Carbon fiber formed from chlorinated polyvinyl chloride, and method for preparing same

Abstract

Provided is a carbon fiber that has an average fiber diameter of 1-100 μm and is a product obtained by spinning a solution of chlorinated polyvinyl chloride to obtain a chlorinated polyvinyl fiber, elongating the chlorinated polyvinyl fiber without an oxidative stabilization process, and then preheating and carbonizing the elongated polyvinyl chloride fiber. Also, provided is a method for preparing a carbon fiber which has excellent mechanical properties and a high degree of orientation without oxidative stabilization.

1 . A carbon fiber having an average fiber diameter of 1 to 100 μm and prepared by spinning a solution of chlorinated polyvinyl chloride to obtain a chlorinated polyvinyl chloride fiber, elongating the chlorinated polyvinyl chloride fiber without an oxidative stabilization process, and preheating and carbonizing the elongated polyvinyl chloride fiber. 
     
     
         2 . The carbon fiber of  claim 1 , wherein the carbon fiber has the average fiber diameter of 10 to 20 μm, tensile strength of 1000 to 2500 MPa, tensile modulus of 70 to 140 GPa, and a degree of orientation of 60 to 80%. 
     
     
         3 . A method for preparing a carbon fiber having an average fiber diameter of 1 to 100 μm, the method comprising:
 spinning a solution of chlorinated polyvinyl chloride (CPVC) to obtain a chlorinated polyvinyl chloride fiber; 
 elongating the chlorinated polyvinyl chloride fiber without an oxidative stabilization process to prepare an elongated chlorinated polyvinyl chloride fiber; 
 preheating the elongated chlorinated polyvinyl chloride fiber at 150 to 450° C. under an inert gas atmosphere; and 
 carbonizing the preheated product at 950 to 2000° C. 
 
     
     
         4 . The method  claim 3 , wherein a content of chlorine is 57.7 to 84.5 wt % and an average degree of polymerization is 400 to 800 in the chlorinated polyvinyl chloride. 
     
     
         5 . The method  claim 3 , wherein the elongating is performed by elongating the chlorinated polyvinyl chloride fiber at 120 to 150° C. with an elongation rate of 0.01 to 200%. 
     
     
         6 . The method of  claim 3 , wherein the elongating is performed by elongating the chlorinated polyvinyl chloride fiber at 120 to 150° C. with an elongation rate of 100 to 200%. 
     
     
         7 . The method of  claim 3 , wherein an average fiber diameter of the chlorinated polyvinyl chloride fiber is 30 to 100 μm.