Abstract

Quaternary ammonium random copolymers poly(methacryloyloxyethyl trimethyl ammonium chloride-co-acrylamide) P(DMC-AM) with either varied cationicities or intrinsic viscosities were synthesized and their structure was analyzed by FTIR and NMR; the results verified the structure of the P(DMC-AM). The rheological behavior of the P(DMC-AM) resulting from its polymer structure (cationicity and intrinsic viscosity) in NaCl aqueous solutions was studied. The results showed that increasing the polymer cationicity could enhance its salt resistance, especially at low cationicity, and the apparent viscosity was in direct proportion to the intrinsic viscosity of the P(DMC-AM) in salt solutions. Furthermore, salt effects (ionic radius, cationic valence, and anion valence) on the apparent viscosity were characterized. They clearly showed that the apparent viscosity was decreased with the increase of ion radius and ion valence. In particular, a difference in polymer aggregation was found when multivalent cations or anions containing solvents were added; two schematic models describing the rheological behavior of the P(DMC-AM) molecules in multivalent salt solutions are proposed.

摘要

合成了具有不同阳离子度或固有粘度的季铵盐无规共聚物聚（甲基丙烯酰氧基乙基三甲基氯化铵-共-丙烯酰胺）P（DMC-AM），并通过FTIR和NMR分析了其结构；结果证实了P（DMC-AM）的结构。研究了P（DMC-AM）在NaCl水溶液中的聚合物结构（阳离子性和特性粘度）的流变行为。结果表明，提高聚合物的阳离子性可以增强其耐盐性，特别是在低阳离子度下，其表观粘度与P（DMC-AM）在盐溶液中的特性粘度成正比。此外，还表征了盐对表观粘度的影响（离子半径，阳离子化合价和阴离子化合价）。他们清楚地表明，表观粘度随离子半径和离子价的增加而降低。特别地，当添加多价阳离子或含溶剂的阴离子时，发现聚合物的聚集存在差异。提出了两个描述P（DMC-AM）分子在多价盐溶液中的流变行为的示意图。