Method for analyzing infrared spectroscopy spectrum of polyacrylonitrile-based fiber

A method for characterizing a polyacrylonitrile-based fiber, the method comprising:

• 1) measuring an infrared spectroscopy spectrum of an inspection target to which an attenuated total reflection method is applied;
• and
• 2) correcting a C≡N peak height in the infrared spectroscopy spectrum through Equations 1 and 2 below using the measured spectrum:
• Peak
• 
• 
• height
• 
• 
• correction
• 
• 
• value
• =
• B
• 2
• C
• [
• Equation
• 
• 
• 1
• ]
• C
• =
• A
• 2
• -
• (
• A
• 1
• ×
• B
• 2
• B
• 1
• )
• A
• 0
• [
• Equation
• 
• 
• 2
• ]
• in Equations 1 and 2,
• A0, A1, A2, B1 and B2 are respective measured peak height values of the infrared spectroscopy spectrum,
• A0 is a C—H peak height of a nonvolatile liquid material,
• A1 is a C—H peak height of a polyacrylonitrile-based fiber,
• A2 is a C—H peak height of the polyacrylonitrile-based fiber infiltrated by the nonvolatile liquid material,
• B1 is a C≡N peak height of the polyacrylonitrile-based fiber, and
• B2 is a C≡N peak height of the polyacrylonitrile-based fiber infiltrated by the nonvolatile liquid material,
• wherein the nonvolatile liquid material is one or more selected from:
• paraffin oil, aliphatic ester compounds, aliphatic ether compounds, and aliphatic alcoholic compounds.