Studies on the orientation phenomena by fiber formation from polymer melts. III. Effect of structure on orientation. Condensation polymers

Ziabicki, Andrzej; Kedzierska, Krystyna

doi:10.1002/app.1962.070061913

Cited by 56 publications

(11 citation statements)

References 4 publications

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“…Ziabicki and K dzierska also observed a similar sharp X-ray diffraction pattern in PU fiber and concluded that there was an ordered structure of the PU fibers. 24 A lattice fringe image is shown in Figure 7(b). Clear lines on the lattice fringe image are evident that the PU fiber has high degree of molecular orientation and crystallinity.…”

Section: Tem Analysismentioning

confidence: 99%

Study on microstructure and mechanical properties of polydiacetylene composite biosensors

Hassan

Gentry‐Weeks

Reynolds

et al. 2019

J of Applied Polymer Sci

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10,12-Pentacosadiynoic acid (PCDA) monomers were mixed with polyurethane (PU) or poly(ethylene oxide) (PEO) and the mixtures were electrospun to obtain composite nanofibers that were then photopolymerized via ultraviolet radiation, resulting polydiacetylene (PDA) in the nanofibers. The PDA demonstrated color-changing properties in the presence of Escherichia coli, which exhibited potential for developing flexible colorimetric biosensors for medical textiles. Phase separation was found in the PEO-PDA fibers, resulting in amorphous PEO accumulation at the fiber surface. In contrast, the PU-PDA fibers demonstrated a homogeneous microstructure throughout the fibers. Tensile test results suggested a molecular orientation in the PU-PDA fibers that significantly improved the mechanical properties of the fibers. The presence of PDA in the matrix polymer reduced the overall strength and breaking elongation of both composite nanofibers in comparison to 100% PEO and PU fibers. A single PU-PDA fiber showed significantly higher stiffness and modulus than a single PEO-PDA fiber. Force-distance curve analysis suggested that the PU-PDA fibers exhibited an elastic deformation. In a comparison, the PEO-PDA fibers were brittle and showed low modulus. The results of structural and mechanical properties suggest that the PU-PDA nanofibers are a promising composite for developing nonadherent, durable, and flexible colorimetric biosensors used in medical textiles.

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Section: Tem Analysismentioning

confidence: 99%

Study on microstructure and mechanical properties of polydiacetylene composite biosensors

Hassan

Gentry‐Weeks

Reynolds

et al. 2019

J of Applied Polymer Sci

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“…31 At the same draw ratio, the degree of orientation of EV-44 is higher than that of EV-32 and EV-38, which may be due to the relative low content of OH side groups of EV-44 so that molecular chains have less steric hindrance and molecular interaction of hydrogen bond during drawing. Figure 6 shows DSC thermograms of (a) EV-32, (b) EV-38 and (c) EV-44 fibers at the drawing temperature of 80 C and various draw ratios.…”

