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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Influence of the Internal Structure and Intermolecular Interactions on the Correlation between Structural (alpha) and Secondary (beta-JG) Relaxation below the Glass Transition Temperature in Neat Probucol and Its Binary Mixtures with Modified Saccharides
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Influence of the Internal Structure and Intermolecular Interactions on the Correlation between Structural (alpha) and Secondary (beta-JG) Relaxation below the Glass Transition Temperature in Neat Probucol and Its Binary Mixtures with Modified Saccharides

机译：内部结构和分子间相互作用对整个糖果玻璃化转变温度低于纯糖果的结构（α）和次生（β-JG）弛豫的相关性及其二元混合物及其改性糖类

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Broadband dielectric spectroscopy (BDS) has been used to study the molecular dynamics and aging process in neat probucol (PRO) as well as its binary mixtures with selected acetylated saccharides. In particular, we applied the Casalini and Roland approach to determine structural relaxation times in the glassy state of the examined systems (so-called isostructural times, tau(iso)). Next, using the calculated tau(iso), primitive relaxation times of the coupling model were obtained and compared to the experimental secondary beta (Johari-Goldstein (JG) type) relaxation times. Interestingly, it turned out that there is a correlation between the beta-JG and the structural (alpha)-relaxation processes below the glass transition temperature (T < T-g) in each investigated sample. This is a new observation compared to previous studies demonstrating that such a relationship exists only in the supercooled liquid state of neat PRO. Moreover, it was revealed that the stretching parameters obtained from the aging procedure are very close to the ones determined by fitting the dielectric data above the T-g with the use of the Kohlrausch-Williams-Watts function, indicating that the aging process is governed by the alpha-relaxation. Complementary Fourier transform infrared and X-ray diffraction measurements allowed us to find a possible reason for these findings. It was demonstrated that although there are very weak intermolecular interactions between PRO and modified saccharides, the intra- and intermolecular structure of PRO is practically unaffected by the presence of modified saccharides.
机译：宽带介电光谱（BDS）已用于研究整齐型丙醇（PRO）中的分子动力学和老化方法以及其具有选定的乙酰化糖苷的二元混合物。特别是，我们应用了Casalini和Roland方法来确定所检查系统的玻璃状态的结构松弛时间（所谓的IsoStrontuctucty时代，Tau（ISO））。接下来，使用计算的TAU（ISO），获得耦合模型的原始弛豫时间，并与实验二次β（Johari-Goldstein（JG）型）弛豫时间进行比较。有趣的是，它证明，β-JG和结构（α） - 在每个研究样品中玻璃化转变温度（T

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