Isoconversional Kinetics of Nonisothermal Crystallization of Salts from Solutions

Stanford, Victoria L.; McCulley, Calla M.; Vyazovkin, Sergey

doi:10.1021/acs.jpcb.6b03860

Cited by 26 publications

(8 citation statements)

References 33 publications

(52 reference statements)

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“…These are the methods that utilize integration over small segments of α [77,79,80,81,82,83,84,85,86,87,88,89]. The flexible methods can be applied to the processes that occur on cooling such as crystallization of a polymer melt [26], gelation of a polymer solution [90], morphological solid-solid transition [91], crystallization of a salt from a solution [92], as well as thermal decomposition [93] and crosslinking polymerization [94] taking place during continuous cooling. Equally, one can eliminate the systematic error in Eα and treat processes occurring on cooling by employing the differential method of Friedman [95] or similar techniques [96].…”

Section: Basicsmentioning

confidence: 99%

ICTAC Kinetics Committee recommendations for analysis of multi-step kinetics

et al. 2020

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Section: Basicsmentioning

confidence: 99%

ICTAC Kinetics Committee recommendations for analysis of multi-step kinetics

et al. 2020

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“…The product of these terms gives rise to the temperature dependence of the rate that passes through a maximum (curve 3 in Figure 1) [33]. This explains the bell-shaped temperature dependence of the crystallization rate in polymers as well as in a wide variety of other compounds, including solutions [44,45].…”

Section: Theoretical Considerationsmentioning

confidence: 99%

Activation Energies and Temperature Dependencies of the Rates of Crystallization and Melting of Polymers

Vyazovkin

2020

Polymers

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The objective of this review paper is to survey the phase transition kinetics with a focus on the temperature dependence of the rates of crystallization and melting, as well as on the activation energies of these processes obtained via the Arrhenius kinetic treatment, including the treatment by isoconversional methods. The literature is analyzed to track the development of the basic models and their underlying concepts. The review presents both theoretical and practical considerations regarding the kinetic analysis of crystallization and melting. Both processes are demonstrated to be kinetically complex, and this is revealed in the form of nonlinear Arrhenius plots and/or the variation of the activation energy with temperature. Principles which aid one to understand and interpret such results are discussed. An emphasis is also put on identifying proper computational methods and experimental data that can lead to meaningful kinetic interpretation.

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“…Thus, when crystallization demonstrates a larger negative value of E α , it may simply mean that the process starts at smaller supercooling. An example would be acceleration due to a change in the crystallization mechanism from homogenous to heterogeneous nucleation . At any rate, the most complete and efficient way of interpreting the isoconversional activation energies is by linking them to the values of K g and U* .…”

Section: Crystallization and Melting Of Polymersmentioning

confidence: 99%

Isoconversional Kinetics of Polymers: The Decade Past

Vyazovkin

2016

Macromol. Rapid Commun.

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This article surveys the decade of progress accomplished in the application of isoconversional methods to thermally stimulated processes in polymers. The processes of interest include: crystallization and melting of polymers, gelation of polymer solutions and gel melting, denaturation (unfolding) of proteins, glass transition, polymerization and crosslinking (curing), and thermal and thermo-oxidative degradation. Special attention is paid to the kinetics of polymeric nanomaterials. The article discusses basic principles for understanding the variations in the activation energy and emphasizes the possibility of using models for linking such variations to the parameters of individual kinetic steps. It is stressed that many kinetic effects are not linked to a change in the activation energy alone and may arise from changes in the preexponential factor and reaction model. Also noted is that some isoconversional methods are inapplicable to processes taking place on cooling and cannot be used to study such processes as the melt crystallization.

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Isoconversional Kinetics of Nonisothermal Crystallization of Salts from Solutions

Cited by 26 publications

References 33 publications

ICTAC Kinetics Committee recommendations for analysis of multi-step kinetics

ICTAC Kinetics Committee recommendations for analysis of multi-step kinetics

Activation Energies and Temperature Dependencies of the Rates of Crystallization and Melting of Polymers

Isoconversional Kinetics of Polymers: The Decade Past

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