Dry Spinning of Polymer Fibers in Ternary Systems

2004 ◽  
Vol 19 (3) ◽  
pp. 244-253 ◽  
Author(s):  
Z. Gou ◽  
A. J. McHugh
Keyword(s):  
Ternary Systems ◽  
Polymer Fibers ◽  
Dry Spinning

Dry Spinning of Polymer Fibers in Ternary Systems

2004 ◽  
Vol 19 (3) ◽  
pp. 254-261 ◽  
Author(s):  
Z. Gou ◽  
A. J. McHugh
Keyword(s):  
Ternary Systems ◽  
Polymer Fibers ◽  
Dry Spinning

Polymer-Derived Silicon Carbide Fibers with Improved Thermomechanical Stability

1992 ◽  
Vol 271 ◽  
Author(s):  
W. Toreki ◽  
C. D. Batich ◽  
M. D. Sacks ◽  
M. Saleem ◽  
G. J. Choi
Keyword(s):  
Silicon Carbide ◽  
Polymer Fibers ◽  
Low Oxygen ◽  
X Ray Diffraction ◽  
Silicon Carbide Fibers ◽  
Surface Areas ◽  
Weight Losses ◽  
Dry Spinning ◽  
Scanning Auger Microprobe ◽  
Strength Retention

ABSTRACTContinuous silicon carbide fibers (”UF fibers”) with low oxygen content (∼2 wt%) were prepared by dry spinning of high molecular weight polycarbosilane solutions and subsequent pyrolysis of the polymer fibers. Room temperature mechanical properties were similar to those of commercially-available Nicalon™ fibers, as average tensile strengths as high as 3 GPa were obtained for some batches with fiber diameters in the range ∼10–15 μm Furthermore, UF fibers showed significantly better thermomechanical stability compared to Nicalon™, as indicated by lower weight losses, lower specific surface areas, and improved strength retention after heat treatment at temperatures up to 1700°C. UF fibers were also characterized by elemental analysis, X-ray diffraction, and scanning Auger microprobe. Strategies were suggested for achieving further improvements in thermomechanical stability.

Characterization of micromanipulator-controlled dry spinning of micro- and sub-microscale polymer fibers

2006 ◽  
Vol 16 (9) ◽  
pp. 1825-1832 ◽  
Author(s):  
Scott M Berry ◽  
Steven A Harfenist ◽  
Robert W Cohn ◽  
Robert S Keynton
Keyword(s):  
Polymer Fibers ◽  
Dry Spinning

Polarized microbeam FT-IR analysis of single fibers

1996 ◽  
Vol 54 ◽  
pp. 206-207
Author(s):  
Liling Cho ◽  
David L. Wetzel
Keyword(s):  
Molecular Orientation ◽  
Transition Point ◽  
Polymer Fibers ◽  
Single Fiber ◽  
Wire Grid ◽  
Polyester Fibers ◽  
Ft Ir ◽  
Ir Analysis ◽  
The Relationship ◽  
Wire Grid Polarizer

Polarized infrared microscopy has been used for forensic purposes to differentiate among polymer fibers. Dichroism can be used to compare and discriminate between different polyester fibers, including those composed of polyethylene terephthalate that are frequently encountered during criminal casework. In the fiber manufacturering process, fibers are drawn to develop molecular orientation and crystallinity. Macromolecular chains are oriented with respect to the long axis of the fiber. It is desirable to determine the relationship between the molecular orientation and stretching properties. This is particularly useful on a single fiber basis. Polarized spectroscopic differences observed from a single fiber are proposed to reveal the extent of molecular orientation within that single fiber. In the work presented, we compared the dichroic ratio between unstretched and stretched polyester fibers, and the transition point between the two forms of the same fiber. These techniques were applied to different polyester fibers. A fiber stretching device was fabricated for use on the instrument (IRμs, Spectra-Tech) stage. Tension was applied with a micrometer screw until a “neck” was produced in the stretched fiber. Spectra were obtained from an area of 24×48 μm. A wire-grid polarizer was used between the source and the sample.

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