Opto-thermal properties of fibers — 2. Structural characteristics of cold drawn annealed Egyptian polyester (PET) fibers

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

doi:10.1016/s0142-9418(96)00051-7

Cited by 7 publications

(5 citation statements)

References 28 publications

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“…This molecular arrangement leads to increase in the impact strength of the material which becomes less brittle [13]. This result is confirmed from the noticed increasing the mean refractive index n || and the birefringence (Dn) with the draw ratio (see Figs.…”

Section: Discussionsupporting

confidence: 69%

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Influence of Drawing and Temperature on the Optical and Structural Properties of Monofilament PP Sutures

Seisa

2006

International Polymer Processing

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The influence of drawing and temperature on the optical and structural properties of monofilament polypropylene sutures (PP) were investigated using interferometry. Two techniques have been used in this study: 1) the polarizing interference microscope, 2) multiple-beam Fizeau interferometry. The polarizing interference microscope is used to study the variation of refractive indices and birefringence of PP sutures at different draw ratios and stresses. The stress-strain diagram of PP sutures was studied. The resulting data was used to calculate the average work per chain, Poisson's ratio, strain optical coefficient, Young's modulus and optical orientation function. Multiple-beam Fizeau interferometry was used to study the temperature effect on optical properties of PP sutures with temperature ranging from 19 to 40°C. Relationships between the optical parameters at different temperatures are given. Calculation of the density, crystallinity, dielectric constant and dielectric susceptibility at different temperatures are done. The results obtained, clarify the effect of drawing and temperature on the structure of PP sutures. Microinterferograms are given for illustration.

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Section: Discussionsupporting

confidence: 69%

“…It is clear that, as the draw ratio and stress increases, the mean refractive index (n || ) of PP sutures increases. This means that orientation increases the impact strength, i. e. it makes a material less brittle [13]. Also, n ?…”

Section: Refractive Indices (N || N ? ) and Birefringence Dnmentioning

confidence: 99%

Influence of Drawing and Temperature on the Optical and Structural Properties of Monofilament PP Sutures

Seisa

2006

International Polymer Processing

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“…This may be formed by the orientation of PET and LA molecular segments in the fiber. [ 42–45 ] Meanwhile, the characteristic peak of PLA also appeared in the XRD patterns in Figure 3e. After drawing, the PETLAs fibers showed a crystallization peak of PLA at 2θ = 16.9°.…”

Section: Resultsmentioning

confidence: 94%

Thermal Stability of Bio‐Based Aliphatic‐Semiaromatic Copolyester for Melt‐Spun Fibers with Excellent Mechanical Properties

Zhou

Zhu

Pan

et al. 2020

Macromol. Rapid Commun.

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Flexible aliphatic poly(lactic acid) is introduced into polyethylene terephthalate through copolymerization to prepare biodegradable copolyester, which aims to solve the non‐degradability of polyethylene terephthalate (PET) and realize the greening of raw materials. In this work, poly(ethylene terephthalate‐co‐lactic acid) random copolyesters (PETLAs) of lactic acid composition from 10 to 50% is synthesized via one‐pot method. The chemical structure and composition, thermal property, and crystallization property of prepared PETLAs resin are characterized. The results shows that the introduction of LA segment forms random copolyester, and the flexible LA segment results in slight decrease in the glass transition temperatures (Tg), melting point (Tm), and crystallinity (Xc) of the copolyesters. The thermal stability of PETLAs is better, and the initial decomposition temperature of PETLA‐10 can reach 394 °C. The PETLAs resin exhibits good processability, and PETLAs fibers are prepared by melt spinning. The strength of PETLA‐10 fiber can reach 260 MPa after drawing treatment, and the elongation at break can reach 130%. Taking advantage of their features, PETLAs as an innovative bio‐based polymer are expected to achieve ecofriendly applications in the fields of fiber, plastic, and film.

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“…The mean values of the refractive indices of the fiber and the total mean birefringence were calculated using the equations that were extensively used in our previous publications 15–18. The Kuhen–Treloar type theory gives19 where F θ is the Herman orientation function20; N c is the number of chains per unit volume that depends on the number of crystallites in the polymer material; and D is the draw ratio, where D = l d / l u and D = 1 + d , d is the strain, l d is the fiber length before drawing, and l u is the length after drawing.…”

Section: Theoreticalmentioning

confidence: 99%

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

Fouda

2002

J of Applied Polymer Sci

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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.

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Opto-thermal properties of fibers — 2. Structural characteristics of cold drawn annealed Egyptian polyester (PET) fibers

Cited by 7 publications

References 28 publications

Influence of Drawing and Temperature on the Optical and Structural Properties of Monofilament PP Sutures

Influence of Drawing and Temperature on the Optical and Structural Properties of Monofilament PP Sutures

Thermal Stability of Bio‐Based Aliphatic‐Semiaromatic Copolyester for Melt‐Spun Fibers with Excellent Mechanical Properties

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

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