Dielectric relaxation strength and magnitude of dipole moment of poly(vinyl pyrrolidone) in polar solutions
Dielectric relaxation strength and magnitude of dipole moment of poly(vinyl pyrrolidone) in polar solutions
复制标题
极性溶液中聚乙烯基吡咯烷酮的介电弛豫强度和偶极矩大小
DOI：
10.1016/j.molliq.2013.02.020
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
et al.
中科院分区：
文献类型：
--
作者：
N. Shinyashiki;et al.
研究了聚乙烯吡咯烷酮(PVP)在25℃不同溶剂(氯仿、水、单羟基醇和双羟基醇)溶液中的链段运动引起的介电松弛。PVP链段运动的松弛强度随溶剂的不同而不同。用Onsager方程计算了PVP在不同溶剂溶液中重复单元的有效偶极矩的大小简单地取决于溶剂在较高频率下的介电常数。
Dielectric relaxation caused by the segmental motion of poly(vinyl pyrrolidone) (PVP) was observed in solutions at 25°C with various solvents, that is, chloroform, water, and mono- and dihydroxyl alcohols with dielectric constants ranging between 5 and 78. The relaxation strength of the segmental motion of PVP varies with the solvent. The magnitudes of the effective dipole moment of the repeat unit of PVP in solutions with various solvents calculated using the Onsager equation depends simply on the dielectric constant of the solvent at higher frequency.