orientational and photoelastic birefringence generation of methacrylates for the design of zero–zero‐birefringence polymers

Shafiee

Beppu

Iwasaki

et al. 2015

Polymer Engineering & Sci

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The intrinsic birefringence Dn 0 and photoelastic coefficient C of poly(methyl methacrylate), poly(2,2,2-trifluroethyl methacrylate), poly(phenyl methacrylate), and poly(2,2,3,3,3-pentafluorophenyl methacrylate) were determined. We categorized these methacrylate polymers into four birefringence-types, even though their molecular structures differed only by the substituents on the side chains. Based on the results of Dn 0 and C, novel polymers that exhibit neither orientational nor photoelastic birefringence, i.e., zero-zero-birefringence polymers, were designed and synthesized by quaternary copolymerization system. Furthermore, we confirmed that the mechanisms of orientational birefringence and photoelastic birefringence generation were different in these methacrylate polymers. The conformation of the repeat unit of the polymers was nearly constant during the generation of orientational birefringence. In contrast, the conformation of the repeat unit of the polymers changed during the generation of photoelastic birefringence in the glassy state. These findings demonstrated the reasonability of evaluating orientational and photoelastic birefringence separately, as well as the adequacy of the classification of polymers into four birefringence-types. Given these results and the fact that zero-zero-birefringence polymers could be prepared successfully by four-birefringence type monomers, we demonstrated the reasonability of the method for designing the zero-zero-birefringence polymers. POLYM. ENG. SCI., 55:1330SCI., 55: -1338SCI., 55: , 2015

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Design of zero–zero‐birefringence polymers in methacrylate copolymer systems containing trichloroethyl methacrylate

Cited by 14 publications

References 10 publications

Evaluation of Phase Retardation of Curved Thin Polycarbonate Substrates for Wide-viewing Angle Flexible Liquid Crystal Displays

Evaluation of Phase Retardation of Curved Thin Polycarbonate Substrates for Wide-viewing Angle Flexible Liquid Crystal Displays

Investigation of optical and thermal properties of N-(alkyl-substituted) maleimides for use in zero–zero-birefringence polymer

Mechanisms of orientational and photoelastic birefringence generation of methacrylates for the design of zero–zero‐birefringence polymers

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