Polymer medium, active

There are two principal types of monolithic device. If the active agent is dissolved in the polymer medium, the device is called a monolithic solution. Examples of this type of device are pesticide-containing cat and dog collars to control ticks and fleas. Such devices are often used when the active agent is a liquid some polymers [for example, poly(vinyl chloride)] can easily sorb up to 20 % or more of these liquids. However, if the solubility of the active agent in the... 

The sequence order and relative importance of elementary reactions in the process of chain oxidation depends markedly on temperature and microviscosity of a polymer medium. As some elementary reactions have different activation energies, the changes in temperature induce not only the changes in reaction rate but also in the composition of reaction products. 

The active polymer medium must exhibit Stimulated Emission (SE). 

Figure 11. Photograph of an optical correlator for security verification that uses a photorefiactive polymer as active medium.

Due to the feet, that metal ions are active, in the polymer medium they immediately appear in flic environment of the PVA molecules and form bonds with the hydroxyl groups of this polymer. Polyvinyl alcohol replicates the stmeture of the particle that it surrounds however, due to the tendency of the molecules of the metal salts or other metal compounds to combine, PVA as if envelopes the powder particles, and therefore the forms of the obtained nanostmetures can be different. The optical microscopy method allows to determine the stmeture of the nanocomposite at the early stage. 

Unlike DNQ—novolac resists, CA-resist imaging characteristics are determined to a significant extent by thermally activated bimolecular chemistry taking place during postexposure processing. Since the polymer serves here as the reaction medium, its properties and state induence the course and... 

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