CMS-g-PAA高吸水性复合材料的制备及性能研究

以废弃全棉面膜基布(CMS)和丙烯酸(AA)为原料,采用自由基溶液聚合法制备CMS-g-PAA复合高吸水性材料,并用红外光谱(FTIR)进行表征。研究了吸水性、保水性及反复吸放液性能,采用准一级、二级动力学模型对其吸水溶胀过程进行模拟研究。结果表明,全棉面膜基布和丙烯酸单体之间发生了接枝共聚反应,所合成的CMS-g-PAA复合材料在去离子水和0.9%(质量分数)NaCl溶液的吸水倍率分别可达211.3g/g和45.5g/g,且溶胀过程符合准二级动力学吸附模型。在较高温度和一定压力下,CMS-g-PAA均具有良好的保水性能。反复吸放液性能测试表明循环8次后,去离子水和0.9%(质量分数)NaCl溶液的吸水倍率分别保持了最大吸水倍率的64.9%和44.4%。

Synthesis and Properties of Cotton Mask Substrate Grafted PAA Superabsorbent Composites

CMS-g-PAA superabsorbent composite was synthesized through free-radical aqueous copolymerization, using waste cotton facial mask substrate (CMS) and acrylic acid (AA) as raw materials. Meanwhile, the microstructure of CMS-g-PAA was characterized by means of FTIR. The capacity of liquid absorption and water-retention properties and reusability of the superabsorbent composite were also studied, and the model of pseudo-first-order and pseudo-second-order swelling kinetic were used to simulate the kinetic swelling property of the polymers, respectively. The results indicate that the grafting copolymerization reaction occurred between CMS and acrylic acid monomer. The obtained CMS-g-PAA had the best absorbency of 211.3 g/g in distilled water and 45.5 g/g in 0.9 wt% NaCl solution, respectively. The pseudo-second-order kinetic equation is suitable for simulation of the adsorption processes. Moreover, the CMS-g-PAA showed excellent water retention capability under the condition of high temperature or high pressure. In addition, the absorbencies ability in distilled water and 0.9 wt% NaCl aqueous solution via eight cycles remained about 64.9% and 44.4% of the original maximum value.