Spherulitic growth kinetics in miscible blends of poly(ether ether ketone) and poly(ether imide)

Hsin Lung Chen; Roger S. Porter

doi:10.1007/s10965-006-0067-2

Spherulitic growth kinetics in miscible blends of poly(ether ether ketone) and poly(ether imide)

Hsin Lung Chen, Roger S. Porter

Research output: Contribution to journal › Journal Article › peer-review

7 Scopus citations

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.

Original language	English
Pages (from-to)	21-26
Number of pages	6
Journal	Journal of Polymer Research
Volume	6
Issue number	1
DOIs	https://doi.org/10.1007/s10965-006-0067-2
State	Published - 01 1999
Externally published	Yes

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title = "Spherulitic growth kinetics in miscible blends of poly(ether ether ketone) and poly(ether imide)",

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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T1 - Spherulitic growth kinetics in miscible blends of poly(ether ether ketone) and poly(ether imide)

AU - Chen, Hsin Lung

AU - Porter, Roger S.

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N2 - 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.

AB - 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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Spherulitic growth kinetics in miscible blends of poly(ether ether ketone) and poly(ether imide)

Abstract

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