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Broadband dielectric study of dynamics of poly(vinyl pyrrolidone)-ethylene glycol oligomer blends

机译:聚乙烯吡咯烷酮-乙二醇低聚物共混物动力学的宽带介电研究

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Broadband dielectric measurements for blends of poly(vinyl pyrrolidone) (PVP) and ethylene glycol oligomer (EGO) from 0 to 40 wt % PVP were carried out at 25 degrees C in the frequency range from 20 Hz to 20 GHz. The EGOs used in this study were ethylene glycol (EG), diethylene glycol (2EG), and PEG400 (MW = 400). For the PVP-EG, -2EG, and -PEG400 blends, relaxation processes caused by the motion of EGO in the GHz range and the micro-Brownian motion of the PVP chain at 10 kHz-1 MHz were observed. Although the PVP-EGO blend is miscible, relaxation processes caused by the molecular motion of EGO and the local chain motion of PVP were observed individually. The relaxation time of the local chain motion of PVP showed a strong PVP concentration dependence and a solvent viscosity dependence, which are similar to those reported so far for the solutions in nonpolar solvents.
机译:聚乙烯吡咯烷酮(PVP)和乙二醇低聚物(EGO)的PVP含量为0至40 wt%的混合物的宽带介电测量是在25摄氏度,频率为20 Hz至20 GHz的条件下进行的。在这项研究中使用的EGO是乙二醇(EG),二甘醇(2EG)和PEG400(MW = 400)。对于PVP-EG,-2EG和-PEG400共混物,观察到由EGO在GHz范围内的运动和PVP链在10 kHz-1 MHz的微布朗运动引起的弛豫过程。虽然PVP-EGO混合物是可混溶的,但分别观察到由EGO的分子运动和PVP的局部链运动引起的弛豫过程。 PVP的局部链运动的弛豫时间显示出强烈的PVP浓度依赖性和溶剂粘度依赖性,这与迄今为止在非极性溶剂中的溶液报道的相似。

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