以丙烯酰胺(AM)为单体,N,N'-亚甲基双丙烯酰胺为交联剂,亚硫酸钠-过硫酸铵为引发剂,采用水溶液聚合法制备聚丙烯酰胺(PAM)吸湿材料.系统研究了单体浓度、交联剂用量和水解度等聚合条件对其吸湿性能的影响.吸湿实验表明,PAM的吸湿性能优于传统的无机吸湿材料硅胶和分子筛.采用聚乙二醇(PEG)、碳酸钙(CaCO_3)两种致孔剂合成多孔PAM,并与PAM的吸湿性能进行对比.实验结果知PAM/PEG的吸湿速率比PAM提高50%以上,吸湿容量也显著提高;而PAM/CaCO_3的吸湿效果并不理想.热失重分析TGA得出PAM/PEG比PAM的热稳定性稍稍降低,而PAM/CaCO_3的热稳定性则稍稍提高.
In this paper,polyacrylamide (PAM) was synthesized with acrylamide as monomer,N,N'-methylene bisacrylamide as crosslinking agent ,sodium sulfite and ammonium persulfate as initiator by means of aqueous solution polymerization.The factors such as monomer concentration,hydrolysis degree,crossing-linking agent concentration and so on influencing on moisture absorbency were systematically investigated.Under the condition of T=20℃,RH=90%,the moisture absorption property of PAM was obviously better than the traditional materials,such as silica gel and molecular sieve.PAM/PEG and PAM/CaCO_3 porous materials were synthesized by using polyethylene glycol and calcium carbonate as pore-foaming agent respectively.Experimental results indicated that the moisture absorption rate of PAM/PEG was increased by more than 50% and its moisture absorption capacity was markedly improved than PAM too.Nevertheless,the moisture absorption ability of PAM/ CaCO_3 was not satisfactory.TGA analysis verified that the thermal stability of PAM/PEG was decreased but PAM/CaCO_3's got improved.
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