The apparent viscosity of poly(acryloyloxyethyltrimethyl ammonium chloride-acrylamide) with serial molecular weights in the aqueous salt solutions

Abstract

In order to study the relationship between the structure and solution property of poly(acryloyloxyethyltrimethyl ammonium chloride-acrylamide)(P(DAC-AM)), the P(DAC-AM) with cationicity of 50% and serial molecular weights were synthesized by aqueous solution polymerization, and characterized by gel permeation chromatography (GPC). Then the effects of inorganic salts on the apparent viscosity (η_a) of P(DAC-AM) were investigated. The results showed that the value of η_a increased with the increase of the molecular weight when the molecular weights of P(DAC-AM) synthesized were 1.67 × 10⁶, 2.16 × 10⁶ and 2.90 × 10⁶ g/mol. The η_a firstly decreased to the inflection point, then remained the value or increased with the increase of the salt concentration. It was discovered that the multivalent salt ions had a great effect on the η_a due to the larger number of counter ions and the larger volume of the complex formed by themselves. Furthermore, the effect of anions on the η_a of P(DAC-AM) was larger than that of cations. The above researches laid a foundation for the further study of the relationship among the structure, property and performance of P(DAC-AM) with serial cationicity.

Graphical Abstract

Keywords:

• Molecular weight
• poly(acryloyloxyethyltrimethyl ammonium chloride-acrylamide)
• synthesis
• solution property
• inorganic salt