Water election density

As a typical example we illustrate in Figure 2-1 the electron density of the water molecule in two different representations. In complete analogy, p(x) extends the election density to the spin-dependent probability of finding any of the N electrons within the volume element dr, and having a spin defined by the spin coordinate s. 

Acrylamide copolymer POLYSWELL was applied as a lydrophilic filler. The acrylamide copolymer is a white grannlar material, density is 0.8-1.0 g/cm, water-swellable to form a polymer gel. In solutions the amide group shows weak-basic properties at the expense of the lone election pair on the nitrogen atom that is the reason of nonchemical interaction of the polymer with water. 

The carbocation formed by loss of water is resonance stabilized by the lone pair elections of nitrogen in the same way that the lone pair electrons of oxygen stabilize the oxocarbocation intermediate in the formation of acetals. However, nitrogen is more effective in stabilizing the carbocation because it is less electronegative than oxygen and is better able to supply electron density by resonance. 

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