Analysis of ultracentrifugation interference patterns with image digitizer: Application to molecular weight determination of SRM 1478 polystyrene期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Analysis of ultracentrifugation interference patterns with image digitizer: Application to molecular weight determination of SRM 1478 polystyrene

Authors:	Francis W. Wang Frank L. McCrackin

Affiliation:	Polymer Science and Standards Division, National Bureau of Standards, Washington, DC 20234, USA

Abstract:	A new method for the analysis of ultracentrifugation interference patterns with the use of a commercial image digitizer is given. The application of the method to the sedimentation equilibrium data for SRM 1478 polystyrene leads to a weight-average molecular weight of 37 400 g mol⁻¹ having a sample standard deviation of 0.7% and an expected systematic error limit of 2%.

Keywords:	Image digitization Rayleigh interference pattern sedimentation equilibrium SRM 1478 polystyrene ultracentrifugation weight-average molecular weight
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