Acrylamide terpolymers viscosity

Fig 1. Viscosity ratio, with/without added salt as a function of added salt. 0 is a copolymer of acrylamide and sodium styrene sulfonate (5%), a polyelectrolyte control. H is a copolymer of acrylamide and SPE, a zwitterionic polymer. is a copolymer of acrylamide and. Cg-alkyl acryl unide, a hydrophobe containing polymer. Q is a terpolymer of acylamide, Cs-alkyl acylamide and SPE, a polymer containing both hydrophobic and zwitterionic groups. 

Also, when a terpolymer that consists of vinyl pyrrolidone, styrene that is -substituted with 9,10-diphenyl anthracene, and a flluorescein derivative of acrylamide, is irradiated with light, there is a viscosity increase... 

Our group has examined copolymers and terpolymers from the hydrolytically resistant comonomers 1 Ij and 2 in which the cation and anion are evenly spaced from the macromolecular Imckbone (Scheme 2) 26-30). At equimolar incorporation of the monomers into the copolymer, a minimum in the apparent viscosity in water and a maximum in apparent viscosity in 0.514 MNaCl was observed - consistent with the so-called antipolyelectrolyte effect Simile effects are observed when acrylamide (3) is incorporated as a termonomer. A three-fold enhancement in viscosity was observed at a molar ratio of 11 13 76 for monomers (la 2 2) in 0.5 MNaCl as compared to deionized water (29). 

The viscosity-concentration profile of some of the copolymers of 4 is shown in Fig. 7.1 along with that of 6. Shown is also a terpolymer of acrylamide 4 and AMPS. Figure 7.1 illustrates the rather dramatic differences with the laurylacrylamide copolymers and with the homopolymer. 

---