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Thermodynamic parameters of poly(ethylene glycol) from dielectric relaxation studies

机译:介电弛豫研究的聚乙二醇热力学参数

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摘要

Thermodynamic parameters, like change in free energy of activation (ΔG _τ *), enthalpy of activation (ΔH _τ *), and entropy of activation (ΔS _τ *) of poly(ethylene glycol) with average molecular mass 400 Delton (PEG 400) in dilute solution of benzene were computed on the basis of theory of Eyring rate process. To estimate these, the dielectric relaxation time (τ), determined at various temperatures adopting Whiffen and Thompson model have been used. X-band microwave bench working at 9.59 GHz was employed to find temperature dependent real part ε of the complex dielectric permittivity ε* and dielectric loss ε″. The values of these ε and ε″ are used to find τ values. Based on the results reported, the relaxation behavior of the stated polymer in nonpolar solvent is discussed.
机译:热力学参数,例如平均分子量为400 Delton(PEG 400)的聚乙二醇的活化自由能(ΔG_τ*),活化焓(ΔH_τ*)和活化熵(ΔS_τ*)的变化根据Eyring速率过程理论计算了苯的稀溶液中的苯酚。为了估计这些,已使用在不同温度下采用Whiffen和Thompson模型确定的介电弛豫时间(τ)。使用工作在9.59 GHz的X波段微波工作台来找到复介电常数ε*和介电损耗ε''的温度相关实部ε。这些ε和ε''的值用于找到τ值。基于报告的结果,讨论了所述聚合物在非极性溶剂中的松弛行为。

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