Title of article :
Nanocomposites of poly(ether ether ketone) with carbon nanofibers: Effects of dispersion and thermo-oxidative degradation on development of linear viscoelasticity and crystallinity
Author/Authors :
Modi، نويسنده , , Shriraj H. and Dikovics، نويسنده , , Kimberly B. and Gevgilili، نويسنده , , Halil and Mago، نويسنده , , Gaurav and Bartolucci، نويسنده , , Stephen F. and Fisher، نويسنده , , Frank T. and Kalyon، نويسنده , , Dilhan M. Kalyon، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2010
Pages :
9
From page :
5236
To page :
5244
Abstract :
Poly(ether ether ketone), PEEK, is a widely used engineering plastic that is especially suitable for high temperature applications. Compounding of PEEK with carbon nanofibers, CNF, has the potential of enhancing its mechanical and thermal properties further, even at relatively low CNF concentrations. However, such enhancements can be compromised by myriad factors, some of which are elucidated in this study. Considering that the dispersion of the CNF into any high molecular weight polymer is a challenge, two different processing methods, i.e., melt and solution processing were used to prepare PEEK nanocomposites with low aspect ratio carbon nanofibers. The linear viscoelastic material functions of PEEK nanocomposites in the solid and molten states were characterized as indirect indicators of the dispersion state of the nanofibers and suggested that the dispersion of nanofibers into PEEK becomes difficult at increasing CNF concentrations for both solution and melt processing methods. Furthermore, the time-dependence of the linear viscoelastic material functions of the PEEK/CNF nanocomposites at 360–400 °C indicated that PEEK undergoes thermo-oxidative cross-linking under typical melt processing conditions, thus preventing better dispersion by progressive increases of the mixing time and specific energy input during melt processing. The crystallization behavior of PEEK is also affected by the presence of CNF and degree of cross-linking, with the rate of crystallization decreasing with increasing degree of cross-linking and upon the incorporation of CNFs both for the solution and melt processed PEEK nanocomposites.
Keywords :
PEEK , nanocomposites , Carbon nanofibers
Journal title :
Polymer
Serial Year :
2010
Journal title :
Polymer
Record number :
1736239
Link To Document :
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