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

作者：Gong, Xiaoliang; Hansen, Eddy W^*; Chen, Qun

来源：Macromolecular Chemistry and Physics, 2012, 213(3): 278-284.

DOI：10.1002/macp.201100528

• diffusion
• molecular weight distribution
• PFGNMR
• stretched-exponential function
• simulations

Assuming the signal response in a pulsed gradient stimulated echo (PGSTE) experiment (on a polymer) to be described by a simple stretched-exponential 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.

• 出版日期2012-2-13
• 单位华东师范大学