Calculating Glass Transition Temperature on Polymer

The glass-to-rubber transition temperature [ Tg ], is of special interest in the development of new amorphous polymers because many properties of technological importance show a significant change in magnitude, or in temperature dependence, at this temperature. A method for calculating the Tg, of polymers from a knowledge of the chemical structure alone is therefore of great value in designing new polymers with desired properties and is of considerable theoretical interest. Many previous attempts have been reported, but the relations proposed have been limited in application, though usefully descriptive of specific polymer systems.

Sodium Metabishulphate as Antistatic Agent

Sodium metabisulphite is a kind of white or slightly yellow crystalline powder.

It is soluble in water, acidic aqueous solution. Besides, it also is soluble in glycerol, slightly soluble in ethanol. And it is easily decompose when sodium metabisulfite 97% becomes wet antistatic agent. When exposed in air it will easily oxidize into sulfate. Emit sulfur dioxide and generate the corresponding salts when Sodium pyrosulfite contacts with acid. Sodium metabisulfite 96.5% powder will decompose when heated to 150 ℃.