Scanning Force Microscopy on the Orientation of Gel‐Crystallized Ultrahigh Molecular Weight Polyethylene

Sheiko, S.; Möller, Martin

doi:10.1002/9783527615056.ch7

Oriented Polymer Materials 1996

DOI: 10.1002/9783527615056.ch7

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Scanning Force Microscopy on the Orientation of Gel‐Crystallized Ultrahigh Molecular Weight Polyethylene

S. Sheiko¹,

Martin Möller²

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2003

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Cited by 1 publication

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Straight‐Chain Segment Length Distribution in Oriented Polyethylene as Revealed by LAM-Raman Spectroscopy

Marikhin

Myasnikova

Tsobkallo

et al. 2003

Journal of Macromolecular Science, Part B

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With the help of low-frequency Raman spectroscopy, the peculiarity of structural organization of oriented PE produced by multistage zone drawing of melt-crystallized films was studied. The draw ratios varied from DR ¼ 6 to 21 for PEI with M h ¼ 8·10 4 and from 3.5 to 5.7 for PEII with M h < 10 6 :The half widths (Dn) of all observed LAM bands were larger than 10 -20 cm 21 . This means that the bands comprise a continuum of the overlapped elementary bands with Dn < 3 cm 21 because of the wide straight -chain segments (SCS) length distribution. The length (L) of straight segments calculated from LAM-spectra, following a routine procedure, lies in the range from 7 -8 to 60 nm.Weight fractions G MW of the SCS, as functions of their length, have a bell-like shape. Comparison of the SCS lengths with the value of the long periods (D) inferred from SAXS data for the same samples indicates that the lengths do not exceed 2D. The structural interpretation of the data obtained is given on the basis of microfibrillar models of oriented polymers. The peculiarity of the microfibrillar structure in PEI and PEII samples such as crystallite sizes and shapes and concentrations of inter-and intrafibrillar tie molecules, manifest themselves as the shape of G MW (L) functions obtained for PE samples of various M w and DR.

show abstract

Straight‐Chain Segment Length Distribution in Oriented Polyethylene as Revealed by LAM-Raman Spectroscopy

Marikhin

Myasnikova

Tsobkallo

et al. 2003

Journal of Macromolecular Science, Part B

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show abstract

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Scanning Force Microscopy on the Orientation of Gel‐Crystallized Ultrahigh Molecular Weight Polyethylene

Cited by 1 publication

References 82 publications

Straight‐Chain Segment Length Distribution in Oriented Polyethylene as Revealed by LAM-Raman Spectroscopy

Straight‐Chain Segment Length Distribution in Oriented Polyethylene as Revealed by LAM-Raman Spectroscopy

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