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Ionic polymerizations, especially cationic polymerizations, are not as well understood as radical polymerizations because of experimental dif culties involved in their study The nature of the reaction media in ionic polymerizations is often not clear since heterogeneous inorganic initiators are often involved Further, it is extremely dif cult in most instances to obtain reproducible kinetic data because ionic polymerizations proceed at very rapid rates and are extremely sensitive to the presence of small concentrations of impurities and other adventitious materials The rates of ionic polymerizations are usually greater than those of radical polymerizations These comments generally apply more to cationic than anionic polymerizations Anionic systems are more reproducible because the reaction components are better de ned and more easily puri ed Cationic and anionic polymerizations have many similar characteristics.

111 PREDICTION OF LOSS CHARACTERISTICS FOR LAND RADIO LINKS As was mentioned in 5, the proposed 3D multiparametric model is the stochastic approach that combines a statistical description of the terrain and overlay pro le of the buildings with a description of the signal strength and average intensity based on the theoretical description of wave propagation phenomena in random media (see s 3 and 4) Here, speci c features of the land communication channels based on multiple re ections, diffraction, and scattering are described, caused by various obstructions as well as accounting for their vertical and horizontal re ection characteristics (see 5) It should be pointed out that using the multiparametric stochastic approach, we cannot give exact, point-to-point description of signal strength surrounding each individual obstruction, which can be easily obtained by the use of ray tracing approaches [1 4].

Both depend on the formation and propagation of ionic species, a positive one in one case and a negative one in the other The formation of ions with suf ciently long lifetimes for propagation to yield high-molecular-weight products generally requires stabilization of the propagating centers by solvation Relatively low or moderate temperatures are also needed to suppress termination, transfer, and other chain-breaking reactions which destroy propagating centers Although solvents of high polarity are desirable to solvate the ions, they cannot be employed for several reasons The highly polar hydroxylic solvents (water, alcohols) react with and destroy most ionic initiators Other polar solvents such as ketones prevent initiation of polymerization by forming highly stable complexes with the initiators Ionic polymerizations are, therefore, usually carried out in solvents of low or moderate polarity such as tetrahydrofuran, ethylene dichloride, and pentane, although moderately high polarity solvents such as nitrobenzene are also used.

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In such solvents one usually does not have only a single type of propagating species For any propagating species such as BA in cationic polymerization, one can visualize the range of behaviors from one extreme of a completely covalent species (I) to the other of a completely free (and highly solvated) ion (IV).

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