Investigation of the superstructure of polymers during deformation by synchrotron radiation

Wilke, W.; Bratrich, Michael

doi:10.1107/s0021889890013243

Cited by 28 publications

(20 citation statements)

References 18 publications

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“…Such an effect has frequently been found after a drawing of polymer materials. [43][44][45][46][47][48][49] MFC7 is very close to local fiber symmetry. Thus, application of XSF-CT results in almost perfect reconstruction of the nanostructure.…”

Section: Discussionmentioning

confidence: 99%

SAXS-Fiber Computer Tomography. Method Enhancement and Analysis of Microfibrillar-Reinforced Composite Precursors from PEBA and PET

et al. 2008

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The nanostructure gradient along the fiber radius inside polymer strands is uncovered by smallangle X-ray scattering (SAXS) microbeam-scanning experiments and X-ray scattering fiber computer-tomography (XSF-CT) analysis. We notice restricted visibility of scattering features within the series of patterns. The reason is violation of local fiber symmetry (LFS) in the irradiated volume elements (voxels). For its theoretical treatment, a set of elementary topologies (tangential grain, radial grain) is introduced. Systematic aberrations (ultrareconstruction, infrareconstruction) generated by tomographic reconstruction of affected series are described. A concept for handling and utilization of these aberrations for nanostructure analysis is devised. Precursors of polymer microfibrillar-reinforced composites (MFC) containing poly(ether)-block-amide (PEBA) and poly(ethylene terephthalate) (PET) with varying cold-draw ratio are studied. We compare results from a direct analysis of the smeared measured patterns to results obtained after tomographic reconstruction and fathom the power of reconstruction methods. Ideas for advanced practical applications of the XSF-CT method are discussed.

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Section: Discussionmentioning

confidence: 99%

SAXS-Fiber Computer Tomography. Method Enhancement and Analysis of Microfibrillar-Reinforced Composite Precursors from PEBA and PET

et al. 2008

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“…Instead, the cylinders form a cluster with 3D short-range correlation. Such structural entities have been called a macrolattice by Wilke [61,62]. The discussed peaks carry positive sign, because they describe chords that reach from the front face of a cylinder to the back face of a neighboring domain.…”

Section: Example Of a Cdf Analysismentioning

confidence: 99%

Scattering of Soft Condensed Matter: From Fundaments to Application

Stribeck¹

2009

Applications of Synchrotron Light to Scattering and Diffraction in Materials and Life Sciences

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Scattering data recorded in experiments on soft condensed matter are resulting in continuous scattering patterns which must be processed for structure analysis. The review presents scattering theory as a tool box with examples that show how to use it in practice. For some of the operations commented source code for computer programming is given. The focus is on the application to polymer and related materials.

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“…The SAXS patterns are rather more striking, and show the distortion of the lamellae into a V-shaped structure (Wilke & Bratrich, 1991) revealed by a four-point pattern (frame 5) at a draw ratio of 2:1. This is followed by destruction of lamellae and transition to a fibrillar structure (frame 20) with a long period of ,-~215/~.…”

Section: Drawing Of Ldpementioning

confidence: 99%

Time-Resolved Simultaneous SAXS/WAXS of the Drawing of Polyethylene at the Daresbury SRS

Hughes¹,

Mahendrasingam²,

Heeley³

et al. 1996

J Synchrotron Radiat

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A system has been developed which represents a significant advance in the quality and extent of small-and wide-angle X-ray scattering data (SAXS and WAXS) that can be recorded simultaneously with strain data during the drawing and annealing of polymer materials. WAXS data are recorded using a Photonic Science charge-coupled-device area detector and SAXS data using a gas-filled multiwire area detector. Strain data, for the region of the specimen from which the SAXS/WAXS data are collected, are calculated from an accurately synchronized continuously recorded video image of the specimen. The system allows X-ray and video image data to be collected as a series of frames with essentially no 'dead-time' between frames. The data are fully two-dimensional and can be collected for a wide range of d spacings. The use of this system to investigate the stress-induced orientation and phase changes during the drawing of a range of grades of commercially available polyethylene is described.

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Investigation of the superstructure of polymers during deformation by synchrotron radiation

Cited by 28 publications

References 18 publications

SAXS-Fiber Computer Tomography. Method Enhancement and Analysis of Microfibrillar-Reinforced Composite Precursors from PEBA and PET

SAXS-Fiber Computer Tomography. Method Enhancement and Analysis of Microfibrillar-Reinforced Composite Precursors from PEBA and PET

Scattering of Soft Condensed Matter: From Fundaments to Application

Time-Resolved Simultaneous SAXS/WAXS of the Drawing of Polyethylene at the Daresbury SRS

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