Patent ID: 9096955
Filing Date: 2015-08-04
Classification: D01D,D01F,D06M,D10B,Y10T

Abstract:
1. A method for the preparation of carbon fiber from polyolefin fiber precursor, the method comprising partially sulfonating said polyolefin fiber precursor to produce a partially sulfonated polyolefin fiber, and subjecting said partially sulfonated polyolefin fiber to carbonization conditions to produce said carbon fiber, wherein partial sulfonation of said polyolefin precursor fiber produces a surface-sulfonated polyolefin fiber by sulfonating a surface layer of said polyolefin fiber precursor while leaving a core portion of said polyolefin fiber precursor unsulfonated, wherein subsequent carbonization volatilizes the unsulfonated core portion and carbonizes the surface-sulfonated portion to produce a hollow carbon fiber.