cold crystallization
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Polymer ◽  
2022 ◽  
pp. 124515
Author(s):  
Tamara M. Díez-Rodríguez ◽  
Enrique Blázquez-Blázquez ◽  
Juan C. Martínez ◽  
Ernesto Pérez ◽  
María L. Cerrada

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1487
Author(s):  
Aleksandra Deptuch ◽  
Małgorzata Jasiurkowska-Delaporte ◽  
Ewa Juszyńska-Gałązka ◽  
Anna Drzewicz ◽  
Wojciech Zając ◽  
...  

An investigation of the glass transition of the antiferroelectric smectic C*A phase and cold crystallization of (S)-4’-(1-methylheptylcarbonyl)biphenyl-4-yl 4-[7-(2,2,3,3,4,4,4-heptafluoro- butoxy)heptyl-1-oxy]benzoate (denoted as 3F7HPhH6) by differential scanning calorimetry, polarizing optical microscopy and broadband dielectric spectroscopy is presented. The fragility index mf = 72, classifying 3F7HPhH6 as a glassformer with intermediate fragility, was obtained from the temperature dependence of the α-process relaxation time, measured upon cooling. Duplication of the α-process was observed exclusively upon heating, before the onset of cold crystallization, and is connected with the pre-transitional effect. The presence of two crystal phases likely influences the kinetics of cold crystallization; the idea stems from a comparison with previous results for the 3F7HPhF6 and 3F7HPhH7 compounds. Additionally, the presence of the smectic C*α; sub-phase in a narrow temperature range was proved based on the differential scanning calorimetry and broadband dielectric spectroscopy results, as well as the fractal dimension analysis of the textures obtained by polarizing optical microscopy.


ACS Omega ◽  
2021 ◽  
Author(s):  
Katsuma Ishino ◽  
Hajime Shingai ◽  
Yasuyuki Hikita ◽  
Isao Yoshikawa ◽  
Hirohiko Houjou ◽  
...  

2021 ◽  
pp. 179100
Author(s):  
Agnieszka Dołęga ◽  
Ewa Juszyńska-Gałązka ◽  
Aleksandra Deptuch ◽  
Stanisław Baran ◽  
Piotr M. Zieliński

Author(s):  
Akinori Honda ◽  
Shunta Kakihara ◽  
Masato Kawai ◽  
Tomomi Takahashi ◽  
Kazuo Miyamura

2021 ◽  
Vol 10 (2) ◽  
pp. 10-15
Author(s):  
Dien Luong Xuan

Molecules exhibiting cold crystallization, an exothermic phenomenon in heating following supercooling, can be used as a heat-storing material. On the other hand, examples in non-polymers are still few. To test metal complexes as potential compounds for heat-storage materials, a salicylaldiminato-typed copper(II) complex, bis[2-[(octylimino)methyl]-1-pyrenolato-N,O] copper(II) 1(Cu), which had two different coloured forms and a characteristic long alkyl chain, exhibited complicated thermal behaviour including cold crystallization. The long alkyl chain was a steric barrier to molecular stacking, leading to the supercooled state. Besides, the two polymorphs were characterized by IR spectra studies and magnetic susceptibility.


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