几种阳离子度PDA共聚物的合成

以丙烯酰胺(AM)和工业单体二甲基二烯丙基氯化铵(DMDAAC)为原料,过硫酸铵(APS)和亚硫酸氢钠(RH)复合物为引发体系,采取一次性加料方法,以特征黏度为考核指标,对几种阳离子度二甲基二烯丙基氯化铵与丙烯酰胺的共聚物PDA进行了制备工艺研究。通过正交优化等实验方法考察了单体起始质量分数、引发剂用量和聚合反应温度3个因素对选定的每一种阳离子度PDA共聚合反应结果的影响,得到了制备系列化具不同阳离子度PDA的各自最佳点的制备工艺条件,比较了在各阳离子度条件下,最佳制备工艺点时单体起始质量分数、引发剂用量和聚合反应温度的变化规律。结果表明,对于制备5%、10%、20%、30%和50%阳离子度的PDA产物,当单体起始质量分数分别为16%、18%、25%、35%和65%,引发剂用量占单体的质量分数分别为8.62×10-5、8.82×10-5、7.35×10-5、5.40×10-5和9.19×10-5,聚合反应温度分别为25、30、30、30℃和25℃时,特征黏度可分别达到17.0、15.0、11.6、9.0 dL/g和6.2 dL/g。此外还对共聚产物PDA进行了红外光谱结构表征。该工艺简单方便、清洁安全,适合于工业化生产。

Studies on Synthesis of PDA with Different Cationicities

Initiated by ammonium persulfate/sodium bisulfate redox complex,preparation technologies of PDA,the copolymer of dimethyldiallyl ammonium chloride(DMDAAC) and acrylamide(AM),with different cationicities were researched by one-stage addition of the monomers AM and industrial DMDAAC using the intrinsic viscosity as quality criterion.The results show that intrinsic viscosity of PDA with cationicity of 5%,10%,20%,30% and 50% could be up to 17.0 dL/g,15.0 dL/g,11.6 dL/g,9.0 dL/g and 6.2 dL/g respectively,when the starting monomer concentration was 16%,18%,25%,35% and 65%,the ratio of initiator mass to monomer mass was 8.62×10-5,8.82×10-5,7.35×10-5,5.40×10-5 and 9.19×10-5,and the reaction temperature was 25 ℃,30 ℃,30 ℃,30 ℃ and 25 ℃,respectively.Structures of PDA were characterized by IR spectrum.