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Water retention in sandy substrates modified by cross‐linked polymeric microgels and their complexes with a linear cationic polymer
Author(s) -
Smagin Andrey,
Panova Irina,
Ilyasov Leonid,
Ogawa Kazuyoshi,
Adachi Yasuhisa,
Yaroslavov Alexander
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50754
Subject(s) - polyacrylic acid , water retention , materials science , chemical engineering , swelling , acrylic acid , water content , soil water , polymer , microporous material , polyelectrolyte , permanent wilting point , water retention curve , field capacity , composite material , copolymer , soil science , geotechnical engineering , environmental science , geology , engineering
Abstract New synthetic soil conditioners for anti‐erosion protection of soils in the form of microgel copolymers of N ‐isopropylacrylamide and acrylic acid (PAA#) and their interpolyelectrolyte complexes (IPEC#) with different surface charges are tested for optimization of water retention and porous structure in two samples of soil substrates. Water retention curves (WRCs) are used as a fundamental thermodynamic indicator of water holding capacity in soil substrates treated by new polymeric materials. Soil‐hydrological constants, as well as specific surface parameters and pore distribution curves are calculated from the WRCs using the van Genuhten model and the Voronin method in the author's modification. PAA# and anionic IPEC# with high swelling degree at a dose of 1% (by weight) increase field water capacity, available soil water range and specific surface area by 5–6 times for quartz sand, along with reorganizing its structure towards micropore dominance. For loamy sand, the same treatment was less effective with a twofold increase in field moisture capacity, double or triple increase of specific surface area, and an almost constant range of available soil water due to the strong increase of wilting point parameter. Weakly swelling linear polyacrylic acid and cationic IPEC# did not significantly affect properties of both mineral substrates.