Journal ArticleDOI
Morphological Changes during Secondary Crystallization and Subsequent Melting in Poly(ether ether ketone) as Studied by Real Time Small Angle X-ray Scattering
TLDR
In this paper, the results of morphological studies during long time melt crystallization and subsequent melting in poly(aryl ether ether ketone) (PEEK) were monitored via small angle X-ray scattering (SAXS).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 A vs 120 A), and the amorphous layer thicknesses are about 47 A in both stacks. (3) The low endotherm observed during a heating scan is associated with the melting of the secondary lamellae. (4) At room temperatu...read more
Citations
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Thermal analysis of the double-melting behavior of poly(L-lactic acid)
TL;DR: In this paper, the melting and crystallization behavior of poly(L-lactic acid) (PLLA; weight-average molecular weight = 3 × 105) was studied with differential scanning calorimetry (DSC).
Journal ArticleDOI
Secondary structure and elevated temperature crystallite morphology of nylon-6/layered silicate nanocomposites
TL;DR: In this paper, the secondary structure arising from association of layered silicates is quantified and its impact, along with constituent interactions, on elevated temperature crystallite morphology in nylon-6/montmorillonite nanocomposites is examined.
Journal ArticleDOI
Application of small-angle X-ray and neutron scattering techniques to the characterisation of starch structure: A review
TL;DR: The most significant achievement of small-angle scattering techniques in starch science has been the quantification of the lamellar architecture of semicrystalline growth rings in native starch granules.
Journal ArticleDOI
Differential scanning calorimetry studies on poly(ethylene glycol) with different molecular weights for thermal energy storage materials
TL;DR: In this article, the melting and crystallization behavior of poly(ethylene glycol) (PEG) with different molecular weights and chosen blends of PEG is investigated by means of differential scanning calorimetry (DSC) operating in dynamic mode at different heating rates.
Journal ArticleDOI
Structure and morphology changes during in vitro degradation of electrospun poly(glycolide-co-lactide) nanofiber membrane.
TL;DR: Electrospun poly(glycolide-co-lactide) biodegradable nanofiber membranes possessed very high surface area to volume ratios and were completely noncrystalline with a relatively lowered glass transition temperature, which led to very different structure, morphology, and property changes during in vitro degradation, which were examined systematically.
References
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Journal ArticleDOI
The Nature of the Glassy State and the Behavior of Liquids at Low Temperatures.
Journal ArticleDOI
Nature of the Glass Transition and the Glassy State
TL;DR: In this paper, a second-order transition is predicted for linear molecular chains, which occurs at a temperature which is an increasing function of both chain stiffness and chain length and a decreasing function of free volume.
Journal ArticleDOI
The morphology of poly(aryl-ether-ether-ketone)
D.J. Blundell,B.N. Osborn +1 more
TL;DR: The morphology and related properties for the aromatic thermoplastic poly(aryl-ether-etherketone) (PEEK) [C6H4O C6H 4 O OC 6H4-CO]n were described in this article, including crystallinity, crystallization and melting behaviour, Iamellar thickness and spherulitic structure.
Journal ArticleDOI
Direct evaluation of the electron density correlation function of partially crystalline polymers
Gert Strobl,M. J. Schneider +1 more
TL;DR: In this article, a discussion of the general properties of the one-dimensional electron density correlation function K(z) of a partially crystalline polymer with lamellar structure is presented.
Journal ArticleDOI
Crystallization behaviour of poly(ether-ether-ketone)
Peggy Cebe,S. D. Hong +1 more
TL;DR: In this article, a study has been made of the crystallization behavior of poly(ether-ether-ketone), PEEK, under isothermal and non-isothermal conditions.
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