Acrylic latex photon correlation

Figure 2. Effect of equilibration time on carboxylic particle expansion at pH = 12.5 as determined by photon correlation spectroscopy. The confidence interval on d is at the 90% probability level. The initial particle size is given by d0 (acrylic latex, 2% AA(ll), d0 = 1120 A).

Figure 5 shows the swelling behavior of the model acrylic latexes as determined by photon correlation spectroscopy. Changes in particle diameter are shown instead of radius as in Figures 3 and 4. The diameter, d, at each pH was divided by the initial diameter, d0, determined at pH = 5 (unexpanded). In general shape, the curves are similar to those determined by sedimentation and viscometry. The initial points occurred at a higher pH due to the much lower particle concentration. No effort was made to lower the initial pH with acid consequently, the undesirable salt effect was avoided. 

Figure 7. Expansion characteristics of PMMA latex containing 3% acrylic acid (Stage II) as determined by photon correlation spectroscopy...

Figure 8. Effect of added electrolyte (0.01M NaCl) on the expansion characteristics of a model carboxylic latex as determined by photon correlation spectroscopy (( ) acrylic latex, 2% AA(II), d = 1120 A same latex in 0.01 M NaCl, d0 =...

Wide angle light scattering is used as the principal probe to examine the core-shell structure proposed for certain acrylic acid acrylate ester copolymer latexes. Additional techniques were sedimentation and photon correlation spectroscopy. 

---