Acrylic Fibers

Frushour, Bruce G.; Knorr, R.

doi:10.1201/9781420015270.ch12

Cited by 9 publications

(11 citation statements)

References 204 publications

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“…Respectively, the slow solidification rate decreases the formation of pores. 5 Although we did not measured the porosity of our filaments, P(L,DL)LA 70/30 filaments could be less porous based on the solidification rate [ Fig. 3(a)].…”

Section: Surface Structurementioning

confidence: 98%

“…5 C, and T g in the range from 59.6 to 61.7 C with an enthalpy relaxation (an endothermic peak) based on DSC measurements, as shown in Table II. The crystallinity of the P(L,DL)LA 70/30 filaments was lost and the filaments were amorphous, as shown in Figure 7.…”

Section: Crystallinity and Thermal Behaviormentioning

confidence: 99%

“…The voids are formed during the diffusion of solvent and nonsolvent in the spin bath. 5 Nelson et al 6 have reported the ultimate stress values of wet-spun filaments between 30 and 120 MPa.…”

Section: Introductionmentioning

confidence: 98%

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Effect of process parameters on properties of wet‐spun poly(L,D‐lactide) copolymer multifilament fibers

Rissanen

Puolakka

Hukka

et al. 2009

J of Applied Polymer Sci

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, multifilament fibers were prepared by wet-spinning and the effects of the spin draw ratio and the coagulant on the morphological, thermal, and mechanical properties of the filaments were studied. The hydrolytic degradation of filaments was studied in vitro. The filament diameter and the mechanical properties of filaments were highly dependent on the spin draw ratio, whereas the coagulant had no or minor effect. The filament diameters were in the range of 11-36 lm and the maximum tenacity of 150 MPa was obtained at the spin draw ratio of 7.0 for both copolymers. The copolymer had the main importance on the crystallinity of filaments, but it was also affected by the duration of the coagulation process. The crystallinities of P(L,D)LA 96/4 filaments were in the range of 5-16%, whereas P(L,DL)LA 70/30 filaments were totally amorphous. The degree of crystallinity had effect on the hydrolytic degradation of filaments. The tenacity loss of P(L,D)LA 96/4 filaments was about 10% and that of P(L,DL)LA 70/30 filaments was as high as 50% after 24 weeks in vitro.

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Section: Surface Structurementioning

confidence: 98%

Section: Crystallinity and Thermal Behaviormentioning

confidence: 99%

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Effect of process parameters on properties of wet‐spun poly(L,D‐lactide) copolymer multifilament fibers

Rissanen

Puolakka

Hukka

et al. 2009

J of Applied Polymer Sci

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“…14,22,23 The collapsed, serrated cross section was formed when the solidified outer skin was rigid and more solvent left the filament than nonsolvent entered. 20 After hot drawing, the filament structure was smoother, but the original serrated structure still existed as shown in Figure 2(c,d).…”

Section: Filament Surface Structurementioning

confidence: 89%

“…The skin-core structure was formed during the coagulation process and it is typical for wet-spun filaments. 20 The surface of filament was solidified immediately when immersed to the spin bath and thereby the skin was formed first. 16,21 Because the skin was solidified immediately, the solvent and nonsolvent were trapped inside the filament.…”

Section: Filament Surface Structurementioning

confidence: 99%

Effect of hot drawing on properties of wet‐spun poly(L,D‐lactide) copolymer multifilament fibers

Rissanen

Puolakka

Hukka

et al. 2009

J of Applied Polymer Sci

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The impact of guanidine carbonate incorporation on the molecular structure of polyacrylonitrile precursor fiber stabilized by a multistep heat treatment strategy

Tunçel

Rahman

Demirel

et al. 2022

Polymer Engineering & Sci

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Thermal‐oxidative stabilization of the polyacrylonitrile (PAN) precursor was performed employing a multi‐step heat treatment strategy in an air circulating furnace. In this approach, the applied temperature was gradually increased from 200°C to 250°C employing several stages for different stabilization durations. Fifteen percent guanidine carbonate (GC) was found as optimum to incorporate with the PAN precursor fibers to accelerate the thermal‐oxidative stabilization process. Characterization techniques, including X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FT‐IR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), tensile strength, volume density, linear density, fiber thickness, and burning test have been performed to monitor the changes in PAN structure. Test results of the stabilized samples were compared with the reference sample results to demonstrate the accelerating effect of GC integration. Findings showed that GC pretreatment enhanced and accelerated the cyclization of nitrile groups in the PAN polymer structure and allowed the quicker formation of a thermally stable structure. The analysis of the experimental results revealed that GC integration and employing the multi‐step heat treatment strategy helps greatly to cut the overall PAN‐based carbon fiber production cost.

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Acrylic Fibers

Cited by 9 publications

References 204 publications

Effect of process parameters on properties of wet‐spun poly(L,D‐lactide) copolymer multifilament fibers

Effect of process parameters on properties of wet‐spun poly(L,D‐lactide) copolymer multifilament fibers

Effect of hot drawing on properties of wet‐spun poly(L,D‐lactide) copolymer multifilament fibers

The impact of guanidine carbonate incorporation on the molecular structure of polyacrylonitrile precursor fiber stabilized by a multistep heat treatment strategy

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