Studies on Dry Spinning of Polyurethane-Urea Elastomers: Theory and Experiment

Ishihara, Hideaki; Tani, Kazuo; Hayashi, Seishu; Ikeuchi, H.

doi:10.1515/polyeng.1986.6.1-4.237

Cited by 12 publications

(8 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To validate this, a set of spinning trials was carried out with an increased DMF/water bath ratio of 65 : 35 at the bath temperature of 15 C, but the spinning was not feasible. Spinning was also not possible with a bath concentration of 60 : 40 at a lower bath temperature of 13 C. Therefore, it has been concluded that a DMF/water bath ratio of 60 : 40 and a bath temperature of 15 C are the optimum conditions under this experimental setup. To study the influence of higher stretch ratios, fibers were spun with increasing stretch ratios (up to 2.5) with a bath ratio of 60 : 40 at 15 C. A significant improvement in the elastic recovery property (Fig.…”

Section: Experimental Validation Of the Design Resultsmentioning

confidence: 99%

“…Three dryjet lengths (15,20, and 25 mm) and three dope solid contents (27, 29, and 31% w/w) were investigated to study their effects on the fiber properties under optimized bath conditions: a bath ratio of 60 : 40, a bath temperature of 15 C, and a stretch ratio of 1.8-2.5.…”

Section: Experimental Designmentioning

confidence: 99%

“…Figure 6 Influence of the stretch ratio on the elastic recovery. The spinning conditions were as follows: a DMF/water ratio of 60 : 40 and a bath temperature of 15 C. Coefficient of variation (CV) was 1.5% for elastic recovery, 4% for elongation, and 7% for tenacity. nonsolvent content in the bath increases.…”

Section: Bath Concentration and Temperaturementioning

confidence: 99%

“…Hence, fiber spinning was observed to be difficult at jet lengths of less than 10 and more than 30 mm. For a comparison of the effect of the jet length, fibers were therefore spun with three dry-jet lengths (15,20, and 25 mm) and tested for the elastic recovery and tensile properties. No statistically significant differences were observed at the 95% confidence level in the elastic recovery and tensile properties among the fibers obtained with various jet lengths, as shown in Table VIII.…”

Section: Effect Of the Dry-jet Length On The Fiber Propertiesmentioning

confidence: 99%

“…Yamashiro 12,13 studied the relationship between the chemical structure and the mechanical properties of melt-spun segmented PU and reported that the mechanical properties of these fibers are influenced by the aggregation of hard and soft segments and also the chemical structure of the soft segments. It has been reported 14,15 that the hard-segment orientation affects the mechanical properties of PU fibers and especially the modulus. Abhiraman et al 16 reported that complete phase separation between the hard and soft segments is essential to obtain good elastic recovery after deformation.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Dry‐jet‐wet spun polyurethane fibers. I. Optimization of the spinning parameters

Reddy¹,

Deopura²,

Joshi³

2010

J of Applied Polymer Sci

View full text Add to dashboard Cite

This study examined the spinning of polyurethane-based elastomeric fibers with the dry-jet-wet spinning method. The three important spinning variables that were chosen were the coagulation bath ratio (dimethylformamide/water), the bath temperature, and the stretch ratio. A three-variable factorial design method, proposed by Box and Behnken, was used to optimize these process parameters. The spinning process was further fine-tuned by the variation of the stretch ratio and the dope solid content. The effect of the dry-jet length on the fiber properties was also studied. The tenacity and elastic recovery properties of the fibers were found to be optimum at a bath ratio (dimethylformamide/water) of 60 : 40, a bath temperature of 15 C, and a stretch ratio of 2.5. The density and sonic modulus were measured to determine the effect of varying the process variables on structural parameters such as the density and orientation. The surface morphological features, as revealed by scanning electron microscopy, were correlated to the fiber properties.

show abstract

Section: Experimental Validation Of the Design Resultsmentioning

confidence: 99%

Section: Experimental Designmentioning

confidence: 99%

Section: Bath Concentration and Temperaturementioning

confidence: 99%

Section: Effect Of the Dry-jet Length On The Fiber Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dry‐jet‐wet spun polyurethane fibers. I. Optimization of the spinning parameters

Reddy¹,

Deopura²,

Joshi³

2010

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

Fibers, Elastomeric

Boliek

Jensen

2000

Kirk-Othmer Encyclopedia of Chemical Technology

View full text Add to dashboard Cite

Most elastomeric fibers are currently produced from either natural rubber or segmented polyurethane polymers. The elastic properties or rubber fibers derive from chemical cross‐links formed by vulcanization of either sheets or extruded threads. The segmented polyurethanes, called spandex fibers, are linear block copolymers with relatively long weakly interacting segments that are interconnected by shorter blocks in which intermolecular interactions are strong. Rubber fibers are formed either by slitting vulcanized sheets or by extruding latex into a coagulation bath followed by heating to vulcanize. Spandex fibers are most commonly formed by passing polymer solution through a spinneret followed by removal of solvent; certain spandex compositions can be formed into fibers by melt extrusion. These fibers are normally blended with hard fibers such as nylon, polyester, or cotton to form fabrics with desirable stretch and recovery characteristics. Stabilizers must be included with elastomeric fibers to provide adequate protection from exposure to heat, sunlight, atmospheric pollutants, and active chlorine materials. The unique properties and availability in fine sizes compared to rubber has recently allowed extensive penetration of spandex fibers into hosiery and sportswear markets.

show abstract

Fibers, Elastomeric

Boliek

Jensen

2009

Kirk-Othmer Encyclopedia of Chemical Technology

View full text Add to dashboard Cite

Elastomeric fibers can be made from natural or synthetic polymeric materials that provide product with high elongation, low modulus, and good recovery from stretching. These fibers are made primarily from polyisoprenes (natural rubber) or polyurethanes and to a lesser extent, segmented polyesters. In the United States the generic designation spandex has been given to a manufactured fiber in which the fiber‐forming substance is a long‐chain synthetic polymer comprised of at least 85% of a segmented polyurethane. Manufacture of cut rubber and extruded latex thread are discussed. Spandex fiber can be produced by four processes: melt extrusion, reaction spinning, solution dry spinning (the most common method) and solution wet spinning. Uses for cut thread and extruded latex are as a covered rubber in narrow fabrics, braids, surgical hosiery, and strip lace. Spandex fibers are used extensively in sportswear and hosiery products.

show abstract

Studies on Dry Spinning of Polyurethane-Urea Elastomers: Theory and Experiment

Abstract: 238

Cited by 12 publications

References 14 publications

Dry‐jet‐wet spun polyurethane fibers. I. Optimization of the spinning parameters

Dry‐jet‐wet spun polyurethane fibers. I. Optimization of the spinning parameters

Fibers, Elastomeric

Fibers, Elastomeric

Contact Info

Product

Resources

About