Restricted segmental mobility can facilitate medium-range chain diffusion: A NMR study of morphological influence on chain dynamics of polyethylene
作者： Y.-F. Yao , R. Graf , H. W. Spiess , S. Rastogi
DOI: 10.1021/MA702815K
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摘要: The influence of the morphology on local motion in noncrystalline regions and chain diffusion between crystalline is studied ultrahigh molecular weight linear polyethylene: behaviors samples same material crystallized from melt solution are compared. geometrical restrictions conformational transitions probed via anisotropic NMR interactions, i.e., 13C−1H dipole–dipole couplings 13C chemical shift anisotropy. As they averaged out under MAS, recoupling techniques applied to yield sideband patterns or quasi-static spectra, which residual anisotropies determined. Chain by exchange NMR. expected, more restricted sample compared with one. Moreover, motional narrowing observed both indicates that mobility s...
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