Structural changes in paracrystallites of drawn polyethylene by irradiation

Loboda‐Čačković, J.; Čačković, H.; Hosemann, Benjamin

doi:10.1007/bf01554499

Cited by 30 publications

(4 citation statements)

References 5 publications

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“…For solid state irradiated, drawn polyethylene a behaviour is reported resembling to that of branched one [5,23]. Irradiation should cause especially crosslinking of the chains within the crystalline regions.…”

Section: Network Structure and Network Homovgneit~mentioning

confidence: 84%

See 1 more Smart Citation

Crystalline and supermolecular structures in linear polyethylene irradiated with fast electrons

Gielenz

Jungnickel

1982

Colloid & Polymer Sci

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A report is given of structural investigations on high molecular weight, highly linear polyethylene crosslinked by irradiation with fast electrons in both the molten and the solid state. For the melt-irradiated samples it could be concluded from X-ray measurements that insertion of lattice distortions of the first kind occurs on crystallization.The density of these distortions shows a distinct maximum for an irradiation dose of 25 Mrad. It is assumed, that for lower doses the material crystallizes according to a folding procedure, for higher doses according to a micellar one. For solid state irradiated samples crystalline structure and morphology are not influenced measurably by the crosslinking. The recrystallization behaviour is independent on the dose for the resulting inhomogeneous network.

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Section: Network Structure and Network Homovgneit~mentioning

confidence: 84%

“…Other authors report increasing lattice distortions of the second kind after crosslinking a solid sample with y-radiation, these distortions being due to the insertion of crosslinks in the (110) planes. These authors also conclude that there is a negligible crosslinking probability in the amorphous regions [5].…”

Section: K454mentioning

confidence: 91%

Crystalline and supermolecular structures in linear polyethylene irradiated with fast electrons

Gielenz

Jungnickel

1982

Colloid & Polymer Sci

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“…[11][12][13][14][15][16][17][18][19][20] The property improvement occurs not only in irradiated polymers but also in composites containing such polymers. [11][12][13][14][15][16][17][18][19][20] The property improvement occurs not only in irradiated polymers but also in composites containing such polymers.…”

Section: Introductionmentioning

confidence: 99%

Long-term irradiation effects on gamma-irradiated Nylon 6,12 fibers

et al. 2008

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Long-term effects on Nylon 6,12 crystalline fibers irradiated six years ago have been determined, including chemical structure and morphology, and their relationship with storage time. Results from x-ray diffraction, small-angle x-ray scattering, scanning electron microscopy, and atomic force microscopy are reported for those fibers and for freshly irradiated ones. Some results for non-irradiated samples are included for comparison. Changes in the shape and size of the crystals (crystallinity degree) are found; the crystallite size increases with storage time. Both surface and bulk changes are seen in the morphology. Surface damage increases with storage time. Changes observed can be attributed to irradiation causing chain scission, which, in turn, causes crystal reorganization. The present results reinforce interpretation of earlier results obtained for concretes reinforced with irradiated Nylon fibers.

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“…It has been claimed that chain scission occurs either in the amorphous region [Pattel & Keller, 1975;Jenkins & Keller, 1975;Ungar & Keller, 1980] or inside the crystals [Hoseman et al, 1972;Loboda-Cackovic et al, 1974]. Also it was reported that both process begin with the formation of free radicals [Timus et al, 2000;Valenza et al, 1999;Bittner et al, 1999] followed by the Compton Effect [Bittner et al, 1999;Yu & Li, 1998].…”

Section: Gamma Radiation 92mentioning

confidence: 99%