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首页> 外文期刊>Journal of Applied Polymer Science >Hydrophobic-hydrophilic surface switching properties of nonchain extended poly(urethane)s for use in agriculture to minimize soil water evaporation and permit water infiltration
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Hydrophobic-hydrophilic surface switching properties of nonchain extended poly(urethane)s for use in agriculture to minimize soil water evaporation and permit water infiltration

机译：非洲延长聚（氨基甲酸酯）疏水 - 亲水表面切换性能，用于农业，以最小化土壤水蒸发，允许水渗透

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Preformed plastic films produced from nondegradable materials such as poly(ethylene) are widely used in agriculture to enhance crop production by modifying soil temperature, conserving soil water, and supressing weeds, but are generally removed and disposed of after each growing season. We aim to circumvent the need to retrieve and dispose of plastic films by using water-borne, degradable polymers that can be sprayed directly onto the soil surface to form a barrier to reduce soil water evaporation. We report the synthesis and characterization of a series of nonchain extended poly(urethane)s (PUs) for this purpose, that were prepared from poly(dimethylsiloxane) (928.3 g mol(-1)) and poly(ethylene glycol) (1020 g mol(-1)). These new materials undergo hydrophobic-hydrophilic switching of their surface properties when in contact with water, which we exploit as a means of minimizing water evaporation from soil when the polymer layer is dry (e.g., in sunny conditions), but permitting the infiltration of liquid water through the treatment into soil during rainfall or sprinkler irrigation. The surface wettability and restructuring phenomena leading to these fascinating properties are intensively investigated using water contact angle measurements, surface-free energy estimates and depth profiling X-ray photoelectron spectroscopy (XPS). Laboratory pot trials demonstrate that soil water evaporation reduced by more than 70% when soil was treated with a low loading of the polymer. (C) 2016 Wiley Periodicals, Inc.
机译：从诸如聚（乙烯）之类的诸如聚（乙烯）之类的诸如聚（乙烯）的预成型塑料薄膜广泛用于农业，以通过改变土壤温度，保护土壤水和抑制杂草来增强作物产量，但通常在每个生长季节后被移除和处理。我们的目标是通过使用可以直接喷涂到土壤表面上的水性可降解的聚合物来避免检索和处理塑料薄膜以形成屏障以减少土壤水蒸发的屏障。我们报告了一系列非洲延长聚（氨基甲酸酯）S（PUS）的合成和表征为此目的，该方法由聚（二甲基硅氧烷）（928.3g mol（-1））和聚（乙二醇）（1020g mol（-1））。当与水接触时，这些新材料经历了它们的表面性质的疏水性 - 亲水性切换，因为当聚合物层干燥（例如，在阳光明媚的条件下）时，我们将其表面性能最小化土壤中的水蒸发最小化的手段，但允许液体渗透液体在降雨期间通过治疗到土壤中的水或喷水灌溉。使用水接触角测量，无表面能量估计和深度分析X射线光电子谱（XPS）密集地研究导致这些迷人性能的表面润湿性和重组现象。实验室盆栽试验表明，当用低负荷的聚合物处理土壤时，土壤水蒸发减少了70％以上。 （c）2016 Wiley期刊，Inc。

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