AIBA·2HCl-NaHSO_3引发下DMDAAC-AM共聚物的合成与表征

Copolymerization of dimethyl diallyl ammonium chloride and acrylamide by using AIBA·2HCl-NaHSO_3 initiator and characterization

采用偶氮二异丁脒二盐酸盐(AIBA·2HCl)和NaHSO3(RH)组成的引发体系,研究了引发剂浓度、溶液的pH值、引发剂复配和加料方式等因素对二甲基二烯丙基氯化铵(DMDAAC)-丙烯酰胺(AM)共聚合反应规律的影响.结果表明:在30℃、nAM∶nDMDAAC=4∶1、ω(monomer)=30%和引发剂AIBA·2HCl-RH的浓度为1·0×10-4mol·L-1的条件下,pH=7·0时,DMDAAC-AM共聚物的特性黏数达11·56dl·g-1;pH=10·0时,特性黏数最高达13·60dl·g-1.采取连续加料方式,可获得阳离子度38·8%,特性黏数达11·61dl·g-1的共聚物.进一步测得该引发体系30℃下,聚合反应的表观活化能为33·25kJ·mol-1,单体的竞聚率为γAM=6·800,γDMDAAC=0·174.

By using AIBA · 2HCl-NaHSO3 initiation system, a series of high intrinsic viscosity copolymers of dimethyl diallyl ammonium chloride （DMDAAC） and acrylamide （AM） were prepared in aqueous medium under different conditions. The effects of various factors such as initiator concentration, pH of solution, composite initiator and the way of feeding AM etc. on the copolymerization of dimethyl diallyl ammonium chloride and acrylamide were studied. The results indicated that copolymerization could be initiated at a low temperature. At 30℃, hAM ： nDMDAAC=4 ： 1, ω（monomer） ：30%, c（AIBA·2HC1） = 1.0 × 10^-4 mol · L^-1 , when the monomer solution was polymerized at pH： 7.0, the intrinsic viscosity of PDMDAAC-AM was 11.56 dl · g^-1 when the monomer solution was polymerized at pH： 10.0, the intrinsic viscosity of copolymer was up to 13.60 dl · g^-1. If continuous feeding of AM was used , the cationicity and intrinsic viscosity of copolymer could attain 38.8% and 11.61 dl · g^-1. Furthermore, the monomer reactivity ratios and apparent activation energy of the polymerization system were determined.At 30 ℃, initiated by AIBA · 2HCl-NaHSO3 initiator, the reactivity ratios of DMDAAC and AM were 0. 174 and 6. 800, respectively, and the apparent activation energy was 33.25 kJ · mol^-1.