关键词:

聚丙烯酰胺, 阳离子型聚丙烯酰胺, 双水相, 相分离

Abstract:

Phase separation is the foundation of aqueous two-phase polymerization.The polymerization process cannot proceed normally without phase separation.Phase separation is regarded as the result of superposition of various factors.Ammonium sulfate (AS) concentration is one of these factors and increasing AS concentration is obviously beneficial to phase separation.If the change of some other factor can reduce the amount of AS needed to achieve phase separation, this change is in favor of phase separation.In this paper, the amount of AS for phase separation was used as the standard to evaluate the effects of various factors on phase separation, and the lower AS amount the better.The amounts of AS for phase separation of AS-water-polyacrylamide (PAM), AS-water-CPAM aqueous two-phase systems were measured.The experiment results showed that adding some special material (such as liquid paraffin, cyclehexane, n-hexane, or t-butanol, PEG200 in the case of plentiful existence of monomer), lowering temperature, and increasing PAM concentration were beneficial to phase separation.But plentiful existence of monomer could significantly decrease polarity of AS solution, which was the most important factor affecting phase separation.

Key words:

聚丙烯酰胺, 阳离子型聚丙烯酰胺, 双水相, 相分离