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Morphology and Phase Characteristics of High‐Density Polyethylene Probed by NMR Spin Diffusion and Second Moment Analysis
Author(s) -
Lili Zhang,
Chen Qun,
Hansen Eddy W.
Publication year - 2005
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200400343
Subject(s) - spin diffusion , crystallinity , pulse sequence , polyethylene , dipole , polarization (electrochemistry) , materials science , sequence (biology) , phase (matter) , diffusion , analytical chemistry (journal) , nuclear magnetic resonance spectroscopy , chemistry , nuclear magnetic resonance , crystallography , physics , stereochemistry , thermodynamics , organic chemistry , composite material , biochemistry
Summary: A dipolar filter pulse sequence combined with cross‐polarization‐MAS is applied to characterize the phase distribution, morphology, and spin diffusion within a high‐density polyethylene sample. A new method to obtain quantitative 13 C NMR by combining cross‐polarization‐MAS and spin diffusion NMR is presented. The derived crystallinity is consistent with the corresponding crystallinity obtained by 1 H NMR.Illustration of the pulse sequence(s) applied in the present work.