STUDIES OF POLYMER SOLVATION BY DIELECTRIC-RELAXATION SPECTROSCOPY .1. POLYVINYL PYRROLIDONE IN PROPYLENE CARBONATE, DIMETHYL-SULFOXIDE AND TETRAMETHYL UREA

被引：10
|
作者：
ROHMANN, M [1 ]
DACHWITZ, E [1 ]
STOCKHAUSEN, M [1 ]
机构：
[1] UNIV MUNSTER,INST PHYS CHEM,SCHLOSSPL 4-7,W-4400 MUNSTER,GERMANY
来源：
COLLOID AND POLYMER SCIENCE | 1990年 / 268卷 / 04期
关键词：
Dielectric relaxation; polyvinyl pyrrolidone; solution; solvation;
D O I：
10.1007/BF01411675
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 dielectric relaxation behavior of the title solutions of PVP 40000 is measured in the frequency domain (50 MHz to 36 GHz) at 20 °C. The polymer content of the solutions (up to 0.25 mole fraction of monomer units) is such that it does not yet contribute significantly to dielectric loss. The solvent relaxation shows in all cases a bulk and a slowed down contribution, both characterized by concentration-independent relaxation times. The slow contribution is ascribed to the solvate. Solvation numbers for dilute solutions roughly range between 2 and 4 per PVP repeat unit. © 1990 Steinkopff.
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页码：326 / 329
页数：4
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