Studies Of Secondary Relaxation Dynamic In Mixtures Of Rigid Molecule Glass Forming Liquids

Glass transition include various types of relaxations such as debye relaxation,structure(α-)relaxation,βJG relaxation and gama relaxation.βJG relaxation has a close relationship to a relaxation in glass-forming substance with past research.In this paper,binary and ternary mixtures of polar and apolar molecules are studied.The results will benefit the further understanding of the physics process of glass state.The binary mixtures of rigid molecules 6-Fluoro-2-methylquinoline(6F2M)and Triphenylethylene(TPE)are studied by dielectric techniques to explore the correlation of the relaxation time and relaxation strength in a relaxation and βJG relaxation in different compositions.The complex dynamic processes are shown in binary mixtures and the free volume is discussed in mixtures.Obvious βJG relaxation is needed in substance,so the rigid molecules 3-Methylquinoline(3MLQ)and O-Terphenyl(OTP)are chosen to be sample because pure glass former has lower glass forming ability generally.Dielectric and enthalpy measurements are performed in ternary mixtures of sample with two aromatics of two weak polarity molecules Ethylbenzene(EB)and 9,10-Diphenylanthracene(DPL)which have smaller and larger molecular sizes than 3MLQ,respectively.Two experimental measurements and data analysis are outlined in details.On the one hand,βJG relaxation is obvious separating from a relaxation.On the other hand,the abnormal strength of a relaxation increases with increasing temperature when DPL added.The results indicate that the larger effect on dielectric strength,relaxation time of βJG relaxation when DPL added in ternary mixtures.