Molecular Weight Distribution Characteristics (of a Polymer) Derived from a Stretched-Exponential PGSTE NMR Response FunctionuSimulation

被引：12

作者：

Gong, Xiaoliang ^{[2
,3
]}

Hansen, Eddy W. ^{[1
]}

Chen, Qun ^{[2
,3
]}

机构：

[1] Univ Oslo, Dept Chem, N-0315 Oslo, Norway

[2] E China Normal Univ, Dept Phys, Shanghai 200062, Peoples R China

[3] E China Normal Univ, Shanghai Key Lab Magnet Resonance, Shanghai 200062, Peoples R China

来源：

MACROMOLECULAR CHEMISTRY AND PHYSICS | 2012年 / 213卷 / 03期

关键词：

diffusion; molecular weight distribution; PFGNMR; stretched-exponential function; simulations; SELF-DIFFUSION; SPECTROSCOPY; TIME;

D O I：

10.1002/macp.201100528

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Assuming the signal response in a pulsed gradient stimulated echo (PGSTE) experiment (on a polymer) to be described by a simple stretched-exponential function (SEF) and knowing the scaling law between diffusivity and molecular weight, the molecular weight distribution (MWD) characteristics (kurtosis, skewness, moment, and width) are derived and compared to the corresponding distribution characteristics obtained by a log-normal function fit (to the same MWD). Also, the challenge involved in obtaining a reliable weight average molecular weight from an SEF response function is discussed.

引用

页码：278 / 284

页数：7

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