Glass working point

For most thermodynamic studies data must be obtained over a wide range of temperature. This requires that the solvent have a broad liquid range. Some recent work also has pointed out the advantages of operating at low temperature.7 Hence solvents with a low melting point or glass-transition point are desirable butyronitrile has been shown to be useful down to — 130°C. 

Working Point (=104 poises) Glass is a very thick liquid at this point... 

Glass Type Thermal Coefficient of Expansion (0-300°C) xlO"7 Acm/cm/°C Strain Pont (=°C) Annealing Point (-°C) Softening Point ( °C) Working Point ( °C) Density (g/cm2) Refractive Index... 

Their work points out that the change in glass transition of a cross-linked polymer is due to the combined eflFects of cross linking (AT )p and the structure of the cross-linking molecules (aT ). ... 

It is the frequency effect of viscoelastic material that makes the static measurement of polymer properties less valuable than normally perceived. More work needs to be done in characterizing the typical polymers used in CMP for their frequency responses, which will allow a more accurate positioning of their behavior. Although the glass transition point is often used as a characteristic metric for these polymers, perhaps the shoulder of the curve (marking the actual transition from the viscoelastic to the glassy solid region) would be more useful. 

Working point 10 homogeneous melt is achievable Glass is easily deformed but 1000... 

However, certain polymers with very low glass transition temperatures (polyurethanes) or glass transition points at both high and low temperature (polybenzimidazole, epoxy-nylon, epoxy-amide) have good retention of both tensile strength and elongation at cryogenic temperatures and are usually the only materials that will work well at these temperatures. 

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