SPARSELY CROSSLINKED BIODEGRADABLE HYDROGEL AS A MULTIFUNCTIONAL SOIL AMENDMENT

Ilyasov, L.; Khrabrov, N.; Panova, I.

Авторы: Ilyasov Leonid, Khrabrov Nikolay, Panova Irina
Сборник: BOOK OF ABSTRACTS 3rd International and 15th National Congress SOILS FOR FUTURE UNDER GLOBAL CHALLENGES
Тезисы
Год издания: 2021
Место издания: Serbian Society of Soil Science Belgrade
Первая страница: 84
Последняя страница: 84
Аннотация: While using polyelectrolytes as soil ameliorants, there are two main directions. The first is theuse of linear polymers: when treating the surface of soils with their solutions, a protectivepolymer-soil cover is formed, which prevents the spread of dust by the wind, erosion by waterflows and mechanical destruction of soils in general. However, linear polymers do not directlyaffect the water-holding capacity of soils. This is where the second direction takes place: theuse of hydrophilic covalently crosslinked polymers with network structure, which, whenswollen in an aqueous medium, form hydrogels capable of long-term moisture retention, andwhen mixed with soil, significantly increase soil moisture retention, prevent water evaporation.However, such ameliorants, in turn, do not have the ability to form protective polymer-soilcompositions, and do not contribute to the improvement of mechanical stability of soils. Itshould be noted that there are almost no descriptions of complex acting polymeric soilconditioners that cope with both described tasks at once. This paper presents the results of theuse of super-readily cross-linked hydrogel as a soil ameliorant with a complex action that hasthe ability to biodegradation. For this purpose, a crosslinked copolymer based on acrylamide,potassium acrylate and starch (biodegradable component) was obtained, hereinafter - AM-AKStarch #. N, N-methylene-bis-acrylamide was used as a crosslinking agent; its mass content inthe monomer mixture was 0.036 wt%. After the synthesis of the polymer in the block, it wascrushed and divided into two fractions: <0.25 mm and 0.25-0.5 mm. For comparison, we alsoused a commercial medium crosslinked hydrogel (SNF, France), a copolymer of acrylamideand sodium acrylate, which was ground and fractionated in a similar way. The maximumdegree of swelling of AM-AK-Starch # is 2-3 times higher than that of commercial one, whichis explained by a lower degree of crosslinking and a higher degree of ionization. However, inexperiments with quartz sand and sandy loam soil, it was found that the sparsely cross-linkedhydrogel is unable to resist the pressure of the outer layers of the soil. Therefore, its degree ofswelling drops sharply compared to the average cross-linked commercial one. Nevertheless,AM-AK-Starch # showed decent indicators for improving the water-holding properties ofsoil/sand in the range of mass contents of 0.5-1 wt.%. In addition, it was further shown that thecommercial hydrogel is not capable of forming a single polymer-soil composition resistant tomechanical stress, while AM-AK-Starch # formed a single stable polymer-soil crust. Thus, soilcomposites based on commercial sample were unable to withstand water and air flows, almostcompletely collapsing, and crusts based on AM-AK-Starch # retained their integrity even whenexposed to wind up to 30 m/s.Keywords: soil erosion, water retention, hydrogels, soil amendmentsThis work was supported by the Russian Foundation for Basic Research (grant number 19-29-05036 MK)
Добавил в систему: Ильясов Леонид Олегович

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