Opto-mechanical properties of fibres. Part 3. Structural characterization of uniaxial orientation in drawn poly(ethylene terephthalate) by means of optical parameters

Fouda, I. M.; Shabana, H.M.

doi:10.1002/(sici)1097-0126(199903)48:3<198::aid-pi137>3.0.co;2-f

Cited by 7 publications

(2 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, the calculated density could also be used to follow the continuous changes occurring during the physical changes of the samples under investigation. The obtained values of the evaluated crystallinity and density were dependent on the nature of the polymer mechanical process 34–37…”

Section: Resultsmentioning

confidence: 99%

Optomechanical properties of the morphology of viscose fibers due to the cold‐drawing process

Fouda¹,

Seisa²

2008

J of Applied Polymer Sci

View full text Add to dashboard Cite

This study sheds light on the changes produced by the effects of cold-drawn fibers on the microstructure and macrostructure of viscose fibers. The optical properties and strain produced in viscose fibers were measured interferometrically at room temperature. Structural parameters were calculated, such as the work per unit of volume, the reduction in entropy due to elongation, and the harmonic mean specific refractivity. In addition, the resulting data were used to calculate the optical stress coefficient and optical configuration and to apply the Mooney-Rivlin equation to determine the constants. Also, the number of crystals per unit of volume and the average orientation angle for uniaxial stretching were calculated with the extension ratios. The relation between the true stress and strain hardening was calculated. The average value of the maximum birefringence was determined to equal 0.046. The relations between the optical and mechanical changes with different parameters were established for the studied fibers. Microinterferograms and curves were drawn for illustration.

show abstract

Section: Resultsmentioning

confidence: 99%

Optomechanical properties of the morphology of viscose fibers due to the cold‐drawing process

Fouda¹,

Seisa²

2008

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Under annealing and cold drawing conditions and following the obtained optical and mechanical parameters results, a polymeric material was obtained with modified physical properties that were due to the changes in the Δ S , CED, δ 2 , μ, E , and optical parameters. Also, to explain the different variations obtained because of thermomechanical effects, there are several structural processes that interfered that should be taken into consideration, which are discussed elsewhere 37–39. Although the degree of orientation always increases in the course of drawing, crystallinity can change in both directions.…”

Section: Discussionmentioning

confidence: 99%

Optothermal properties of fiber morphology on nylon 66 fibers due to annealing and drawing processes

Fouda

2002

J of Applied Polymer Sci

View full text Add to dashboard Cite

ABSTRACT:The changes produced by the effects of annealed and drawn fibers on the microstructure and macrostructure of nylon 66 fibers are considered. The optical properties and strain produced in nylon 66 fibers under different conditions are measured interferometrically at room temperature. Structural parameters are calculated such as the average work per chain, the work per unit volume, the reduction in entropy due to elongation, and the work stored in the body as strain energy. The evaluation of the density aided the calculation of the crystallinity, the mean square density fluctuation, the isotropic refractive index, the harmonic mean polarizability of the dielectric, and the harmonic mean specific refractivity. In addition, the resulting data are utilized to calculate the optical stress coefficient and the optical configuration and to apply the Mooney-Rivlin equation to determine its constants. Also, the number of crystals per unit volume and the average orientation angle for uniaxial stretching are calculated by the extension ratio. The relations between the optical, mechanical, and thermal changes with different parameters are given for the studied fibers.

show abstract

Polyester Fibers

Hansen

Atwood

2005

Kirk-Othmer Encyclopedia of Chemical Technology

View full text Add to dashboard Cite

Polyester fiber is the largest volume, most versatile synthetic fiber in the world. Useful textile fibers of poly(ethylene terephthalate) (PET) were invented in the 1940s and commercially introduced by Du Pont and ICI in the 1950s. A broad range of PET processing options allows the fiber to be engineered for a variety of uses by modifying the filament size, cross‐sectional shape, polymer molecular weight, tensile strength, composition, dyeability, luster, and color, as well as other fiber properties. Poly(ethylene terephthalate) is produced by ester interchange of dimethyl terephthalate and ethylene glycol to form a monomer, or by direct esterification of terephthalic acid with ethylene glycol to form an oligomer. The low molecular weight monomer or oligomer is polycondensed at high temperature and reduced pressure to form a PET polymer. Polyester is melt‐spun over a wide range of spinning speeds depending on the desired use. The mechanical and thermal properties of PET fiber are affected by the degree of molecular orientation and crystallinity, which depend on the fiber formation process used. At low spinning speeds, fibers are usually further drawn to obtain useful tensile properties. At high spinning speeds, useful PET yarns can be obtained directly. Additional processing steps, including drawing, thermal treatment, texturing, and others, significantly influence the fiber physical properties and applications.

show abstract

Opto-mechanical properties of fibres. Part 3. Structural characterization of uniaxial orientation in drawn poly(ethylene terephthalate) by means of optical parameters

Cited by 7 publications

References 15 publications

Optomechanical properties of the morphology of viscose fibers due to the cold‐drawing process

Optomechanical properties of the morphology of viscose fibers due to the cold‐drawing process

Optothermal properties of fiber morphology on nylon 66 fibers due to annealing and drawing processes

Polyester Fibers

Contact Info

Product

Resources

About