Abstract
Polyacrylonitrile (PAN) fiber is the best precursor for carbon fibers due to high carbon content after heat treatment. After the polymer was spun into fibers, the fibers will undergo pretreatment process with chemical solution known as post spinning treatment. Post spinning will directly affect conversion of PAN fiber to carbon fiber. Oleic acid was used as post spinning treatment chemical solution to PAN fibers. The pretreated PAN fiber will be heated at 250 o C and 800 o C. The fibers were studied using Fourier Transform Infra-Red (FTIR), X-ray Photoelectron Spectroscopy (XPS) and DSC to study the chemical change during heat treatment. PAN fibers treated with oleic acid have reduced the cyclization energy and increase oxygen and carbon content leading to high performance carbon fibers.
Highlights
Carbon fiber was used in high performance composite due to excellence weigh to strength ratio
Previous study shows fatty acid derivatives react as coating agent to reduce the entangling, fluffy, fusion and fiber to fiber adhesion of the PAN precursor fibers during thermal stabilization process [7]
PAN fiber treated with oleic acid and heated at 800oC has additional peak at 1570 cm-1 which was referred to N-H bending in amide group
Summary
Compound Methyl acrylate was often used as commoner in PAN polymer to produce the fibers.PAN fibers treated with oleic acid and heated at 250oC show interesting FTIR spectra pattern. At 2924 cm-1, sharp and high intensity peak referred to methylene (CH2) was recorded in the spectra This may due to methylene (CH2) coming from oleic acid attach to stabilized PAN fibers surface. PAN fibers treated with oleic acid and heated at 250oC show additional peaks at 724 and 942 cm-1 and was referred to rocking CH2 and NO formation.Figure 2 show FTIR spectral comparison between PAN fiber before and after heated at 800oC. PAN fiber treated with oleic acid and heated at 800oC has additional peak at 1570 cm-1 which was referred to N-H bending in amide group.
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