Spherulitic growth kinetics in miscible blends of poly(ether ether ketone) and poly(ether imide) |
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Authors: | Hsin-Lung Chen Roger S Porter |
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Affiliation: | (1) Department of Chemical Engineering, National Tsing Hua University, Hsin-Chu, 30013, Taiwan, R.O.C.;(2) Polymer Science and Engineering Department, University of Massachusetts, Amherst, MA 01003, USA |
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Abstract: | Growths of poly(ether ether ketone) (PEEK) spherulites from both pure melt and its miscible blends with poly(ether imide)
(PEI) have been studied by polarized optical microscopy. The nucleation density of PEEK spherulites was depressed upon blending
with PEI, which can be attributed to the reduction in degree of supercooling arising from equilibrium melting point depression.
A modified Lauritzen-Hoffman (L-H) theory was adopted to analyze the growth kinetics. Regime III-II transition was observed
with the transition temperature decreasing with increasing PEI composition. Assuming free rotations of the virtual bonds in
PEEK molecule, the side surface free energy of 12.0 erg/cm2 was calculated from the characteristic ratio. The fold surface free energy of 188 erg/cm2 and work of chain folding of 12.3 kcal/mol were then obtained from the modified L-H analysis. |
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Keywords: | Poly(ether ether ketone) Poly(ether imide) Blend Spherulite growth rate Surface free energy |
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