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Rheo‐optical studies on the deformation mechanism of semicrystalline polymers. VIII. Dynamic x‐ray diffraction of a high‐density polyethylene film having row‐structure of C‐axis orientation
Author(s) -
Suehiro Shoji,
Yamada Takeshi,
Kyu Thein,
Fujita KenIchi,
Hashimoto Takeji,
Kawai Hiromichi
Publication year - 1979
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760191309
Subject(s) - crystallite , lamellar structure , materials science , diffraction , crystallinity , composite material , texture (cosmology) , lattice (music) , crystallography , condensed matter physics , polyethylene , polymer , dispersion (optics) , crystal (programming language) , optics , physics , chemistry , image (mathematics) , artificial intelligence , computer science , acoustics , metallurgy , programming language
Dynamic x‐ray diffraction is employed to scrutinize the structural origin of the α mechanical dispersion of a highdensity polyethylene having preferentially oriented rownucleated cylindritic texture around the machine direction ( MD ). Results indicate that the α 1 dispersion is associated with two kinds of orientation processes of crystallites: (1) the orientation process involving the rotation of crystallites around the crystal b ‐axis (lamellar axis) dominates in the MD specimen; (2) the other process accompanying the rotation of crystallites or lamellar segments around their crystal a ‐axis dominates in the TD (transverse direction) specimen. The complex apparent crystal lattice compliances show no frequency dependence in the real component and no appreciable value in the imaginary component, indicating that the α 1 process is definitely associated with the intercrystalline process, but not relavent to the intracrystal process. However, at elevated temperatures, the complex lattice compliances exhibit a remarkable frequency dependence, suggesting that the α 2 dispersion concomitant to intracrystalline nature takes place in this time scale. The α 2 dispersion was found to be more pronounced upon stretching along the lamellar axis ( TD ) than normal to it ( MD ).