✦ LIBER ✦

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

✍ Scribed by I. M. Fouda; M. A. Kabeel; F. M. El-Sharkawy

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 265 KB
Volume: 69
Category: Article
ISSN: 0021-8995
DOI: 10.1002/(sici)1097-4628(19980705)69:1<33::aid-app5>3.0.co;2-n

No coin nor oath required. For personal study only.

✦ Synopsis

Two-beam interferometry and density methods previously measured are used to study the changes in optical properties of annealed and cold drawn polyester (PET) fibers. Some structural parameters in the present work are determined, such as form birefringence, the number of molecules per unit volume, the virtual refractive index, the harmonic mean polarizability of the dielectric, the harmonic mean specific refractivity, and the isotropic refractive index. Also, the distribution of segment at an angle with respect to the draw ratio and the electric polarizability constant ( Da/3a 0 ) are determined. The generalized Lorentz-Lorenz equation given by de Vries is used to determine PET fiber structure parameters. Comparison between the results have been made with the Hermans optical orientation function.

📜 SIMILAR VOLUMES

Optothermal properties of fibers. VII. O

Optothermal properties of fibers. VII. Optical investigation of annealed nylon-6 fibers

✍ I. M. Fouda; M. M. El-Tonsy; F. M. Metawe; H. M. Hosny; K. R. Easawi 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 491 KB 👁 1 views

The influence of annealing on the birefringence of nylon-6 fibers was examined. These fibers were found to show considerable optical anisotropy. Three independent techniques were used to study the optical anisotropy in these fibers. The first technique to determine the diameter of the fiber from the

Optothermal properties of fibers—20—rela

Optothermal properties of fibers—20—relation between physical structure and mechanical properties of cold drawn polypropylene fibers

✍ I. M. Fouda 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 393 KB 👁 2 views

The structure of annealed polypropylene (PP) fibers is studied interferometrically using two-beam Pluta polarizing interference microscope connected to a device to study the draw ratio with birefringence changes dynamically. Relations of drawing changes with some optical and physical parameters are

Optothermal properties of fibers. XIII.

Optothermal properties of fibers. XIII. Evaluation of the form birefringence and some other structural parameters due to thermal annealing for polyester (PET) fibers

✍ I. M. Fouda; M. A. Kabeel; F. M. El-Sharkawy 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 249 KB 👁 2 views

In this work, changes in the structure of polyester [poly(ethylene-terephtalate) (PET)] fibers after annealing at constant temperature (120 and 140ЊC) and different times were studied interferometrically. The density of annealed PET fibers were measured by a system based on vibrating string. The Plu

Opto-thermal properties of fibers. XVI.

Opto-thermal properties of fibers. XVI. Macrostructural and optical properties of cold-drawn, quenched PET fibers

✍ I. M. Fouda; F. M. El-Sharkawy 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 352 KB 👁 1 views

In this article, the relation between the macrostructural changes in uniaxially stretched polyester (PET) fibers, caused by heat treatment, and quenched in coarse-grain ice were studied. The developing macrostructure was determined using double-beam interferometry. Application was carried out by two

Determination of optical properties, dis

Determination of optical properties, dispersion, and structural parameters of poly(ethylene terephthalate) fibers using automatic variable wavelength interferometry technique

✍ T. Z. N. Sokkar; K. A. El-Farahary; M. A. El-Bakary 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 101 KB