DSC studies on organic melting point temperature standards

Charsley, Edward L.; Laye, P.G.; Palakollu, V.; Rooney, James J.; Joseph, Benn

doi:10.1016/j.tca.2006.02.035

Cited by 38 publications

(23 citation statements)

References 5 publications

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“…and . The empirical 2/3 rule has been reported in several earlier studies . The stable glass formers, which we have studied, have a T g / T L ratio of about 2/3, and are expected to exhibit a wider viscosity window of fiber spinning compared to unstable glasses.…”

Section: Fiber Spinnabilitysupporting

confidence: 65%

“…Since the thermal conductivities of both the DSC device and the sample are limited, the thermal response is detected by the DSC at a higher temperature than the actual melting temperature of crystals when increasing the DSC upscan rate. It is known that the dynamic T L value is linearly shifted to higher temperatures with heating rate …”

Section: Liquidus Temperature and Viscositymentioning

confidence: 99%

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Fiber spinnability of glass melts

Yue

Zheng

2016

Int J of Appl Glass Sci

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Fiber spinnability is the ability of a glass‐forming melt to be steadily stretched and spun into defect‐free fiber filaments. However, its quantification has not been well established owing to many controlling factors such as melt fragility, melt strength, surface tension, liquidus temperature, liquidus viscosity, and crystallization. To understand and quantify the fiber spinnability of a glass melt, we consider two key aspects: fiberizing viscosity window and melt stability. The fiberizing viscosity window is defined by the upper and lower viscosity limits. Fibers rupture above the upper viscosity limit, whereas a stable melt stream cannot form below the lower limit (ηlow). We introduce a simple parameter to quantify fiber spinnability, namely, Kfib=ηL/ηlow, where ηL is the viscosity at liquidus temperature (TL). A fiber can only form if Kfib>1. To quantify melt stability we propose the parameter of S=(TL‐TC)/(TL‐Tg), where TL and TC are the liquidus temperature, and the onset temperature of melt crystallization during cooling, respectively. Both parameters (Kfib and S) are important for a rational design of glass fiber compositions, and fiberizing process. We use two basalt melts as examples of this study to demonstrate the high sensitivity of fiber spinnability to a minor variation in chemical composition of melts.

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Section: Fiber Spinnabilitysupporting

confidence: 65%

Section: Liquidus Temperature and Viscositymentioning

confidence: 99%

Fiber spinnability of glass melts

Yue

Zheng

2016

Int J of Appl Glass Sci

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“…The onset temperature of the melting peak was measured at a series of different heating rates and the value of the melting temperature was extrapolated to zero heating rate. Charsley et al [5] provide experimental confirmation that the extrapolated onset temperature at zero heating rate corresponds to the certified thermodynamic melting temperature. The thermodynamic melting temperature of the morph I and the morph II are presented in table 1 [3].…”

Section: Application To the Etiracetam Compoundmentioning

confidence: 88%

Towards an accurate and precise determination of the solid–solid transition temperature of enantiotropic systems

Herman

Leyssens

Vermylen

et al. 2011

The Journal of Chemical Thermodynamics

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“…Metal fi bers tend to break easily even in the solid state, so it is advised to use thin metal fi lm strips instead. In addition to metal standards, distilled water ( T m = 0 ° C) and organic substances (in liquid and powder forms) with sharp melting points (e.g., toluene, T m = − 95 ° C; acetic anhydride, T m = − 73 ° C; benzophenone, T m = 48.1 ° C; phenoxybenzene, T m = 26.9 ° C, and naphthalene, T m = 80.2 ° C) can be used as temperature calibration standards (Lotti and Canevarolo 1998 ;Charsley et al 2006 ). Sigma -Aldrich ( http://www.sigmaaldrich.com ) is a source for these materials.…”

Section: Temperature Calibrationmentioning

confidence: 99%