【摘要】 选聚丙烯酸钠(PAA)、聚丙烯酰胺(PAM)、丙烯酸-甲基丙烯酸共聚物P(AA-MA)、丙烯酸-丙烯酰胺共聚物P(AA-AM)、丙烯酸-甲基丙烯酸-丙烯酰胺共聚物P(AA-AM-MA),系统研究其吸湿过程和机理。吸湿性能的测试结果表明,硅胶和分子筛10 h内便饱和,有机高分子吸湿材料仍能持久吸湿,其饱和吸湿容量比硅胶提高至少6%以上,比分子筛提高至少50%以上,吸湿速率快于硅胶和分子筛。吸附动力学实验表明,有机高分子吸湿材料的吸湿主要遵循准二级动力学模型,吸湿率受湿度和高分子树脂自身的吸附性能影响。Freundlich吸附等温模型证实有机高分子吸湿材料吸湿并非单层吸附,而是物理吸附和化学吸附同时发生,且多以化学吸附为主。热力学分析得该吸湿过程为吸热反应且可自发进行。更多还原

【Abstract】 Adsorption process and mechanism of sodium polyacrylate,polyacrylamide,poly(acrylate acid-co-methacrylate),poly(acrylic acid-co-acrylamide) and poly(acrylate acid-methacrylate-acrylamide) were investigated.The experiments indicate silica gel and molecular sieve approaches hygroscopic balance in 10 h.But organic moisture absorbents can lastly keep moisture adsorption and moisture absorbency is increased by 6% than of silica gel,50% than of molecular sieve.Moisture absorption rate is faster than of others.The data shows the process is described by pseudo-second-order model,influenced by moisture and adsorption properties.Freundlich model demonstrates process isn′t single-layer adsorption,including physical and chemical adsorption,the chemical adsorption is major.By thermodynamics analysis,the process is endothermic and spontaneous reaction.更多还原