小分子玻璃體系結構弛豫非線性特征的焓弛豫研究
[Abstract]:In order to understand the variation of nonlinear characteristic parameters and their correlation with other characteristic parameters during glass transition, the relationship between nonlinear parameters and thermal stability of glass state materials is discussed. In this paper, differential scanning calorimeter (DSC) was used to treat three binary mixed solutions (methyl m-methylbenzoate and methyl o-methylbenzoate) with glass-forming ability and different mixing modes. The isothermal structural relaxation of methyl m-methylbenzoate, dibutyl phthalate, dibutylene phthalate and 2-ethylhexylamine), triacetylglycerol and glycerol in glass state was measured by calorimetry. The experimental results are fitted with Tool-Narayanaswamy-Moynihan-Hodge (TNMH) equation Kohlrausch-Williams-Watts (KWW) equation and Richert equation. The enthalpy relaxation of simple liquids with different liquid strength parameters, isomer molecules, and different functional groups is studied. It is found that in the same materials, when the liquid strength and weakness parameters change greatly, The nonlinear parameters decrease with the increase of liquid strength. The results in any kind of glass systems such as polymers, inorganic substances, ionic liquids and metallic glasses also accord with this rule. It is also found that, in general, the nonlinear parameter of the material is smaller than that of the non-exponential parameter. The variation of kinetic parameters with components in ideal mixed solution, approximate ideal mixed solution and non ideal mixed solution was analyzed by enthalpy relaxation. The deviation direction of nonlinear parameters with components is the same as that of non-exponential parameters, and the degree of deviation is affected by mixed heat. The isothermal structure relaxation of triacetylglycerol and glycerol in glass state was studied by enthalpy relaxation. The results of fitting by TNMH equation show that the nonlinear parameter value is a temperature time function and increases with the increase of isothermal time. The results of free fitting and fixed fitting with KWW equation and Richert equation show that it is more reasonable to use Richert equation for fixed fitting, and the nonlinear parameters vary with the decrease of annealing temperature. It is also found that the nonexponential parameter values in glass state are not equal to the values at the glass transition temperature. The results are helpful to estimate the nonlinear characteristic parameters of the unknown glass-forming materials, to evaluate the accuracy of the calculation of the characteristic parameters in the glass-forming materials, and to make use of the variation law of the parameters in binary mixed solution. It can extrapolate the kinetic characteristic parameters of some materials with low glass-forming ability, deepen the understanding of the glass-forming materials which are not easy to be studied separately, and guide the construction of structural materials with special dynamic characteristic parameters. The study of isothermal structure relaxation in glass state is beneficial to the understanding of the variation of nonlinear and nonexponential parameters with time and temperature in the whole glass transition temperature range. It is helpful to understand the change of properties of glass state materials in the process of application and to guide the construction of the correlation between nonlinear characteristic parameters and thermal stability of glass state materials.
【學位授予單位】:燕山大學
【學位級別】:博士
【學位授予年份】:2015
【分類號】:TB30
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