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首页> 外文期刊>Crystal growth & design >Kinetics of Polymorphic Transitions of Cyclohexanol Investigated by Terahertz Absorption Spectroscopy
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Kinetics of Polymorphic Transitions of Cyclohexanol Investigated by Terahertz Absorption Spectroscopy

机译：太赫兹吸收光谱法研究环己醇多态转变的动力学

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摘要

The phase behaviors and kinetics of the polymorphic transitions of cyclohexanol, C_6H_(11)OH, were investigated by terahertz absorption spectroscopy over the temperature range of 150?330 K. A new phase was found, labeled phase I′, which is more stable than the previously observed phase I but less stable than phase III′. The kinetics of the irreversible transitions from phase I to I′, phase I to III′, and phase III′ to III were analyzed using Avrami’s theory. The transition geometries of the first two transitions were found to be one-dimensional, while the latter was two-dimensional. The transitions from phase I to III and phase III to II were revealed to occur through two-step processes. The mechanism of these irreversible transitions is discussed in relation to the formation and dissociation of hydrogen bonds between the hydroxyl groups as well as the steric restriction effects of the cyclohexyl ring.
机译：通过太赫兹吸收光谱研究了在150？330 K温度范围内环己醇C_6H_（11）OH的多晶型转变的相行为和动力学。发现了一个新的相，标记为I'，比I'稳定。先前观察到的阶段I，但不如阶段III'稳定。使用Avrami的理论分析了从I相到I'相，I相到III'相和III'相到III相不可逆转变的动力学。发现前两个过渡的过渡几何形状是一维的，而后一个过渡是二维的。从第一阶段到第三阶段以及从第三阶段到第二阶段的过渡过程显示为通过两步过程进行的。这些不可逆转变的机理与羟基之间氢键的形成和解离以及环己基环的空间限制作用有关。

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