๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

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

โœ 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
369 KB
Volume
36
Category
Article
ISSN
0887-6266

No coin nor oath required. For personal study only.

โœฆ Synopsis

Polyester (Egyptian) fibers were annealed at constant temperature (190ะŠC) 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 method. Changes in the molecular orientation were evaluated from the resulting optical data using the polarizing Pluta interference microscope. Correlation of data obtained by one method with another leads to relational changes in optothermal properties and in the molecular orientation. Changes of refractive index profiles of annealed PET fibers are provided. Illustrations using graphs and microinterferograms are shown.

๐Ÿ“œ SIMILAR VOLUMES

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
โœ I. M. Fouda; M. A. Kabeel; F. M. El-Sharkawy ๐Ÿ“‚ Article ๐Ÿ“… 1998 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 249 KB ๐Ÿ‘ 1 views

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

Effect of air-gap distance on the morpho
Effect of air-gap distance on the morphology and thermal properties of polyethersulfone hollow fibers
โœ Tai-Shung Chung; Xudong Hu ๐Ÿ“‚ Article ๐Ÿ“… 1997 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 437 KB ๐Ÿ‘ 1 views

By using 30/70 polyethersulfone/NMP ( N-methyl-2-pyrrolidone) solutions as an example, we have determined the role of air-gap distance on nascent fiber morphology, performance, and thermal properties. An increase in air-gap distance results in a hollow fiber with a less layer of fingerlike voids and

Study of methyl-methacrylate-viscose fib
Study of methyl-methacrylate-viscose fiber graft copolymerization and the effect of grafting on thermal properties
โœ Ranjit Kumar Das; Diya Basu; Amarnath Banerjee ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 222 KB ๐Ÿ‘ 1 views

The graft copolymerization of methyl-methacrylate onto viscose fibers was studied under photoactive conditions with visible light using Ce 4ฯฉ /Ti 3ฯฉ combination as redox initiator in a limited aqueous medium. Polymerization conducted in the presence of light at 30 ฯฎ 1ยฐC produced significant grafting