TITLE

Early oriented isothermal crystallization of polyethylene studied by high-time-resolution SAXS/WAXS

AUTHOR(S)
Stribeck, N.; Camarillo, A. Almendarez; Nöchel, U.; Bösecke, P.; Bayer, R. K.
PUB. DATE
January 2007
SOURCE
Analytical & Bioanalytical Chemistry;Jan2007, Vol. 387 Issue 2, p649
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
During cooling from the quiescent melt of a highly oriented polyethylene rod, highly oriented proto-lamellae are formed first, which are not crystalline. This is shown in scattering data which are recorded on two-dimensional detectors with a cycle time of 1 s and an exposure of 0.1 s. In the experiments small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS) are registered simultaneously during the first 3 min after quenching to a crystallization temperature. A non-uniform thickness between 20 and 100 nm is characteristic for the ensemble of proto-lamellae. During the first minute of isothermal treatment the number of proto-lamellae slowly increases without a change of the thickness distribution. As crystallization starts, the crystallites are not oriented in contrast to the proto-lamellae. During crystallization the layer thickness distribution narrows. The number of lamellae rapidly increases during the following 2 min of isothermal treatment (at 128 °C and 124 °C). The results are obtained by interpretation of the WAXS and of the multidimensional chord distribution function (CDF), a model-free real-space visualization of the nanostructure information contained in the SAXS data.
ACCESSION #
23616529

 

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