CAJ | 학술논문

针对由刚性极性分子为溶质和弱极性分子为溶剂构成的二元混合物，通过介电损耗实验，探究不同摩尔比例下α和βJG弛豫在强度和时间上的定量关系。发现α和βJG弛豫强度比值Δεα／Δεβ和弛豫时间对数比logτα／logτβ随温度均表现为线性关系，但是前者斜率随组分改变明显，相比之下后者斜率近似相等。也发现具有正混合热的二元混合体系中βJG弛豫时间越长，弛豫强度越高，这不同于纯物质中的行为，从极性分子所占自由体积与极性分子的数目两个方面进行了分析。本研究加深了对βJG弛豫物理本质的进一步认识和理解，同时为有效预测βJG弛豫的弛豫时间提供了工具。
침대유강성겁성분자위용질화약겁성분자위용제구성적이원혼합물，통과개전손모실험，탐구불동마이비례하α화βJG이예재강도화시간상적정량관계。발현α화βJG이예강도비치Δεα／Δεβ화이예시간대수비logτα／logτβ수온도균표현위선성관계，단시전자사솔수조분개변명현，상비지하후자사솔근사상등。야발현구유정혼합열적이원혼합체계중βJG이예시간월장，이예강도월고，저불동우순물질중적행위，종겁성분자소점자유체적여겁성분자적수목량개방면진행료분석。본연구가심료대βJG이예물리본질적진일보인식화리해，동시위유효예측βJG이예적이예시간제공료공구。
Dielectric measurements of the binary molecular mixtures composed of a rigid and polar liquid as solute and a non?polar liquid as solvent are performed to explore the correlation of the relaxation time and the relaxation strength of theαandβJG relaxa?tions in different compositions.The ratio of the relaxation strength for theαandβJG relaxations Δεα/Δεβ is found to increase lin?early with temperature but the slopes differ notably among the mixtures. In contrast where as the ratio of the logarithmic relaxation time for the two relaxations logτα/logτβ also shows a linear relation to temperature the slopes basically keep constant enabling the effective prediction of theβJG relaxation time.Meanwhile quite different behaviors are found for the relaxation strength and relax?ation time in binary glass forming mixtures when compared with the pure glass formers and the contributions from the free volume and the number of polar molecules in mixtures are discussed.The results would help the further understanding of the physics of theβJG relaxation.