Section: Resultsmentioning

confidence: 93%

A study of ethylene vinyl alcohol copolymer fiber for the drawing process

Rwei

Jue

Chiang

et al. 2016

Textile Research Journal

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This study investigates the effect of the drawing process of ethylene vinyl alcohol (EVOH) fibers on their physical properties. Three different ethylene contents, namely EV-32, EV-38 and EV-44, were used where the ethylene content has the order of EV-44 > EV-38 > EV-32. The result indicates that at the same drawing temperature and draw ratio, the online drawing stress of the fiber with high ethylene content is higher than that with low ethylene content. Moreover, the drawn EVOH fiber, at the drawing temperature of 80 C and the draw ratio of 2.0, exhibits an optimal mechanical property. As the draw ratio increases, the online drawing stress, birefringence and initial modulus increase. Notably, unlike typical polymeric fibers, the glass transition temperature (T g ) of the drawn EVOH fibers decreases with the draw ratio due to more water being absorbed by thinner fibers within the same number of samples. The draw ratio was found to have little effect on the melting temperature (T m ). At the same draw ratio, the online drawing stress, birefringence, stress and initial modulus of the fiber EV-44, which has the highest ethylene content, is higher than those of EV-32 and EV-38. The creep strain of the drawn fibers EV-32 and EV-38 linearly increase with the drawing time when the applied stress maintains constant at 150 MPa, while an insignificant increase is observed for EV-44, suggesting that EV-44 is difficult to deform and has higher size stability. In the stress relaxation test, the elongation increases with the initial stress. At the same elongation percentage, the initial stress of the drawn fibers has the following trend: EV-44 > EV-38 > EV-32 and the stress relaxation time () has the following trend: EV-44 > EV-38 > EV-32, indicating again that EV-44 is relatively difficult to deform during drawing. Finally, EV-44 fiber performed the best in the hot water resistance test.Keywords ethylene vinyl alcohol, melt spinning, draw ratio, online draw stress, creep strain, stress relaxation time Ethylene vinyl alcohol (EVOH) copolymer fibers have received great attention because EVOH copolymers have a hydrophilic nature but they are difficult to fabricate. The single-component EVOH fibers were previously studied for melt-spinnability using three different ethylene contents. 1 The properties of EVOH have also been studied 2-5 and are influenced by its ethylene content, 1,6-8 crystallinity, temperature, humidity and other factors. Higher ethylene content in EVOH corresponds to a lower gas barrier 9-13 and a lower temperature of extrusion. Oxygen diffusion through EVOH is limited by high intermolecular and intramolecular cohesive energy. 14 Moreover, water that is dissolved in EVOH has a plasticizing effect that facilitates the relative motion of molecular chains and macromolecules. Therefore, the presence of water in the hydrophilic polymer matrix not only influences the sorption and diffusion of the permeate but also leads to depression of the glass transition temperature (T g ) of the polymer due to the plasticization ef...

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“…In generali the shape of the curve in Figure 4 is the same as those by Ziabicki and Kedzierska. 6 The relationships between fiber diameter and birefringence for variable changes in fiber diameter from 300 to 140 p had little effect on birefringence in the fiber, but changes in fiber diameter from 140 to 25 p resulted in a large increase in birefringence. Since birefringence is a measure of molecular orientation in the fiber, it was concluded that the large fibers (140 to 300 p in diameter) were spun a t a high local temperature because of the large diameter; whereas the smaller fibers (25-to 140-p range) cooled more rapidly and thus were spun at a lower local temperature, yielding a high degree of orientation.…”

Section: Resultsmentioning

confidence: 97%

“…The effect of take-up velocity on birefringence for variable flow rate and variable fiber diameter is shown in Figure 4. Figures 5 and 6, from an article by Ziabicki and Kedzierska,6 show the effect of take-up velocity on birefringence for conditions of constant fiber diameter with variable flow and for constant flow with variable diameter, respectively. In generali the shape of the curve in Figure 4 is the same as those by Ziabicki and Kedzierska.…”

Section: Resultsmentioning

confidence: 98%

“…Figures 5 and 6, from an article byZiabicki and Kedzierska,6 show the effect of take-up velocity on birefringence for conditions of constant fiber diameter with variable flow and for constant flow with variable diameter, respectively. In generali the shape of the curve inFigure 4is the same as those by Ziabicki and Kedzierska 6. The relationships between fiber diameter and birefringence for variable take-up velocities are plotted inFigures 7 and 8.…”

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confidence: 99%

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Spinning of poly(ethylene terephthalate) fibers from a melt pool without a spinneret

Wampler¹,

Gregory²,

Kennedy³

1972

J of Applied Polymer Sci

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synopsisMonofilament fibers were spun continuously from the free surface of a pool of molten poly(ethy1ene terephthalate) without the aid of a spinneret. For take-up velocities in the range of 12 to 400 ft/min, the denier of the filaments produced was an inverse power function of take-up velocity, and the birefringence was an inverse power function of the filament diameter. Production rate and product uniformity were strongly dependent on take-up velocity and surface temperature of the melt pool.

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Studies on the orientation phenomena by fiber formation from polymer melts. III. Effect of structure on orientation. Condensation polymers

Cited by 56 publications

References 4 publications

Study on microstructure and mechanical properties of polydiacetylene composite biosensors

Study on microstructure and mechanical properties of polydiacetylene composite biosensors

A study of ethylene vinyl alcohol copolymer fiber for the drawing process

Spinning of poly(ethylene terephthalate) fibers from a melt pool without a spinneret

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