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Morphological Changes during Secondary Crystallization and Subsequent Melting in Poly(ether ether ketone) as Studied by Real Time Small Angle X-ray Scattering
Abstract
In this paper, we present results of morphological studies during long time melt crystallization and subsequent melting in poly(aryl ether ether ketone) (PEEK). Morphological changes were monitored via small angle X-ray scattering (SAXS). SAXS data were analyzed via a combination of the correlation and interface distribution functions. Our analysis indicates the following: (1) The semicrystalline morphology is best described by a three-phase, dual lamellar stack model. Stacks of a finite number of lamellae and interlamellar amorphous layers are separated from each other by interstack regions of amorphous material (liquid pockets). (2) Secondary crystallization occurs via the formation of secondary lamellar stacks within the liquid pockets. Secondary lamellae are thinner than primary lamellae (70 Å vs 120 Å), and the amorphous layer thicknesses are about 47 Å in both stacks. (3) The low endotherm observed during a heating scan is associated with the melting of the secondary lamellae. (4) At room temperature, the semicrystalline PEEK material is in a state of dilational stress (negative hydrostatic pressure) which may originate from the secondary crystallization process in constrained liquid pockets.
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Cited by
Thermal analysis of the double‐melting behavior of poly(L‐lactic acid)
Yasuniwa, M., Tsubakihara, S., Sugimoto, Y., & Nakafuku, C. (2004) · Journal of Polymer Science Part B: Polymer Physics · doi:10.1002/polb.10674 · Cited by 375
Marand, H., Xu, J., & Srinivas, S. (1998) · Macromolecules · doi:10.1021/ma980747y · Cited by 302
Self-citationHigh-performance nanocomposites based on polyetherketones
Díez-Pascual, A. M., Naffakh, M., Marco, C., Ellis, G., & Gómez-Fatou, M. A. (2012) · Progress in Materials Science · doi:10.1016/j.pmatsci.2012.03.003 · Cited by 289
A β-Form Crystal Modification of Poly(glycolic acid): Formation, Stabilization, and β–α Transition
Niu, D., Wang, H., Ma, Y., Xu, P., Li, J., Yang, W., Liu, T., Tashiro, K., Lemstra, P. J., & Ma, P. (2023) · Macromolecules · doi:10.1021/acs.macromol.3c01168 · Cited by 40
Wang, Z.-G., Wang, X., Hsiao, B. S., Andjelić, S., Jamiolkowski, D., McDivitt, J., Fischer, J., Zhou, J., & Han, C. C. (2001) · Polymer · doi:10.1016/s0032-3861(01)00374-3 · Cited by 37
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Metadata
- Authors
- Verma, R., Marand, H., & Hsiao, B.
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 1996-01-01
- Volume
- 29
- Issue
- 24
- Pages
- 7767-7775
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W2042863855
- Cited by
- 262
- References
- 0
- FWCI
- 10.81
- Type
- journal article
- Language
- en
- Open access
- closed
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- Verma, R., Marand, H., & Hsiao, B. (1996). Morphological Changes during Secondary Crystallization and Subsequent Melting in Poly(ether ether ketone) as Studied by Real Time Small Angle X-ray Scattering. Macromolecules. https://doi.org/10.1021/ma951727o
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