MnCl_2/NaHSO_3引发丙烯酰胺-二甲基二烯丙基氯化铵共聚反应

Copolymerization of acrylamide and dimethyl diallyl ammonium chloride with MnCl_2/NaHSO_3 as initiator

以丙烯酰胺（AM）与二甲基二烯丙基氯化铵（DMDAAC）为单体,MnCl_2/NaHSO_3为引发体系,通过水溶液聚合得到AM/DMDAAC共聚物;利用IR和~1H NMR等方法分析共聚物的结构,考察了反应条件对AM/DMDAAC共聚物性能的影响。表征结果显示,AM/DMDAAC共聚物为目标产物。实验结果表明,合成AM/DMDAAC共聚物适宜的反应条件为：引发温度30℃、反应时间4h、n（AM）∶n（DMDAAC）=5∶1、单体用量25%（w）（基于反应体系质量）、n（MnCl_2）∶n（NaHSO_3）=1∶1、引发剂用量为单体质量的0.1%、引发剂采取固体投料方式。在该反应条件下,AM/DMDAAC共聚物的特性黏数为4.92 d L/g、阳离子度为11.30%、收率为45.66%。将MnCl_2/NaHSO_3引发体系与过硫酸铵复配引发共聚,能进一步提高AM/DMDAAC共聚物的收率、特性黏数和阳离子度。

A copolymer of acrylamide（AM）/dimethyl diallyl ammonium chloride（DMDAAC） was synthesized from AM and DMDAAC through water solution copolymerization with MnC12/NaHSO3 as initiator. The copolymer was characterized by means of IR and 1H NMR. The effects of reaction conditions on the properties of the copolymer were investigated. It was indicated that, under the optimal reaction conditions of initiating temperature 30℃, reaction time 4 h, n（AM） ： n（DMDAAC） 5 ： 1, monomer dosage 25%（w）（based on the mass of the reaction system）, n（MnC12） ： n（NaHSO3） 1 ： 1, initiator dosage 0.1% （based on the mass of the monomers） and solid feeding, the yield, intrinsic viscosity and cationicity of the AM/DMDAAC copolymer were 45.66%, 4.92 dL/g and 11.30%, respectively. Compound initiators consisting of MnCI2/NaHSO3 and ammonium persulphate could be used to improve the yield, intrinsic viscosity and cationicity of the AM/DMDAAC copolymer.