A new approach to coagulation phenomena in wet‐spinning

Rende, A.

doi:10.1002/app.1972.070160305

Cited by 30 publications

(13 citation statements)

References 5 publications

(1 reference statement)

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“…[1][2][3][4] The mathematical models used to explain the diffusion process in wet-spinning are mainly the Moving-Boundary Model and Constant-Flux Ratio Model proposed by Paul. 5,6 In addition, Rende, 7 Liu et al, 8,9 and Knaul and Creber 10 also established similar models to describe the counter-diffusion phenomenon in wet-spinning and obtained similar result. However, the coagulation process in wet-spinning is very complex and there are still many puzzles to be pendent.…”

Section: Introductionsupporting

confidence: 72%

Study on the formation process of polyacrylonitrile as‐spun fiber

Wang

et al. 2007

J of Applied Polymer Sci

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In this article, the coagulation rate of PAN/ DMSO dope was studied by observing the boundary movement of the gelled rods in different coagulation bath. Then the effect of the nature of solvent and coagulant and the coagulation conditions on the coagulation rate was discussed. It was found that the molecular size and molecular structure of coagulants is the most significant variable affecting the coagulation rate. The intermolecular affinity between coagulant and solvent determines the activation energy of coagulants, whereas the molecular volume is not a dominant factor. The coagulation rate depends not only on the diffusion coefficient of coagulants but also the nature of solvents. A solvent with strong polarity usually leads to a low-coagulation rate.

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Section: Introductionsupporting

confidence: 72%

Study on the formation process of polyacrylonitrile as‐spun fiber

Wang

et al. 2007

J of Applied Polymer Sci

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“…3 Because of the dependence of subsequent textile properties of the fiber on its structure, particularly on the regularity of the cross-sectional shape, the integrity of the external skin, and the number and size of voids, accurate knowledge of the phenomena regulating these features is of great importance. 4 To our knowledge, earlier studies were just empirical attempts to correlate the actual spinning variables with the final properties of the fibers, 5,6 without any investigation on the dynamics of the phenomenon, and there is almost no reports on diffusion coefficient of solvent in polyacrylonitrile fiber formation process. In this study, H 2 O/ dimethyl sulfoxide (DMSO) mixture was used as the coagulation bath, acrylonitrile (AN)/ammonium itaconate (AIA) copolymers were used to prepare the spinning dopes.…”

Section: Introductionmentioning

confidence: 99%

Diffusion coefficient of DMSO in polyacrylonitrile fiber formation

Liang

Hou

Fei

2006

J of Applied Polymer Sci

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ABSTRACT:A H 2 O/dimethyl sulfoxide(DMSO) mixture was used as the coagulation bath for the wet-spun process of acrylonitrile/ammonium itaconate copolymers fibers. Diffusion coefficient of DMSO in the protofibers prepared by acrylonitrile/ammonium itaconate copolymers was determined. It has been found that diffusion coefficient of DMSO outflow of the protofibers prepared by acrylonitrile/ammonium itaconate copolymers synthesized by the solution polymerization is highest compared with those of acrylonitrile/ammonium itaconate copolymers synthesized by H 2 O/DMSO mixture suspension polymerization and the aqueous suspension polymerization. With an increase of copolymer concentration in the dope, diffusion coefficient of DMSO decreases continuously. Diffusion coefficient of DMSO increases along with the bath temperature, but the changes of diffusion coefficient values are less prominent as temperature goes beyond 60°C. When DMSO concentration in the coagulation bath was 55 wt %, the value of the diffusion coefficient of DMSO was minimal. Diffusion coefficient of H 2 O increases with the jet stretch minus ratio increasing.

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“…Recent studies using modeling techniques to understand diffusion processes have been reported by Paul [4] and Rende and colleagues. [9] The determination of diffusion coefficients of H 2 O and dimethyl sulphoxide (DMSO) has been reported. [12−14] However, there are still some deficiencies.…”

Section: Introductionmentioning

confidence: 99%

Effect of Coagulation Bath DMSO Concentration on the Structure and Properties of Polyacrylonitrile (PAN) Nascent Fibers during Wet-Spinning

Peng

Zhang

Wen

et al. 2008

Journal of Macromolecular Science, Part B

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Polyacrylonitrile nascent fibers, as spun into the coagulation bath, were prepared by solution polymerization and wet-spinning, and a dimethyl sulphoxide (DMSO)/H 2 O coagulation bath system was adopted. The effect of coagulation bath DMSO concentration on the structure and properties of the nascent fibers was studied in detail, and the diffusion coefficients of DMSO and H 2 O for different bath DMSO concentrations were calculated by Crank's equation to explain the structural changes of the nascent fibers, including cross-section, core/shell structure, and surface morphology. The surface morphology of nascent fibers was observed by field emission scanning electron microscopy (FESEM). The results showed that as the coagulation bath DMSO concentration increased, the diffusion coefficients gradually decreased. More circular cross-section, less core/shell structure, higher degree of crystallinity, larger crystal size, larger bulk density, and higher sound velocity of the nascent fibers were obtained when thecoagulation bath DMSO concentration was 70 wt% compared to lower or higher bath DMSO concentration. Moreover, compared with the nascent fibers spun in other bath DMSO concentrations, smoother surfaces of the nascent fibers were obtained at the bath DMSO concentration of 70 wt%.

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A new approach to coagulation phenomena in wet‐spinning

Cited by 30 publications

References 5 publications

Study on the formation process of polyacrylonitrile as‐spun fiber

Study on the formation process of polyacrylonitrile as‐spun fiber

Diffusion coefficient of DMSO in polyacrylonitrile fiber formation

Effect of Coagulation Bath DMSO Concentration on the Structure and Properties of Polyacrylonitrile (PAN) Nascent Fibers during Wet-Spinning

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