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首页> 外文期刊>RSC Advances >Synthesis of a new kind of macroporous polyvinyl-alcohol formaldehyde based sponge and its water superabsorption performance
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Synthesis of a new kind of macroporous polyvinyl-alcohol formaldehyde based sponge and its water superabsorption performance

机译：新型大孔聚乙烯醇甲醛基海绵的合成及其吸水性能

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Novel superabsorbents based on hydrophilic and macroporous polyvinyl alcohol-formaldehyde (PVF) sponges are prepared through the grafting polymerization of hydrophilic acrylamide (AM) monomer on the PVF and PVF-GA (pre-crosslinked with glutaraldehyde) network and through subsequent partial hydrolysis under alkaline conditions. The grafting percentage (GP) increases with the feed ratio of [AM]/[OH] and can reach up to 160%. The hydrolysis degree ranges between 60% and 70%. As-prepared polyacrylamide grafted PVF (PVF-g-PAM) and PVF-GA (PVF-g-GAM), and corresponding hydrolyzed samples (PVF-g-PAA and PVF-g-GM) present average pore sizes ranging from 60 mu m to 90 mu m and a high porosity of 90%. Scanning electron microscopy (SEM) images reveal an interconnected pore structure, macroscopicay rough surface, and pore size ranging from several micrometers to 200 mu m. As-prepared sponges aka exhibit rapid absorption kinetics and they can reach absorption equilibrium in both deionized water and saline solution in 1 min. The absorption procedure described in this study is consistent with the pseudo second-order rate kinetic equation. Notably, the PVF-g-PM sponges can absorb deionized water as high as 320 g g(-1) within 60 s and can aka absorb saline solution at a maximum capacity of 97.3 g g(-1) in 30 s. As-prepared PVF-g-PAM sponges with an absorption capacity less than 50 g g(-1) exhibit excellent reusability for at least 20 cycles. And the absorption mechanism is aka discussed. Results show that these sponges with rapid absorption kinetics and high capacity can be considered as new superabsorbents for medical and sanitary applications.
机译：通过亲水性丙烯酰胺（AM）单体在PVF和PVF-GA（与戊二醛预交联）网络上的接枝聚合以及随后在碱性条件下的部分水解，制备了基于亲水性和大孔聚乙烯醇-甲醛（PVF）海绵的新型超强吸收剂条件。接枝率（GP）随进料比[AM] / [OH]的增加而增加，最高可达160％。水解度在60％至70％之间。制备的聚丙烯酰胺接枝PVF（PVF-g-PAM）和PVF-GA（PVF-g-GAM）以及相应的水解样品（PVF-g-PAA和PVF-g-GM）的平均孔径为60μ m至90μm，高孔隙率达90％。扫描电子显微镜（SEM）图像显示出相互连接的孔结构，宏观粗糙的表面，孔径范围从几微米到200微米。制备好的海绵又表现出快速的吸收动力学，它们可以在1分钟内在去离子水和盐溶液中达到吸收平衡。在这项研究中描述的吸收程序与伪二级速度动力学方程式一致。值得注意的是，PVF-g-PM海绵可以在60 s内吸收高达320 g g（-1）的去离子水，也可以在30 s内以97.3 g g（-1）的最大容量吸收盐溶液。吸收量小于50 g g（-1）的PVF-g-PAM海绵具有出色的可重复使用性，至少可循环20次。并讨论了吸收机理。结果表明，这些具有快速吸收动力学和高容量的海绵被认为是用于医疗和卫生应用的新型超吸收剂。

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