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By A A Askadskii

An method of the quantitative research of the influence of the chemical constitution of linear and community polymers on their homes is defined. The process relies at the illustration of the repeating unit of the polymer within the kind of a suite of an harmonic oscillators which describe the thermal movement of atoms within the box of intra- and intermolecular forces, together with susceptible dispersion forces, dipole-dipole interactions, hydrogen and valency bonds. machine courses in accordance with this technique also are provided. they are often used for calculating greater than 50 primary actual and chemical constants of linear and community polymers in addition to low molecular drinks. The courses give the chance to unravel a right away challenge, i.e. quantitative review of the actual houses of polymers in line with their chemical nature, and a opposite challenge, i.e. computing device synthesis of polymers with the prescribed actual homes.

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Therewith, the intensity of the long-term component, I2, formed due to positron annihilation on defects, decreases, too. Growth of the lifetime τ2 may be explained by coagulation (consolidation of small defects into larger ones) during recovery or fast relaxation of small pores and, consequently, by growth of the average capture radius. As indicated in estimations, the concentration of microdefects after partial relaxation decreases more than 7-fold. Therewith, the free volume induced by deformation decreases by a factor of 4 [48].

Used in gel-chromatography and production of ion exchangers, the volume of pores is very important, together with their size distribution, specific surface. Let us present the definition, given in ref. [68]: “Pores are emptinesses or cavities in solids usually connected with each other. They possess various and different form and size, determined significantly by nature and the way of obtaining absorbents”. Usually, the characteristics of a microporous structure are judged by experimental data on equilibrium adsorption, capillary condensation of vapor and mercury pressing in (mercury porosimetry) [121].

Capillary condensation is absent. Then, the total volume of pores calculated by the amount of sorbate penetrated into the polymeric substance will be smaller than the true volume of macropores. cr. is the specific volume of the ideal crystal or bulky amorphous polymer (a bulky amorphous polymer is the one in which no sorbate molecule can penetrate into its pores). 21) VE = VT – VW. 22) Next, let connect these characteristics with the coefficient of molecular packing k (see above): k = VW/VT; 1 – k = VE/VT.

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