For 4-cyano-3-fluorophenyl 4-butylbenzoate (4CFPB), the process of the crystallization of the CrII phase was studied in microscopic (POM), calorimetric (DSC), and dielectric (BDS) nonisothermal experiments with various (0.5–50 K/min) heating of the metastable nematic phase obtained from its glass. Growth of areas of crystal CrII in the microscopic texture of nematic phase during heating allows estimation of degree of crystallinity D(T) vs temperature curves similar to these obtained basing on DSC heat flow curves and for slow heating with help of dielectric relaxation (BDS) method. Two types of CrII crystallization mechanisms seem to be identified: (1) strong ϕ dependence on temperature of full crystallization T_c(ϕ) and half time of crystallization t_1/2(ϕ) on slow heating up to 5 K/min points to diffusion-controlled mechanism with the energy barrier 57 kJ/mol, and (2) small effect of faster heating on T_c(ϕ) and t_1/2(ϕ) seems to illustrate thermodynamic mechanism with energy barrier 180 kJ/mol. The scenario of two mechanisms of CrII crystallization is in agreement with the results of new method proposed by Mo et al., using combination of Avrami and Ozawa equations for description of nonisothermal crystallization. In addition to crystallization of CrII of 4CFPB, at higher temperature range CrII–CrI transformation to a stable CrI crystal was digitalized based on microscopic and DCS results for heating at 1 K/min.

中文翻译：

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4-氰基-3-氟苯基4-丁苯甲酸酯（4CFPB）玻璃形成液晶的冷结晶动力学。I.非等温过程，通过微观，量热和介电方法研究

对于4-氰基-3-氟苯基4-丁基苯甲酸酯（4CFPB），CrII相的结晶过程在微观（POM），量热（DSC）和电介质（BDS）非等温实验中进行了研究，并进行了各种（0.5-50 K / min）加热从其玻璃中获得的亚稳态向列相。加热过程中，向列相微观结构中CrII晶体面积的增长允许估算结晶度D（T）与温度的曲线，类似于基于DSC热流曲线获得的曲线，并借助介电弛豫（BDS）缓慢加热方法。似乎可以确定两种类型的CrII结晶机理：（1）ϕ对完全结晶温度T _c的强依赖性（ϕ）和半结晶时间t _1/2（ϕ）在缓慢加热至5 K / min时指向具有能量屏障57 kJ / mol的扩散控制机制，以及（2）快速加热对T的影响小_c（ϕ）和t _1/2（ϕ）似乎说明了能垒为180 kJ / mol的热力学机理。CrII结晶的两种机理的情景与Mo等人提出的使用Avrami和Ozawa方程的组合描述非等温结晶的新方法的结果一致。除了4CFPB的CrII结晶外，在更高的温度范围内，基于微观和DCS结果以1 K / min的加热速率，将CrII–CrI转变为稳定的CrI晶体的过程也进行了数字化。