A new approach to the determination of the statistical segment length of wormlike polymers |
| |
Authors: | A. Dondos G. Staikos |
| |
Affiliation: | (1) Department of Chemical Engineering, University of Patras, 26500 Patras, Greece |
| |
Abstract: | The Stockmayer-Fixman-Burchard (SFB) and the Dondos-Benoit (DB) equations have been applied to determine the unperturbed dimensions parameterK of wormlike polymers. An empirical relation between the Flory's constant and the Mark-Houwink-Sakurada (MHS) exponenta has been proposed. The values found by this equation are lower than the value 2.5×1023 used in the case of flexible polymers and this deviation is attributed to the influence of the draining effect. From theK value and the so calculated value of , we calculate the Kuhn statistical segment length of wormlike polymers. The obtained — for a great number of wormlike polymers — statistical segment lengths are almost the same as these calculated by the Yamakawa-Fujii and the Bohdanecky methods. The molecular mass regions in which the SFB, the DB, and the MHS equations are valid are explored. A criterion for the distinction between flexible and wormlike polymers is proposed based on the way of approach to the power law. |
| |
Keywords: | Wormlike polymers unperturbed dimensions Flory's constant /content/j132512526k62517/xxlarge934.gif" alt=" PHgr" align=" BASELINE" BORDER=" 0" > statistical segment length |
本文献已被 SpringerLink 等数据库收录! |