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正电子湮没技术作为一种无损的微结构检测方法在高分子/层状硅酸盐纳米复合材料中具有广泛的应用前景。本研究利用正电子湮没寿命谱学方法,对丙烯酸接枝前后高密度聚乙烯和蒙脱土的纳米复合材料的微结构进行了表征。实验发现,丙烯酸的接枝导致了o-Ps强度的减小。纳米复合材料中o-Ps强度及o-Ps寿命分布随蒙脱土含量增加的变化,证实了极性丙烯酸基团优先进入了蒙脱土片层之中。
Positron annihilation (ANN) as a non-destructive microstructure detection method has a wide range of applications in polymer / layered silicate nanocomposites. In this study, the positron annihilation lifetime spectroscopy method was used to characterize the microstructure of high density polyethylene and montmorillonite nanocomposites before and after acrylic acid grafting. It has been found experimentally that the grafting of acrylic acid leads to a decrease in the o-Ps intensity. The change of o-Ps intensity and o-Ps lifetime distribution in nanocomposites with the increase of montmorillonite content confirmed that the polar acrylic groups preferentially entered the montmorillonite layer.