CHEM 1102 Lecture Notes - Lecture 3: Sodium Polyacrylate, Polyacrylonitrile, Polystyrene
29 Dec 2015
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Document Summary
Experiment 15 post-lab: the polystyrene that we made a light yellow in color, solid, and crystal-like. Similarly, the glyptal resin was a honey yellow color, yet very viscous; after crushing it with a mortar and pestle, it also had a crystal-like structure. The main difference between the polystyrene and the glyptal resin was the solubility of each polymer; in water, both polystyrene and the glyptal resin were insoluble. However, in acetone, polystyrene was insoluble while the glyptal resin was soluble: degreeof polymerization= =172. 84 173: in the synthesis of glyptal resin, cross-linking hardened the compound; it turned from a liquid to a clear, transparent solid. With elmer"s glue, cross-linking altered the strength, bounciness and stretchiness of the polymer. In the last part with sodium polyacrylate, cross-linking allowed the polymer to absorb a greater amount of water: the double bonds between the two carbon atoms in acrylonitrile change into one single bond in polyacrylonitrile.
