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Elastic sulfur is a dark yellow elastic solid. Compared with other sulfur allotropescarbon disulfideMedium solubility is smaller.Insoluble in water and slightly soluble in alcohol, it is one of many sulfur allotropes.
When the sulfur powder is heated beyond its melting point, it becomes a yellow liquid with fluidity. When it is heated above 433K, the S8 ring structure breaks into infinite chain like molecules (S ∞) that are twisted together. The color of liquid sulfur becomes darker and its viscosity increases. When it is close to 473K, its viscosity is the largest.When heating continues (above 523K), the long chain sulfur breaks into small molecules, so the viscosity decreases.At 717.6K, sulfur will become vapor, and there are S8, S6, S4, S2 and other molecules in the vapor.The density of sulfur vapor at about 1273K is equivalent to S2 molecule.
If molten sulfur is poured into cold water rapidly, long chain sulfur is fixed to become stretchable elastic sulfur, but it will become monoclinic sulfur after being placed.
Viscosity property
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Elastic sulfur
150-350 ° Viscosity Properties
The molecule of solid sulfur is generally S8, and its structure is saddle type. When the sulfur is heated, the molecular structure changes.When heated to 160 ℃, the ring of S8 begins to break into open chains, and the viscosity increases. When it reaches 190 ℃, the viscosity is the maximum.When the temperature is kept above 190 ℃, the long chain begins to break and the viscosity decreases again.At 130~160 ℃, liquid sulfur has the lowest viscosity and the best fluidity.The viscosity of sulfur at various temperatures is shown in the figure.
