Clever Putty - non-Newtonian fluid or solid?

>> Saturday, 10 September 2016

In weekend, silly, inadequately age. Once again the same, but so different embodiment. Commercially it is called Clever Putty chemical is a mixture of polydimethylsiloxane (ang. Polydimethylsiloxane, PDMS) (a polymer built of alternating silicon and oxygen atoms in the main chain and the methyl groups (-CH3)), and of bromine, mechanically / non-Newtonian rheological material and more specifically dilatant (compacted shear). And really who it draws attention? Important that thrown bounces (elastic body), extends stretched slowly, breaking the tension quickly (liquid dilatantny), left "flows" (viscous liquid).

A mechanism? They arise after the molecular structure of matter. Not discussed and the relevant properties are known as thickening shear, that is, increase in viscosity with increasing shear rate. You can buy it in the form of ready-made Clever Putty toys, or obtain directly from the manufacturer mix Dow Corning 3179 Dilatant Compound (additional ingredients are fillers, pigments, etc.) and you can do it yourself.

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