✦ LIBER ✦

Opto-thermal properties of fibers. XI. The effect of thermal annealing of drawing behavior for Egyptian polyester fibers on the crystallinity and some optical parameters

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

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 552 KB
Volume: 68
Category: Article
ISSN: 0021-8995
DOI: 10.1002/(sici)1097-4628(19980531)68:9<1371::aid-app1>3.0.co;2-8

No coin nor oath required. For personal study only.

✦ Synopsis

The structure developed of annealed Egyptain poly(ethyleneterephthalate) (PET) fibers is studied interferometerically due to the drawing process. Using a twobeam Pluta polarizing interference microscope connected to a device to dynamically study the draw ratio with the birefringence changes, the relations of drawing changes with some optical parameters are given. The evaluation of density, the mean square density fluctuation »h 2 …, crystallinity, amorphous orientation, crystalline orientation functions, number of chains per unit volume N c , and number of random links between the network junction points N has been found. The results obtained clarify the effect of annealing time and temperature with different draw ratios on the structure of PET fibers. Empirical formula is suggested to correlate the changes in f u , u, Dn a , and A with the draw ratio. Microinterferograms and curves are given for illustration.

📜 SIMILAR VOLUMES

1-Opto-thermal properties of fibers anne

1-Opto-thermal properties of fibers annealing effect on the birefringence variations of polyester fibers

✍ A. A. Hamza; I. M. Fouda; M. A. Kabeel; E. A. Seisa; F. M. El-Sharkawy 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 369 KB 👁 2 views

Polyester (Egyptian) fibers were annealed at constant temperature (190ЊC) with different annealing times. Density, crystallinity, mean square density fluctuation, mechanical loss factor, and molecular orientation were calculated. Densities and mechanical loss factor were determined using an acoustic

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