Kinetics of non-isothermal cold-crystallization of carbamazepine in the glassy state studied by DSC

2022 ◽  
Vol 575 ◽  
pp. 121198
Author(s):  
Agnieszka Dołęga ◽  
Piotr M. Zieliński
Keyword(s):  
Glassy State ◽  
Cold Crystallization ◽  
Kinetics Of

Molecular Dynamics and Kinetics of Isothermal Cold Crystallization in the Chiral Smectogenic 3F7HPhH6 Glassformer

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1487
Author(s):  
Aleksandra Deptuch ◽  
Małgorzata Jasiurkowska-Delaporte ◽  
Ewa Juszyńska-Gałązka ◽  
Anna Drzewicz ◽  
Wojciech Zając ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Optical Microscopy ◽  
Dielectric Spectroscopy ◽  
Cold Crystallization ◽  
Scanning Calorimetry ◽  
Broadband Dielectric Spectroscopy ◽  
Smectic C ◽  
Dimension Analysis ◽  
Fractal Dimension Analysis ◽  
Kinetics Of

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.

Crystallization kinetics of oriented poly (ethylene terephthalate) from the glassy state

Polymer ◽  
1978 ◽  
Vol 19 (6) ◽  
pp. 711-716 ◽  
Author(s):  
Giovanni Carlo Alfonso ◽  
Maria Pia Verdona ◽  
Andrzej Wasiak
Keyword(s):  
Crystallization Kinetics ◽  
Ethylene Terephthalate ◽  
Glassy State ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Kinetics Of

scholarly journals Nonisothermal Cold Crystallization Kinetics of Poly(aryl ether diphenyl ether ketone)

2000 ◽  
Vol 32 (3) ◽  
pp. 287-290 ◽  
Author(s):  
Zhao Bin Qiu ◽  
Hong Wei Zhou ◽  
Zhi Shen Mo ◽  
Hong Fang Zhang ◽  
Zhong Wen Wu
Keyword(s):  
Crystallization Kinetics ◽  
Diphenyl Ether ◽  
Cold Crystallization ◽  
Aryl Ether ◽  
Ether Ketone ◽  
Kinetics Of

Glass Formation During Room Temperature, Isothermal Drying

2003 ◽  
Author(s):  
Alptekin Aksan ◽  
Mehmet Toner
Keyword(s):  
Glass Transition ◽  
Glassy State ◽  
Glass Transitions ◽  
Scanning Calorimetry ◽  
Modulated Differential Scanning Calorimetry ◽  
Glass Transition Kinetics ◽  
The Stability ◽  
Isothermal Drying ◽  
Kinetics Of

Isothermal drying and glass transition of solutions and films have drawn considerable attention from many industries. We here explore the feasibility of modifying the isothermal drying and vitrification kinetics of carbohydrate solutions in order to ensure the stability and quality of their ingredients. Modulated Differential Scanning Calorimetry experiments with isothermally dried trehalose and trehalose/dextran solutions were performed and the glass transition kinetics have been determined. Three distinct drying regimes were observed. With isothermal, isobaric drying at 0%RH, it was indeed possible to reach the glassy state for a trehalose and a trehalosedextran system. With the addition of high molecular weight sugars, the glass transitions of isothermally dried carbohydrate solutions can be accelerated as a function of dextran mass ratio in the sample.

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