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The change of the superstructure of semicrystalline polymers during deformation: results from small‐angle scattering with synchrotron radiation
Author(s) -
Wilke Wolfgang,
Bratrich Michael,
Heise Bernd,
Peichel Gerhard
Publication year - 1992
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1992.220030405
Subject(s) - superstructure , materials science , polyethylene , crystallinity , lamellar structure , deformation (meteorology) , synchrotron radiation , synchrotron , composite material , scattering , polymer , small angle x ray scattering , optics , structural engineering , physics , engineering
The change of the superstructure of different polyethylenes during uniaxial deformation is investigated. The method used is small‐angle scattering with synchrotron radiation. For branched polyethylene (Lupolen 1840D) the whole deformation range is analyzed. Beginning with superstructure of the lamellar cluster type, the superstructure partly disappears on a time scale of a few minutes and the fibrillar structure is built up. The degree of destruction and rebuilding depends on the drawing temperature. For very high molecular weight polyethylene (GUR) a reversible change of the superstructure at higher deformation ratios and at different temperatures is observed. The superstructure of (ethylene—hexene) copolymers (TIPELIN) at high draw ratios depends on the drawing temperature and is almost independent of the side group content. Interfibrillar microcracks parallel to the draw direction are produced in samples with a low side group content for draw ratios λ ≥ 1.5.