Zn-PMA掺杂改性纤维素水凝胶的保水性能

Effect of Zn-PMA Doping Modification on Water Retention Performance of Cellulose Hydrogel

利用掺杂法对纤维素水凝胶进行复合改性,采用红外光谱仪、X射线衍射仪和扫描电镜表征其结构,研究不同因素对改性纤维素水凝胶保水性能及可重复利用性的影响。实验结果表明,Zn-PMA改性纤维素水凝胶的保水率可以达到3936.78%,与纯纤维素水凝胶相比,提高了1367.47%。保水性实验结果表明,改性纤维素水凝胶的最佳保水条件是Zn-PMA掺杂量为1%、pH=12、盐溶液浓度为4 mmol/L,并且其保水效果与盐溶液浓度呈现反比关系。耐温性实验结果表明,在40℃下,使用140 min,掺杂量为1%的改性纤维素水凝胶的保水率依旧保持在50%以上。重复利用性测试结果表明,当改性纤维素水凝胶重复使用3次时,保有率最高仍可以达到70.04%。

The cellulose hydrogel composite was modified by doping method with Zn-PMA.The chemical structure was characterized by infrared spectrometer,X-ray diffractometer and scanning electron microscope,and the improvement of water retention performance and the recyclable properties of modified cellulose hydrogel by different influencing factors was studied.The experimental results found that the water retention rate of Zn-PMA modified cellulose hydrogel reached 3936.78%,which was an increase of 1367.47%compared with pure cellulose hydrogel.Water retention experiments showed that the best water retention conditions for modified cellulose hydrogels are 1%Zn-PMA doping,pH=12,and salt solution concentration 4 mmol/L,and it's water retention effect was inversely proportional to the concentration of the salt solution.The temperature resistance experiment showed that the water retention rate of the modified cellulose hydrogel with 1%doping content could still maintain more than 50%when used for 140 min at 40℃.The recycling test showed that the modified cellulose hydrogel was reused 3 times,and the retention rate was still as high as 70.04%.