US 11,859,315 B1
Fabrication of multifunctional BN fine fibers by force spinning method
Maricela Lizcano, Cleveland, OH (US); and Diana Santiago-Dejesus, Cleveland, OH (US)
Assigned to United States of America as Represented by the Administrator of National Aeronautics and Space Administration, Washington, DC (US)
Filed by United States of America as represented by the Administrator of NASA, Washington, DC (US)
Filed on Jan. 24, 2022, as Appl. No. 17/582,329.
Claims priority of provisional application 63/140,395, filed on Jan. 22, 2021.
Int. Cl. B29C 41/04 (2006.01); B29C 71/04 (2006.01); C04B 35/583 (2006.01); D01D 1/02 (2006.01); D01D 1/04 (2006.01); D01D 5/40 (2006.01); D01D 10/02 (2006.01); D01D 5/18 (2006.01); D01F 9/10 (2006.01); C04B 35/622 (2006.01); C04B 41/00 (2006.01)
CPC D01D 5/18 (2013.01) [B29C 41/042 (2013.01); C04B 35/6229 (2013.01); C04B 41/0045 (2013.01); D01F 9/10 (2013.01); C04B 2235/658 (2013.01); C04B 2235/661 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of preparing hexagonal boron nitride (h-BN) fibers comprising:
mixing polyvinylpyrrolidone (PVP) and boron oxide (B2O3) to form a polymer precursor or mixing PVP and ammonia borane (BH3NH3) to form the polymer precursor;
forcespinning the polymer precursor to form fibers of the polymer precursor;
curing the fibers to form polymer fibers; and
pyrolyzing the polymer fibers to form the h-BN fibers.