Dilatometric fragility and prediction of the viscosity curve of glass‐forming liquids

Ding, Linfeng; Qu, Conghang; Yang, Yongjian; Wilkinson, Collin J.; Lee, Kuo Hao; DeCeanne, Anthony V.; Doss, Karan; Mauro, John C.

doi:10.1111/jace.17125

Cited by 8 publications

(6 citation statements)

References 23 publications

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“…The temperature of the glass transition can be determined using different methods, e.g., thermomechanical analysis, 7 dynamic mechanical analysis, 8 differential scanning calorimetry, 9 broadband dielectric spectroscopy, 10 thermo-optical analysis, 11 and Raman spectroscopy. 12 Among those, differential scanning calorimetry (DSC) is one of the most commonly used methods.…”

Section: ■ Introductionmentioning

confidence: 99%

Glass Transition Kinetics and Physical Aging of Polyvinylpyrrolidones with Different Molecular Masses

et al. 2022

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The stability of glassy materials, including polymer-based ones, is one of the important subjects of material science and technology. This interest is due to the dependence of the properties of the end products, based on glassy materials, on the processing and storage conditions. In particular, the application of amorphous solid dispersions based on polymer excipients requires an understanding of the kinetics of the formation and the physical aging of the glassy state. The kinetic parameters of the glass transition of polyvinylpyrrolidone, a widely used polymer in the pharmaceutical industry, were determined in the present work using fast scanning calorimetry. The dependencies of the Vogel temperature and the kinetic fragility on the molecular mass of the polymer were determined, as well as the apparent activation energy of the physical aging process, which changes from 256 kJ·mol–1 in the case of polyvinylpyrrolidone with a molecular mass of 3500 g·mol–1 to 565 kJ·mol–1 in the case of polyvinylpyrrolidone with a molecular mass of 1,300,000 g·mol–1. The results of the current work can be used to optimize the processing of polymer-based glassy materials to obtain the desired properties for application in different fields of technology, including pharmaceuticals.

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Section: ■ Introductionmentioning

confidence: 99%

Glass Transition Kinetics and Physical Aging of Polyvinylpyrrolidones with Different Molecular Masses

et al. 2022

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“…The same correction also applies to dilatometry-derived fragility values. 16 Using the calculated kinetic fragility and T g,DSC , together with η ∞ (x)=10 −2.93 Pa•s, the viscosity value at any temperature can be calculated using the MYEGA equation 6 We have determined T L values for the seven glass-forming liquids using DSC as mentioned above. By combining the two methods, we calculate η L solely using DSC, which can be termed the DSC η L .…”

Section: Resultsmentioning

confidence: 99%

Determining the liquidus viscosity of glass‐forming liquids through differential scanning calorimetry

Zheng

Solvang

et al. 2020

J Am Ceram Soc

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Viscosity at the liquidus temperature (TL), ηL, is a critical parameter for the design of new glasses, particularly for industrial glass production where crystallization must be suppressed. However, a direct viscometric determination of ηL for a glass‐forming system is difficult due to crystallization. Here we propose an alternative approach for determining ηL through differential scanning calorimetry (DSC). Specifically, DSC is used to measure both the viscosity curve and liquidus temperature of a glass‐forming system and then derive its ηL value. The ηL values determined using DSC are found to be in excellent agreement with those measured through viscometry. The DSC approach is applicable to various glass‐forming systems covering a wide range of fragilities and ηL values spanning over five orders of magnitude. Other advantages of this approach are its accuracy and small sample requirements.

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“…The T th value is defined as the intersection point of the tangents before and after the transition, as illustrated by the red solid lines in Figure 2A. Note that, we adopted the conventional definition of the fictive temperature in the V ‐ T diagram 1,22 but here T th has a different meaning because the quench pressure is being released. The dependence of T th on the quench pressure is shown in Figure 2B.…”

Section: Resultsmentioning

confidence: 99%

Understanding thermal expansion of pressurized silica glass using topological pruning of ring structures

Yang

Tokunaga²,

Hayashi³

et al. 2020

J. Am. Ceram. Soc.

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We investigate the structural origin of the large thermal expansion coefficient of hotcompressed silica glass upon heating to a threshold temperature using molecular dynamics (MD) simulations. While the simulated thermal expansion at low temperature correlates well with the elongation of the average interatomic separation distance of the Si-O or Si-Si pair, the excess thermal expansion due to hot compression mainly results from change in medium range order, including a decrease in the population of large rings upon heating, without significant modification of the small ring population and without changing the short range ordering, such as the Si-O coordination number. The reduction in the characteristic ring size can be connected to the high thermal expansion through the topological pruning mechanism. Such large thermal expansion is suppressed when the silica glasses are held at their respective quench pressures. The suppression of this excess thermal expansion is consistent with the pressure stabilization of the large ring structures.

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Dilatometric fragility and prediction of the viscosity curve of glass‐forming liquids

Cited by 8 publications

References 23 publications

Glass Transition Kinetics and Physical Aging of Polyvinylpyrrolidones with Different Molecular Masses

Glass Transition Kinetics and Physical Aging of Polyvinylpyrrolidones with Different Molecular Masses

Determining the liquidus viscosity of glass‐forming liquids through differential scanning calorimetry

Understanding thermal expansion of pressurized silica glass using topological pruning of ring structures

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