The drawing behavior of polyvinylalcohol fibers

Schellekens, R.; Bastiaansen, Cwm Cees

doi:10.1002/app.1991.070431221

Cited by 59 publications

(40 citation statements)

References 21 publications

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“…Several spinning techniques such as gel spinning [16][17][18] and crosslinking spinning 19) , of great importance in commercial aspect, have been developed to enhance the mechanical properties of PVA fiber. Additional attempts to obtain high performance fibers following fiber spinning include ultrahigh drawing of gel-spun fiber 17) , zone drawing 20) , multi-step drawing 21) , hot drawing 22) , and annealing 23) .…”

Section: Design Of Spinning and Subsequent Drawing Parameters To Imprmentioning

confidence: 99%

“…Hence it is accepted that the formation of rigid crystals by hydrogen bonding should be limited for the effective drawing to obtain high-performance PVA fibers 16,20) . The extent of drawing which is applied in the preparation of gel fiber and then ultimate fiber has a critical effect on mechanical properties.…”

Section: Design Of Spinning and Subsequent Drawing Parameters To Imprmentioning

confidence: 99%

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Design of Spinning and Subsequent Drawing Parameters to Improve the Mechanical Properties of PVA Fibers

Chae¹,

Kim²,

Kim³

2016

Textile Coloration and Finishing

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In this study, efforts were made to enhance the mechanical properties of the poly(vinyl alcohol) (PVA) fibers of medium molecular weight(number-average degree of polymerization=1735) varying the ratio in DMSO/H2O mixed solvent and spinning/drawing conditions. The gel fibers prepared from pure DMSO were opaquely frozen in the coagulating bath of -20℃. However, transparent gel fibers were formed without freezing for the mixture to contain water less than 80wt%. As the amount of water in the mixture increased the residual solvent in the coagulated gel fibers decreased ranging from 85 to 42wt%. The complex viscosity increased with increasing PVA concentration in 80/20 DMSO/H2O exhibiting remarkable shear thinning at 18wt%. In the Cole-Cole plot, the 18wt% PVA solutions gave a deviated curve from 12 and 15wt% ones. Thus the optimum PVA concentration for the spinning processing of medium MW PVA solutions in 80/20 DMSO/H2O was determined to 18wt% with rheological concept. Low degree of drawing during hot drawing process in the dry state was available for high bath draft in the coagulation bath. The most improved mechanical properties were observed by applying the highest possible draw ratio attained by reducing bath draft over multi-step drawing process. In the given bath draft, linear relationship was observed between both tensile strength and modulus and draw ratio showing the inflection points at the draw ratio of 19.5 and 18.0 for tensile strength and modulus, respectively.

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Section: Design Of Spinning and Subsequent Drawing Parameters To Imprmentioning

confidence: 99%

Section: Design Of Spinning and Subsequent Drawing Parameters To Imprmentioning

confidence: 99%

Design of Spinning and Subsequent Drawing Parameters to Improve the Mechanical Properties of PVA Fibers

Chae¹,

Kim²,

Kim³

2016

Textile Coloration and Finishing

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“…Modification of chitosan with other polymers is a widely examined problem. As adblends to chitosan there are applied the following compounds: poly(vinyl alcohol) (Fambri, Pegoretti, Fenner, Incardona, & Migliaresi, 1997;Kim, Oark, & Kim, 2003;Mucha, Ludwiczak, & Kawiń ska, 2005;Schellekens & Bastiansen, 1991;Zhao et al, 2003) as well as polylactide and poly(lactid acid) (Messai et al, 2005;Peesan, Supaphal, & Rujiravanit, 2005). Great hopes are connected with chitosan blends containing cellulose and its derivatives (Hasagawa, Isogai, Onabe, Usuda, & Atalla, 1992;Twu, Huang, Chang, & Wang ,2003) and with poly(ethylene oxide) (Amiji, 1995;Wrzyszczyń ski et al, 1995;Mucha, Piekielna, & Wieczorek, 1999).…”

Section: Introductionmentioning

confidence: 98%

Modeling of water sorption isotherms of chitosan blends

Ludwiczak

Mucha

2010

Carbohydrate Polymers

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“…Particularly with gel spinning, one of methods to obtain high performance PVA fibers, it is indispensable to add cations to cause crosslinking when water is used as a solvent of PVA [3][4][5][6][7][8] . This inevitably makes the solution basic resulting in the corrosion of spinning systems.…”

Section: Introductionmentioning

confidence: 99%

Rheological Measurement of Fiber Spinnability of PVA Solution Dopes in DMSO

Chae¹

2010

Textile Coloration and Finishing

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Abstract-The effects of molecular weight (MW) and concentration on the rheological properties of poly(vinyl alcohol) (PVA) solutions in dimethyl sulfoxide (DMSO) were investigated at 30 o C. Ubbelohde viscometer and rotational rheometer were employed for dilute and concentrated regime, respectively. In the dilute regime, the Mark-Houwink exponent (α) of the solutions determined from three different MWs proved 0.73. The critical concentration (C*), in which the entanglement and overlap of polymer molecules began to take place, decreased with increasing the MW of PVA. Huggins constant (KH) values ranged from 0.33 to 0.45 over the MW examined. In the log-log plot of ηsp versus [η]C, the PVA with higher degree of polymerization (DP) gave a greater slope exhibiting the inflection point in the vicinity of C*. In the dynamic viscosity (η') curve, the PVA solutions of DP 1700 presented Newtonian fluid behavior over most of the frequency range examined. However, the lower Newtonian flow region reduced with increasing the DP. As the PVA concentration increased, η' was increased and the onset shear rate for pseudoplasticity was decreased. In the Cole-Cole plot, PVA solutions showed almost a single master curve in a slope of ca. 1.65 regardless of the DP. However, the increase of the concentration from 8 to 12 wt% for PVA solutions of DP 5000 decreased the slope from 1.73 to 1.57. In the tan δ curve, the onset frequency for sol-gel transition was shifted from 154 to 92 rad/s with increasing the DP from 3300 to 5000 and from 192 to 46 rad/s with increasing the concentration from 8 to 12 wt%. In addition, longer relaxation time (λ) was observed with increasing the DP and concentration.

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The drawing behavior of polyvinylalcohol fibers

Cited by 59 publications

References 21 publications

Design of Spinning and Subsequent Drawing Parameters to Improve the Mechanical Properties of PVA Fibers

Design of Spinning and Subsequent Drawing Parameters to Improve the Mechanical Properties of PVA Fibers

Modeling of water sorption isotherms of chitosan blends

Rheological Measurement of Fiber Spinnability of PVA Solution Dopes in DMSO

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