材料期刊网

采用溶液共混法制备了聚丙烯酰胺（PAM）/蒙脱土（MMT）复合导水涂层材料。通过粒度分布（PSD）、环境扫描电镜（ESEM）、X射线衍射（XRD）、热重分析（TGA）对材料进行了表征。研究了材料在不同土壤环境中的导水特性,并考察了现场应用对苗木成活率的影响。研究结果表明,单体丙烯酰胺（AM）的进入使MMT的层间距增大到2.0022 nm;MMT颗粒均匀分散在PAM网络结构中,降低了PAM的保水能力从而有利于水分的运移;导水涂层材料能够根据土壤温度和湿度的变化自调节导水速率;应用该材料制备的蓄水渗膜现场植树试验苗木成活率达到了92.1%。

Composite water-transmitting coating composed of polyacrylamide（PAM） and montmorillonite（MMT） was synthesized by aqueous solution polymerization.The composite coating was characterized by means of particle size distribution（PSD）,field emission scanning electron microscope（ESEM）,X-ray diffraction（XRD）and thermogravimetric analysis（TGA） measurements.The self-regulating water conductivity properties at different soil temperature and humidity were studied.The application effect of composite coating in sampling planting in drought areas was also inspected.The results show that AM intercalate into the layers of MMT and the interlayer spacing increases up to 2.0022 nm.MMT particles disperse evenly throughout the PAM network and the water-retaining property of PAM deceases in the presence of MMT particles,which is beneficial to water conductivity.The composite water-transmitting coating can self-regulate water conductivity with changes of soil temperature and humidity.The survival rate of samplings in field test using the water-storage and controlled-releasing film（WSCF） prepared by the composite coating is significantly enhanced up to 92.1%.