Fourier transform infra-red study of uniaxially oriented poly(2,6-dimethyl 1,4-phenylene oxide)-atactic polystyrene blends

Lefebvre, Denis; Jasse, B.; Monnerie, L.

doi:10.1016/0032-3861(81)90374-8

Cited by 75 publications

(47 citation statements)

References 11 publications

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“…21 Therefore, these results show that the birefringence dispersion of the PS/PPO films changes depending on the stretching parameters. Our experimental results are also supported by those of Lefebvre et al, 28 who reported similar results for PS/PPO films. Furthermore, our previous results have demonstrated that the birefringence dispersion can also be controlled using the PS/PPO blend ratio, 20 which can be explained based on equation (17).…”

Section: Effects Of Orientation Functions On Birefringence Dispersionsupporting

confidence: 82%

“…22 However, there have been no attempts to examine whether the equation applies to birefringence dispersions that increase with increasing wavelengths of light. Figure 10 shows the fitting results for an ideal wide-band dispersion to ascertain the necessary parameter values for equation (28). Using the first three terms of Cauchy's equation is sufficient to express ideal dispersion, as shown in Figure 10.…”

Section: Theoretical Study Of Bdcmentioning

confidence: 99%

“…The film was stretched at 230 1C and a draw ratio of 1.9. The triangles and solid line show the experimental results and the curve fitted using equation (28). A full color version of this figure is available at Polymer Journal online.…”

Section: Necessary and Sufficient Conditions For The Industrializatiomentioning

confidence: 99%

“…The birefringence slopes at 550 nm were obtained from the fitting curves using Cauchy's equation (28).…”

Section: Birefringence and Polarized Irmentioning

confidence: 99%

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Copolycarbonate optical films developed using birefringence dispersion control

Uchiyama

Ono

Ikeda

et al. 2012

Polym J

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A retardation film is a type of optical film that is widely used as a polarization transformation material to improve the image quality of flat panel displays (FPDs). One of the issues associated with retardation films has been the wide-banding of birefringence dispersion. A conventional optical design method that uses double-layered retardation films has been adopted to achieve wide-band properties. However, this conventional method has problems that have led to the demand for a single retardation film with wide-band birefringence properties. This situation motivated us to develop birefringence dispersion control (BDC) and to develop new polymers based on our novel molecular design. Wide-band characteristics are obtained using copolymers or miscible blends of polymers comprised of positive and negative anisotropic monomer units at specific volume fractions. The wide-band properties appear in a narrow range near the birefringence zero point, which is determined by the monomer volume fractions. The relationship between the orientation functions and birefringence dispersion is also clarified using theoretical studies, polarized IR and birefringence measurements. We have successfully industrialized a wide-band retardation film consisting of a newly developed copolycarbonate (co-PC) with a fluorene ring using the novel BDC theory. This film exhibits superior optical properties in FPDs.

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Section: Effects Of Orientation Functions On Birefringence Dispersionsupporting

confidence: 82%

Section: Theoretical Study Of Bdcmentioning

confidence: 99%

Section: Necessary and Sufficient Conditions For The Industrializatiomentioning

confidence: 99%

“…The birefringence slopes at 550 nm were obtained from the fitting curves using Cauchy's equation (28).…”

Section: Birefringence and Polarized Irmentioning

confidence: 99%

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Copolycarbonate optical films developed using birefringence dispersion control

Uchiyama

Ono

Ikeda

et al. 2012

Polym J

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“…Blends of PS with poly(2,6-dimethyl-pphenylene oxide) (PPO) have been extensively investigated by thermal analysis, FT-IR, NMR, and found to be fully miscible several decades ago. [1][2][3][4][5][6][7][8][9] The phase behavior of PS/poly(α-methyl styrene) (PαMS) blend systems has also been investigated. [10][11][12][13][14][15][16] Interestingly, although the structures of PS and PαMS differ only by a methyl group (-CH 3 ) at the α-position on the main chain, the PS/PαMS blend system is immiscible at ambient temperature but turns out to be miscible above 240 • C depending on molecular weights of their blends.…”

mentioning

confidence: 99%

Solid-State NMR Characterization on the Molecular-Level Homogeneity in Lower Critical Solution Temparature Mixtures of Poly(α-methyl styrene) and Poly(2,6-dimethyl-p-phenylene oxide)

Woo

Chou

et al. 2003

Polym J

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ABSTRACT:The length scale of heterogeneity in blends of poly(2,6-dimethyl-p-phenylene oxide) (PPO) with poly(α-methyl styrene) (PαMS) was investigated using solid state 13 C NMR. The PPO/PαMS blend system was homogeneous at ambient, but phase separation at or above the lower critical solution temperature (LCST) was confirmed by polarized-light microscopy (PLM) and differential scanning calorimetry (DSC). Fourier-transform infrared spectroscopy (FT-IR) characterization confirmed that there was no specific interaction between PPO and PαMS. The scales of homogeneity in the blend were examined.

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Partially miscible EVOH/copolyamide-6/6.9 blends: The effect of stretching on the structure

Nir¹,

Narkis²,

Siegmann³

2000

J. Polym. Sci. B Polym. Phys.

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Binary blends of random copolymers, ethylene‐vinyl‐alcohol (EVOH) consisting of 38 mol % ethylene and Copolyamide‐6/6.9 with an approximate 1 : 1 comonomer ratio, were prepared via blown‐film extrusion and uniaxial stretching. The anisotropy induced by the uniaxial deformation of the polymer blends was characterized by X‐ray diffraction and birefringence measurements. The stretched films also were investigated via oxygen permeability. The results showed a sharp decrease in the apparent crystallite size throughout the entire composition range in comparison to the blown films. However, the order perceived within the amorphous phase in the EVOH‐rich blends increased (decrease in oxygen permeability), whereas in the copolyamide‐rich blends, orientation resulted in a decrease in the amorphous phase order (increase in permeability). Apparently, orientation destroyed the amorphous interpolymer complex. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 813–822, 2000

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Fourier transform infra-red study of uniaxially oriented poly(2,6-dimethyl 1,4-phenylene oxide)-atactic polystyrene blends

Cited by 75 publications

References 11 publications

Copolycarbonate optical films developed using birefringence dispersion control

Copolycarbonate optical films developed using birefringence dispersion control

Solid-State NMR Characterization on the Molecular-Level Homogeneity in Lower Critical Solution Temparature Mixtures of Poly(α-methyl styrene) and Poly(2,6-dimethyl-p-phenylene oxide)

Partially miscible EVOH/copolyamide-6/6.9 blends: The effect of stretching on the structure

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