DADMAC／AM／AA反相微乳液聚合体系的稳定性

以非离子表面活性剂失水山梨醇单油酸酯(Span80)和聚氧乙烯失水山梨醇单硬酯酸酯(Tween60)为复配乳化体系,环己烷为油相,二甲基二烯丙基氯化铵(DADMAC)、丙烯酰胺(AM)、丙烯酸(AA)为乳化单体,采用电导法和目测法研究了单体质量分数、单体配比、亲水-亲油平衡值(HLB)、乳化剂加入量和电解质对反相微乳液稳定性的影响。结果表明,单体质量分数在50%~65%可以形成稳定的反相微乳液体系;固定单体质量分数时,随着单体配比中丙烯酰胺量的增大,微乳液体系稳定性得到不断增强;HLB值在5.36~8.54时体系较稳定,HLB值在7.48时微乳液体系最稳定;乳化剂的用量越大,所形成的反相微乳液体系越稳定;加入具有盐析效应的电解质时,反相微乳液聚合体系的微粒进一步细化,稳定性进一步增强。

The Stability of Reverse Microemulsion Polymerization System Based on DADMAC/AM/AA

Taking cyclohexane as the oil phase,DADMAC,AM and AA as the monomers, based on the emulsifying system comprised of nonionic surfactants Span80 and Tween60,effects of monomer concentration,monomer fraction,hydrophile-lipophile balance(HLB) value,the dosage of emulsifier as well as electrolytes on the stability of inverse microemulsion were studied by method of conductometry and eyeballing.The experimental results show that stable inverse microemulsion system can be formed with the mass fraction monomer in the range of 50% to 65%,the stability of inverse microemulsion continuously increases with the increase of acrylamide based on the fixed mass fraction of the monomers.It is also found that the system with HLB value in the range of 5.36 to 8.54 is stable and is most sable with the HLB value of 7.48,the inverse microemulsion sisytem is more stable when used more emulsifier,additionally,introduction of electrolytes into the system can make particles further fine and enhance stabilization performance.