MULTIFUNCTIONAL SOIL AMENDMENT BASED ON ULTRA-RARELY CROSSLINKED BIODEGRADABLE COPOLYMER

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

Авторы: Ilyasov Leonid, Khrabrov Nikolay, Panova Irina
Сборник: ABSTRACT BOOK of 7th Congress of Federation of Asian Polymer Societies FAPS2021
Тезисы
Год издания: 2021
Место издания: Институт химии ДВО РАН Владивосток
Первая страница: 55
Последняя страница: 55
Аннотация: There are two main directions of applyingpolyelectrolytes as soil amendments: the first oneis to use linear polymers. When the soil surface istreated with their solutions, polymer-soil coatingsare formed that protect the soil from erosion.However, linear polymers do not directly improvethe water-holding capacity of soils. The seconddirection is associated with the use of hydrophiliccross-linked polymers of network structure, whichform hydrogels capable of long-term moistureretention, when swollen in an aqueous medium.They improve the water regime of soils, preventwater evaporation and its gravitational runoff. Butsuch amendments do not have the ability tostabilize the soil structure and do not contribute tothe improvement of the mechanical stability ofsoil. At the same time, there are only few examplesof polymeric conditioners with combined effect onsoils, which are capable of solving both describedproblems.This work highlights a super-light-crosslinkedcopolymer of acrylamide, potassium acrylate,containing biodegradable starch fragments (AMAK-Starch #), as a multifunctional soilamendment. The content of the crosslinking agent,N, N-methylene-bis-acrylamide, amounted 0.036%by weight. The polymer was synthesized by radicalpolymerization in a block and milled after drying,with granules of <0.25 mm diameter. We used acommercial copolymer of acrylamide andpotassium acrylate, containing 0.2 wt% of thecrosslinking agent, with granules of the same sizeas a comparison sample.The content of carboxyl groups in copolymers,determined by potentiometric titration, amounted2.2 ∙ 10-3 mol / g for commercial sample and 6.4 ∙10-3 mol / g for AM-AK-Starch #.It was shown that the swelling properties of crosslinked polyelectrolytes strongly depend on theconditions of spatial restrictions. In the absence ofsuch restrictions, the copolymer with a highcontent of carboxyl groups and a lower proportionof a crosslinking agent, AM-AK-Starch#,exhibited higher swelling ratio. When copolymersare placed in the bulk of soil substrates, theadvantage has passed to commercial sample,which contains a smaller amount of carboxylgroups, but a larger proportion of the crosslinkingagent. The effect obtained is associated with thecontribution of the stiffness of the polymernetwork to polyelectrolyte swelling underconditions of limited space and external pressure.At the same time, both copolymers increased therange of moisture available to plants in sand andsoil with low hydrophysical characteristics to thelevel of well-aggregated fertile loamy soils atapplication rates of ~ 0.15-0.8 wt%. When 1 wt%AM-AK-Starch # suspension was sprayed over thesoil surface, protective coatings were formed,resisting the action of storm wind and waterstreams. Commercial sample was not able to formprotective coatings.This work was supported by the RussianFoundation for Basic Research (grant number 19-29-05036 MK).
Добавил в систему: Ильясов Леонид Олегович

	ИСТИНА	Войти в систему Регистрация
	Интеллектуальная Система Тематического Исследования НАукометрических данных
	Главная Поиск Статистика О проекте Помощь

ИСТИНА

Интеллектуальная Система Тематического Исследования НАукометрических данных

MULTIFUNCTIONAL SOIL AMENDMENT BASED ON ULTRA-RARELY CROSSLINKED BIODEGRADABLE COPOLYMERтезисы доклада Тезисы

Прикрепленные файлы