By D. R. Bassett, K. L. Hoy (auth.), Robert M. Fitch (eds.)
This quantity is created from lots of the papers awarded at a symposium held in Miami seashore throughout the nationwide assembly of the yank Chemical Society in September, 1978. In a feeling, it's a sequel to the 1st ACS symposium hung on this subject and released less than the identify "Polymer Colloids" in 1971 by means of Plenum Press. That quantity contained 12 papers, while "Polymer Colloids II" includes 33, a sign of the value of the expansion of the sector in under a decade. elevated sophistication most likely top characterizes the alterations that have taken position, in particular within the realm of instru mentation. Ten years in the past strategies akin to quasielastic mild scattering, X-ray photoelectron spectroscopy (XPS - sometimes called ESCA), ion scattering spectroscopy (ISS), ultrasonic absorption spectroscopy and hydrodynamic exclusion chromatography (REC) have been unavailable to the polymer colloid chemist. contemporary advances in all of those tools are defined during this quantity. even though the booklet bargains basically with "synthetic latexes" or "emulsion polymers" as colloids, there are many papers which care for their synthesis: particle nucleation in emulsion polymer ization, the synthesis of emulsifier-free polymer colloids utilizing novel reagents, molecular weight distributions derived from the kinetics of emulsion polymerization, and anionically polymerized non-aqueous polymer colloids. The kinetics and thermodynamics of the swelling of latex debris through monomers can be handled here.
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Extra info for Polymer Colloids II
A. Hopper for help with the experimental system, to Mr. L. Marks for theoretical advise and to Dr. T. Martin for PES measurements. REFERENCES 1. 2. 3. 4. M. Bier (ed), Electrophoresis: Theory, Methods and Applications, Academic Press, New York (1967). D. J. Shaw, Electrophoresis, Academic Press, New York (1969). B. W. Watrasiewicz and M. J. Rudd, Laser Doppler Measurements, Butterworths, London (1975). B. R. Ware and W. H. Flygare, Chern. Phys. , 12, 81 (1971); B. R. Ware, Adv. , ~, 1 (1974). so V.
For smaller particles where the Rayleigh-Gans-Debye approximation is valid, the angular scattering patterns become less sensitive to particle parameters making it difficult to obtain a reliable fit. The same general considerations applied to concentric spherical particles so that it was necessary to use the exact treatment. The RGD approach was useful mainly in investigating general trends, rough-checking and debugging during computer program development. Exact Computations The initial derivation by Aden and Kerker 2 for the angular dependence of the light scattered from coated spherical particles has been reviewed and updated by Kerker.
A polystyrene latex of approximately the same particle size was treated in a similar fashion. In both cases a slight contraction, amounting to approximately 50 A, was observed at pH's greater than 9 due to the electrolyte effect of the sodium hydroxide. CARBOXYLIC EMULSION POLYMERS 23 CORE SEOIMENTATION A • STO ACRYLIC LA TEX. IO/o' . -~--~-~--~----"'-"--'" pH Fig. 12. Sedimentation behavior as a function of pH for latexes containing no polymerized carboxylic acid. Maximum decrease in size calculated using Equation 8.
Polymer Colloids II by D. R. Bassett, K. L. Hoy (auth.), Robert M. Fitch (eds.)