Dry-jet wet spinning of aromatic polyamic acid fiber using chemical imidization

Park, Seung Koo; Farris, Richard J.

doi:10.1016/s0032-3861(01)00576-6

Cited by 87 publications

(46 citation statements)

References 7 publications

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“…Solution spinning lines for the dry-jet, wet-spinning process have been described in the literature [14][15][16][17][18][19][20] many times; in this work, fibers were spun using a machine based on a design by Rutledge, Suter, and Papaspyride. [20] A plunger driven by a motor and gear box pressed the spin dope through an orifice into the coagulation bath; 100 and 50 mm orifice diameters were used.…”

Section: Fiber Spinningmentioning

confidence: 99%

“…For PAA fibers, different types of coagulation media have been reported; [2,16,17] the most common are ethanol, ethylene glycol, aqueous solutions thereof, and also aqueous DMAc or DMF. In addition to thermal imidization, PAA is often cyclodehydrated by chemical imidization using acetic anhydride in combination with pyridine [2,19] or triethylamine. [6] To find an optimal coagulation medium, we performed preliminary spinning experiments testing many solvents and mixtures.…”

Section: Fiber Spinningmentioning

confidence: 99%

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Polyimide Fibers Obtained by Spinning Lyotropic Solutions of Rigid‐Rod Aromatic Poly(amic ethyl ester)s

Neuber

Schmidt

Giesa

2006

Macro Materials & Eng

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Summary: Fibers were spun from a lyotropic solution of a high‐molecular‐weight (η = 5.89 g · dL−1), rigid‐rod, fully aromatic polyimide precursor polymer in a dry‐jet, wet‐spinning process in NMP. Acetone was identified as the coagulant of choice since fibers could be drawn extensively in this solvent, resulting in improved mechanical properties (tensile modulus: E = 17 GPa, strength at break: σbreak = 400 MPa, elongation at break: εbreak = 5.3%) and orientation, which was shown by WAXS patterns. SEM images showed a layered, skin‐core morphology without any visible fibrillation. Additional processing of these fibers by step‐wise hot‐drawing up to 400 °C under tension rendered oriented polyimide fibers with excellent mechanical properties. (E = 68 GPa, σbreak = 700 MPa, εbreak = 1%). An analysis of the WAXS diffraction patterns showed an improved orientation of the fibers in the axial and lateral directions; however, probably due to the CF3 side groups, the lateral distance was still too large for crystallization. SEM images of these imidized fibers showed, for the first time, a fibrillar morphology in addition to the typical, skin‐core, sheet‐like morphology.SEM image of the hot‐drawn fiber PI 4 (12). The image shows a skin‐core morphology which was delaminating into ribbons during preparation.magnified imageSEM image of the hot‐drawn fiber PI 4 (12). The image shows a skin‐core morphology which was delaminating into ribbons during preparation.

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Section: Fiber Spinningmentioning

confidence: 99%

Section: Fiber Spinningmentioning

confidence: 99%

Polyimide Fibers Obtained by Spinning Lyotropic Solutions of Rigid‐Rod Aromatic Poly(amic ethyl ester)s

Neuber

Schmidt

Giesa

2006

Macro Materials & Eng

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“…Compared with various conventional methods of obtaining nanofibers (wet spinning, dry spinning, meltblown) (Park and Farris 2001;Qin at al. 2001), solution electrospinning allows for producing nanofibers of much smaller diameter reaching below 100 nm.…”

Section: Introductionmentioning

confidence: 99%

Certain Properties of Cotton Paper with the Addition of Nanofibers in the Form of PLA/PHB Composite

Modzelewska

Patelski

Tyrolczyk

2014

Journal of Natural Fibers

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The purpose of the research was to produce nanofiber-modified paper with enhanced strength. The materials used in the research were cotton-comber pulp and a composite of PLA (polylactic acid) and PHB (polyhydroxybutyrate) nanofibers. Two sets of test sheets were formed: from the pure cottoncomber pulp and from the cotton-comber pulp with 5.5% of ground nanofibers. A range of strength tests showed a significant strength improvement (an increase in breaking length of 17%). The thesis was confirmed and the results encourage further research into the subject matter of this article.

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“…1,2 However, most of these polyimides have the disadvantage of poor solubility and very high glass transition temperature, which make them difficult to process. Consequently, two routes are used for the fabrication of polyimide fibers: [3][4][5] a. The spinning of a precursor polymer solution, such as polyamic acids (PAAs) or polyamic ester (PAE) an so on, followed by chemical or thermal imidization of filaments; b.…”

Section: Introductionmentioning

confidence: 99%

Structure and properties of polyimide (BTDA-TDI/MDI co-polyimide) fibers obtained by wet-spinning

et al. 2011

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BTDA-TDI/MDI (P84, synthesized by the condensation of 2,4-diisocyanato-1-methylbenzene and 1,1'-methylenebis(4-isocyanatobenzene) with 5,5'-carbonylbis(l,3-isobenzofurandione)) co-polyimide fibers were prepared by wet-spinning. The basic spinning conditions were found from the studies of dope viscosity, ternary phase diagrams, coagulation value, and precipitation value. The effect of the coagulation bath composition on the morphology of as-spun fibers was investigated and a theoretical approach was used to understand the coagulation phenomena. Scanning electron microscopy (SEM) showed that the cross-sectional shape of the fiber deviated more from an ellipse shape with the increasement of N-methyl-2-pyrrdidinone (NMP) content. The surface and cross section morphology of the as-spun fibers was also analyzed by the rate of diffusion and phase separation. The as-spun fibers were treated in heating tubes without drawing at different temperatures. The gravimetric analysis spectra showed that the BTDA-TDI/MDI co-polyimide fibers, which had been heat treated at 350 and 400 o C, possessed better thermal properties than the as-spun fibers, a large weight loss was observed only above 550 o C. Heat treatment of the fibers resulted in relatively high tensile strength and modulus. The fibers spun in Bath C (70/30, NMP/water, wt/wt) and Bath D (80/20, NMP/water, wt/wt) showed better thermal properties and higher tensile strength.

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Dry-jet wet spinning of aromatic polyamic acid fiber using chemical imidization

Cited by 87 publications

References 7 publications

Polyimide Fibers Obtained by Spinning Lyotropic Solutions of Rigid‐Rod Aromatic Poly(amic ethyl ester)s

Polyimide Fibers Obtained by Spinning Lyotropic Solutions of Rigid‐Rod Aromatic Poly(amic ethyl ester)s

Certain Properties of Cotton Paper with the Addition of Nanofibers in the Form of PLA/PHB Composite

Structure and properties of polyimide (BTDA-TDI/MDI co-polyimide) fibers obtained by wet-spinning

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