P（AM-DMDAAC-AA）两性聚电解质的合成及其对白水中Ca2+吸附性能的研究

Synthesis of AM-DMDAAC-AA Polyampholyte and its Application as Adsorbent of Calcium Ions in White Water

中文关键词:  水溶液共聚  两性高聚物  水溶性  特性黏数  Ca2+吸附量

Key Words:ternary polymerization  polyampholyte  water-soluble  intrinsic viscosity  Ca2+ adsorption capacity

中文摘要:

      以丙烯酰胺（AM）为分子骨架，丙烯酸（AA）和二甲基二烯丙基氯化铵（DMDAAC）分别为阴、阳离子单体，采用过硫酸钾（KPS）与偶氮二异丁脒盐酸盐（AIBA·2HCl）组成的复合引发体系，在水相中共聚合成了一种具有两性特征的水溶性高聚物P(AM-DMDAAC-AA)。通过考察单体质量分数、引发剂用量、单体配比等因素对产物特性黏数和Ca2+吸附性能的影响，确定了反应的最佳合成条件：单体摩尔比n（AM）∶n（DMDAAC）∶n（AA）=1∶0.3∶0.8，单体质量分数22.5%（单体总质量对反应体系总质量），引发剂用量0.2%（相对于单体总质量），其中KPS与AIBA·2HCl的质量比为3∶1，反应温度70~75℃，反应时间10 h。合成的聚合物特性黏数为231.48 mL/g，Ca2+吸附量最高能达到2.028 mmol/g。运用FT-IR和1H-NMR对聚合物结构进行了表征。

Abstract:

      Using acrylamide(AM) as the molecular backbone, acrylic acid(AA) as anionic monomer, and dimethyl diallyl ammonium chloride (DMDAAC) as the cationic monomer, complex of KPS and azo-compounds AIBA·2HCl as initiator, the water-soluble polyampholyte P(AM-DMDAAC-AA) was prepared in the aqueous solution. The influences of monomer concentration, dosage of initiator and monomer molar ratio on intrinsic viscosity and adsorption property of Ca2+ of the polyampholyte were investigated. The optimal conditions were found as follows: n(AM)∶n(DMDAAC)∶n(AA)=1∶0.3∶0.8, monomer concentration 22.5%, dosage of initiator 0.2%, while mass ratio of KPS and AIBA·2HCl 3∶1, reaction temperature 70~75℃, reaction time 10 h. Under these conditions, intrinsic viscosity of the polyampholyte was 231.48 mL/g, maximum adsorption capacity of Ca2+ was 2.028 mmol/g. The structure of the polymer was characterized and studied by the FT-IR and 1H-NMR.