Polydispersity index of polymers revealed by DOSY NMR

被引：92

作者：

Vieville, Justine ^{[1
,2
]}

Tanty, Matthieu ^{[1
,2
]}

Delsuc, Marc-Andre ^{[1
,2
]}

机构：

[1] IGBMC, UMR 7104, F-67404 Illkirch Graffenstaden, France

[2] NMRTEC, F-67400 Illkirch Graffenstaden, France

来源：

JOURNAL OF MAGNETIC RESONANCE | 2011年 / 212卷 / 01期

关键词：

Polymer; Polydispersity; DOSY; Fractal dimension; Inverse Laplace transform; SELF-DIFFUSION;

D O I：

10.1016/j.jmr.2011.06.020

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

The polydispersity of a polymer chain is usually measured by its polydispersity index (PDI). In this study we present a method which allows to estimate the PDI of linear polymers from a simple diffusion experiment. The approach is based on the differential diffusion profile observed for the main polymer chain signal versus the extremity signal. From this difference, a statistical analysis of the DOSY spectrum allows the PDI to be estimated accurately, to the condition that the Flory coefficient of the polymer chain is known. Alternatively, the mass average molar mass M-w and the number average molar mass M-n can be extracted separately from the same spectrum. Results on PEO mixes reveal that, using this new method, PDI can be estimated with a very good accuracy. This method can easily be applied to almost any kind of linear polymers. (C) 2011 Elsevier Inc. All rights reserved.

引用

页码：169 / 173

页数：5

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