| 引用本文: | 钟辉,黄红军,万红敬,王晓梅.多孔聚丙烯酸钠树脂吸湿动力学与热力学研究[J].材料科学与工艺,2017,25(4):17-24.DOI:10.11951/j.issn.1005-0299.20160313. |
| ZHONG Hui,HUANG Hongjun,WAN Hongjing,WANG Xiaomei.Study on moisture absorption kinetics and thermodynamics of porous sodium polyacrylate resin[J].Materials Science and Technology,2017,25(4):17-24.DOI:10.11951/j.issn.1005-0299.20160313. |
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| 摘要: |
| 为改善树脂吸湿性能，充分发挥树脂在吸湿领域的实际应用，本文系统分析了多孔聚丙烯酸钠树脂的吸湿过程及吸湿机理.通过测定多孔树脂在不同湿度下的吸湿量，得到其吸湿等温线，并确定其吸附类型；测定树脂在80%相对湿度下的吸湿曲线，采用动力学理论分析树脂吸湿速率，并与无孔聚丙烯酸钠树脂吸湿速率进行比较；测定树脂在不同温度下的吸湿量计算其吸湿热力学参数，研究树脂吸湿所能到达的程度.结果表明：树脂满足Ⅲ型吸附等温线，对吸附等温线进行线性拟合，树脂吸湿过程可用Freundlich吸附等温式进行描述；树脂吸湿符合二级吸附动力学模型，且多孔聚丙烯酸钠树脂的吸湿速率明显高于无孔聚丙烯酸钠树脂；树脂吸湿过程的焓变、熵变、吉布斯自由能变化均小于零，说明树脂吸湿过程是放热自发的.研究发现：树脂吸湿过程同时包含物理吸附和化学吸附，且以化学吸附为主；多孔结构的存在有利于提高树脂吸湿速率；降低温度有利于树脂吸湿.
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| 关键词: 多孔聚丙烯酸钠 吸湿 动力学 热力学 Freundlich吸附等温式 |
| DOI：10.11951/j.issn.1005-0299.20160313 |
| 分类号:TQ328.3 |
| 文献标识码:A |
| 基金项目:国家自然科学基金资助项目(51103178). |
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| Study on moisture absorption kinetics and thermodynamics of porous sodium polyacrylate resin |
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ZHONG Hui,HUANG Hongjun,WAN Hongjing,WANG Xiaomei
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(Department of Physics and Chemistry, Ordnance Engineering College, Shijiazhuang 050003, China)
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| Abstract: |
| In order to improve the moisture absorption of the sodium polyacrylate resin and the practical application in the field of the moisture absorption, the moisture absorption process and mechanism of the porous sodium polyacrylate resin were analyzed systematacially. The absorption isotherm was obtained by testing the moisture absorption of the resin under different humidity to determine the adsorption type. The moisture absorption curve of the resin in 80% relative humidity was measured, and the absorption rate obtained by the dynamics analysis was compared with that of non-porous sodium polyacrylate resin. The thermodynamic parameters of the moisture absorption were also obtained according the content of moisture absorption in different temperature to analyze the degree of moisture absorption. The result shows that the absorption isotherm is the type Ⅲ adsorption isotherm, and Freundlich absorption model can be used to describe the moisture absorption of the resin according to the linear fitting data. Moreover, pseudo-second absorption model is more suitable to describe the absorption process, and it also can be concluded that the absorption rate of porous sodium polyacrylate resin is significantly higher than that of non-porous sodium polyacrylate resin. The enthalpy change, entropy change and the change of free enthalpy of the absorption process are less than zero, which indicates that the moisture absorption process is a spontaneously exothermic process. The moisture absorption involves physical absorption and chemisorption, and the latter is the main absorption way. Meanwhile, the porous structure is beneficial to improve the absorption rate of resin, and lowering temperature can facilitate the moisture absorption of resin.
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| Key words: porous sodium polyacrylate moisture absorption kinetics thermodynamics Freundlich absorption model |
