Light scattering acrylamide copolymers

CRJ Cristiano, C.M.Z., Soldi, V., Li, C., Aimes, S.P., Rochas, C., Pignot-Paintrand, I., and Borsali, R., Thermo-responsive copolymers based on poly(A-isopropyl acrylamide) and poly[2-(methacryloyloxy)ethyl phosphotylcholine] Light scattering and microscopy experiments, Macromol. Chem. Pltys., 210, 1726, 2009. 

The acrylamide-based polymers used in the study were obtained commercially in powder form. The homopolymers designated as PS-2806, SPP-34 and ALD-18127-7 were supplied by Polysciences, Scientific Polymer Products and Aldrich respectively. Supplied also by Polysciences were our two poly(acrylamide-co-acrylic acid) samples of high and low carboxyl content, PS-2220 and PS-4652. Table I illustrates the molecular weight distribution of these samples as determined by aqueous GPC/Laser light scattering. The acrylic acid contents of PS-2220 and PS-4652 copolymers measured by 90 MHz C NMR were approximately 63% and 15% respectively. Both the GPC and the NMR analyses indicated PS-2220 contained appreciable amounts of impurities. 

Fig. 6.1. Determination of the exponent a from the slope and the constant K[ from the intersection with the y-axis when plotting log [q] as a function of log M. Values for the intrinsic viscosity [q] of the polycation poly(acrylamide-co-(A/,A/,A/-trimethyl-A/-[2-methacryloethyl]-ammoniumchloride) (PTMAC) in 0.1 mol/l NaN03 solution are taken from Fig. 4.2. The copolymer consists of 8 mol% TMAC and 92 mol% AAm. Molar mass values were determined with multi-angle laser light scattering (MALLS), data from [102]...

Figure 6.12 is an example of a molar mass distribution of a cationic copolymer floccu-lant of acrylamide measured using a SEC system coupled to a differential refractive index detector and a multi-angle light scattering detector. 

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