Scaling for Sedimentation and Diffusion of Poly(ethylene glycol) in Water

被引：19

作者：

Luo, Zhenli ^{[1
]}

Zhang, Guangzhao ^{[1
]}

机构：

[1] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Dept Chem Phys, Hefei 230026, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2009年 / 113卷 / 37期

关键词：

ANALYTICAL ULTRACENTRIFUGATION; POLYETHYLENE OXIDE; AQUEOUS-SOLUTIONS; SOLUTION CONFORMATION; LIGHT-SCATTERING; DILUTE-SOLUTIONS; LAMM EQUATION; VELOCITY; PEGYLATION; POLYMERS;

D O I：

10.1021/jp906468n

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The sedimentation and diffusion of poly(ethylene glycol) (PEG) with weight average molecular weight (M-w) from 5 x 10(2) to 2 x 10(5) g/mol have been investigated by use of an analytical ultracentrifuge (AUC). The sedimentation velocity analysis based on the Lamm equation gives the sedimentation coefficient (s) and diffusion coefficient (D). Our study reveals that the sedimentation coefficient (s(0)) and diffusion coefficient (D-0) at infinite dilution scale to molecular weight (M-w), namely, s(0) = KsMw alpha, with K-s = 6.14 x 10(-3) and alpha = 0.469 +/- 0.008, and D-0 = KDMw-beta, with K-D = 1.43 x 10(-8) and beta = 0.576 +/- 0.007.

引用

页码：12462 / 12465

页数：4

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