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首页> 外文期刊>Journal of Applied Polymer Science >Water retention in sandy substrates modified by cross-linked polymeric microgels and their complexes with a linear cationic polymer
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Water retention in sandy substrates modified by cross-linked polymeric microgels and their complexes with a linear cationic polymer

机译：通过交联聚合物微凝胶和与线性阳离子聚合物的交联聚合物微凝胶和它们的配合物改性的含沙基质的水保持

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摘要

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.
机译：以N-异丙基丙烯酰胺和丙烯酸（PAA#）的微凝胶共聚物及其具有不同表面电荷的间聚电解质复合物（IPEC#）为形式，测试了用于土壤抗侵蚀保护的新型合成土壤改良剂，以优化土壤基质两个样品的保水性和多孔结构。保水曲线（WRCs）被用作新聚合物材料处理土壤基质中持水能力的基本热力学指标。土壤水文常数、比表面积参数和孔隙分布曲线是通过作者修改的van Genueshen模型和Voronin方法从WRCs计算出来的。PAA#和阴离子IPEC#在1%（按重量计）的剂量下具有高膨胀度，可将石英砂的田间持水量、土壤有效含水量范围和比表面积增加5-6倍，同时将其结构重组为微孔优势。对于壤质砂，同样的处理效果较差，田间持水量增加了两倍，比表面积增加了两倍或三倍，由于萎蔫点参数的强烈增加，土壤有效水的范围几乎不变。弱溶胀线性聚丙烯酸和阳离子IPEC#对这两种矿物基质的性质没有显著影响。

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