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Title: Two-step sulfonation process for the conversion of polymer fibers to carbon fibers

Patent ·
OSTI ID:1408915

Disclosed herein are processes for preparing carbon fibers, comprising: sulfonating a polymer fiber with a sulfonating agent that is fuming sulfuric acid, sulfuric acid, chlorosulfonic acid, or a combination thereof; treating the sulfonated polymer with a heated solvent, wherein the temperature of the heated solvent is at least 95.degree. C.; and carbonizing the resulting product by heating it to a temperature of 501-3000.degree. C. Carbon fibers prepared according to these methods are also disclosed herein.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
NFE-10-02991
Assignee:
Dow Global Technologies LLC (Midland, MI)
Patent Number(s):
9,816,207
Application Number:
14/413,454
OSTI ID:
1408915
Resource Relation:
Patent File Date: 2013 Jul 03
Country of Publication:
United States
Language:
English

References (6)

Process for production of carbon fiber patent January 1978
Multi-phase selective mass transfer through a membrane patent August 2013
Amorphous carbon fibres from linear low density polyethylene journal October 1990
The effect of diameter on the mechanical properties of amorphous carbon fibres from linear low density polyethylene journal March 1991
Carbon Fibers from Polyethylene-Based Precursors journal March 1994
Use of sulfonation procedure for the development of thermally stabilized isotactic polypropylene fibers prior to carbonization journal July 2011