Web16 Jan 2024 · A shish-kebab polymer crystal usually consists of a central fibril ( shish) and disk-shaped folded-chain lamellae ( kebab) oriented perpendicularly to the shish as … Webthe shish-kebab structure is a long and macroscopically smooth extended-chain crystalline assembly, which orig-inates from the oriented and/or extended chains under flow. The shish provides nucleating sites (or primary nuclei) for lateral growth of folded-chain crystals or kebabs. In the 1970s, a great deal of effort was devoted to elucidate the
Polymer crystallization under flow - Kyoto U
Web13 May 2024 · The formation of shish-kebab crystallites can be divided into three stages: the emergence of precursors, evolution from precursors to shish nuclei, and the formation of lamellar crystallites. The results demonstrated that the precursors initiated from trans -rich segments with local order and minor crystallinity grew into large shish nuclei and … Web9 Apr 2024 · The membrane samples M4 and M5 also contained regions of ca. 50–100 microns in size, with the structure significantly different from the main structure of the sample (see the bottom two images in the right column). These regions contained “shish-kebab” structures that were obviously absent in the initial structure of the film. dvd english color version little women
Molecular dynamics simulation of shish-kebab crystallization of ...
Web11 Oct 2024 · The flow-induced formation and relaxation of the representative oriented shish-kebab structure were studied with synchrotron small-angle X-ray scattering (SAXS) method. The flow duration was varied from 2 to 6 s at an identical strain rate to reveal the effect of flow time on stability and dimension of formed shish. It was found that the short … WebTheir 2D-WAXD characterisation indicated that a twisted shish-kebab structure was formed for the macro part for HDPE in the shear layer, while an untwisted shish-kebab structure occupied the shear zone of the micro part, as shown in Figure 18. The formation of such morphology was attributed to the degree of lamella stretch, which was affected by the … Web8 Dec 2016 · Above a critical shear stress (σ* ∼ 0.11 MPa) in the rotational rheometer, the morphology transitions to a shish-kebab structure. Shish appear in micrographs as highly aligned birefringent regions; in DSC, flow-induced shish further accelerate the onset of crystallization. In the rheometer, sheared samples with σ < σ* at 170 °C (above Tm ... dvd encryption software mac