Specific surface area of strongly swelling polymer hydrogels for agricultureстатья
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Дата последнего поиска статьи во внешних источниках: 13 мая 2020 г.
Аннотация:The study is the first attempt in soil physics to estimate the effective specific surface
area of strongly swelling polymer hydrogels as soil conditioners of a new generation. Along
with the standard assessment of water vapor desorption isotherms by the BET method, a new
method for determining the specific surface area deduced from the slope of water retention
curves was used. Water desorption isotherms and water retention curves were obtained by a
dynamic sorption equilibrium method and by a new method of thermodesorption. The specific
surface area values of synthetic polymer hydrogels ranged from 468 to 1029 m2/g. An
innovative Russian product VM-P with amphiphilic filler in the form of dispersed peat had the
maximum specific surface area among all studied types of hydrogels. Water absorption
properties and dispersion of gels have a hysteresis caused, presumably, by the dynamics of
dispersion in the cycles of wetting-drying.