Optothermal properties of fibers. XIV. Investigation of some optical structural parameters of annealed and cold drawn polyester fibers

Fouda, I. M.; Kabeel, M. A.; El‐Sharkawy, F. M.

doi:10.1002/(sici)1097-4628(19980705)69:1<33::aid-app5>3.0.co;2-n

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…From literature, the average refractive index for PET is usually in the range of 1.57-1.66. 2,[9][10][11][12][13] Much less is reported on the properties of PEN, but the range of the average refractive index is reported to be 1.64-1.90. 14,15 From the fit results, the in-plane birefringence ∆n c-b and the out-plane birefringence ∆n b-a were calculated.…”

Section: Resultsmentioning

confidence: 99%

“…The data were fit to the mathematical model over a range of values for the average refractive index. From literature, the average refractive index for PET is usually in the range of 1.57−1.66. ,− Much less is reported on the properties of PEN, but the range of the average refractive index is reported to be 1.64−1.90. , From the fit results, the in-plane birefringence Δ n c - b and the out-plane birefringence Δ n b - a were calculated. Measurements of in-plane birefringence were also taken using an Olympus U-CTB Berek compensator.…”

Section: Resultsmentioning

confidence: 99%

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Conoscopic Measurement of Birefringence and Orientation in Biaxially Stretched Polymer Films and Sheets

Horn

Winter

2003

Macromolecules

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The technique for using conoscopy to determine the optical orientation and birefringences of stretched polymer films is presented here in detail. The method is nondestructive and has the capacity for implementation both off-line and online during processing. Analysis was performed on films of polyethylene naphthalate (PEN) and poly(ethylene terephthalate) (PET), with birefringence results compared to measurements using a Berek compensator. The technique is highly effective at measuring the orientation and in-plane principal birefringence, though an accurate measure for a film's out-plane birefringence requires knowledge of at least an approximate value for the material's average refractive index.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Conoscopic Measurement of Birefringence and Orientation in Biaxially Stretched Polymer Films and Sheets

Horn

Winter

2003

Macromolecules

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“…They gave the relation between the structural parameters with different strain for PET and PE fibers. Fouda et al also used multiple‐beam Fizeau fringes method to investigate the changes in optical properties due to annealing and cold drawing processes of PET (Fouda, Kabeel, & El Sharkawy, ), nylon 66 (Fouda, ), nylon 6 (Fouda, ), PP (Fouda, ), and viscose fibers (Fouda, Oraby, & Seisa, ).…”

Section: Introductionmentioning

confidence: 99%

A modified formula for accurate determination of three‐dimensional birefringence of fiber using modified subfringe integration method

El‐Morsy

2019

Microscopy Res & Technique

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The development of the use of interferometric techniques in the study of the optical properties of materials encouraged many researchers to work on the derivation and development of the theoretical considerations and the equations used in the calculations of those properties. The form of these equations depends on the technique used and the cross section of the sample, and also on the method of calculating the optical path difference of light across the sample studied. A modified formula to calculate the three‐dimensional birefringence distribution of the fiber, without the need to determine the refractive indices of the fiber in the parallel and perpendicular directions, was presented. The phase distribution of the simulated and experiment interferograms was obtained using subfringe integration method. The results obtained from the new method were compared with the calculated results of a well‐known method (Z method) and the figures presented showed that the results of the two methods were close to each other.

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Optical and Structural Properties of Nylon 6 Fibres Exposed to UV Radiation

Shabana

1999

Polymers and Polymer Composites

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Nylon 6 fibres irradiated in air by a UV source were examined by a two-beam polarizing interference microscope. Refractive indices and birefringence values were obtained experimentally and compared with those of unirradiated samples. The experimental measurements were used to calculate some optical and structural parameters. Polarizabilities per unit volume, isotropic and virtual refractive indices, orientation function and angle, degree of crystallinity, molar refractivity and specific refractivity of the dielectric were among the calculated parameters. The effect of UV radiation on the refractive indices along the diameter, and related parameters were investigated. Relationships between optical and structural parameters and their changes with the exposure time are discussed. The study shows that new reorientation occurred as a result of radiation.

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Optothermal properties of fibers. XIV. Investigation of some optical structural parameters of annealed and cold drawn polyester fibers

Cited by 3 publications

References 6 publications

Conoscopic Measurement of Birefringence and Orientation in Biaxially Stretched Polymer Films and Sheets

Conoscopic Measurement of Birefringence and Orientation in Biaxially Stretched Polymer Films and Sheets

A modified formula for accurate determination of three‐dimensional birefringence of fiber using modified subfringe integration method

Optical and Structural Properties of Nylon 6 Fibres Exposed to UV Radiation

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