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Structural changes of bulk polyethylene by stress impact as studied by solid‐state NMR
Author(s) -
Satoh Hidenori,
Kuroki Shigeki,
Ando Isao
Publication year - 2001
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.2074
Subject(s) - orthorhombic crystal system , materials science , polyethylene , monoclinic crystal system , stress (linguistics) , stress relaxation , relaxation (psychology) , solid state , component (thermodynamics) , solid state nuclear magnetic resonance , characterization (materials science) , izod impact strength test , crystallography , composite material , chemistry , crystal structure , nuclear magnetic resonance , thermodynamics , nanotechnology , ultimate tensile strength , physics , psychology , social psychology , linguistics , philosophy , creep
Solid‐state 13 C‐ and 1 H‐NMR spectra of bulk high‐density polyethylene samples, cylindrical in form, to which stress impacts were applied with a home‐made stress‐impact apparatus, were measured. The fraction of the noncrystalline component increases with an increase in the stress‐impact strength. In the crystalline region, the monoclinic crystalline component appear with the stress impact, in addition to the major orthorhombic crystalline component. Furthermore, dynamic characterization was carried out on the basis of the observed values of the relaxation parameters 1 H T 2 and T CH of the 1 H and 13 C nuclei. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 2268–2272, 2001