Abstract
Polystyrene (PST) latex dispersions have been prepared by dispersion polymerisation in solutions of polyacrylic acid (PAA) and polymethacrylic acid (PMA) in alcohol/water mixtures. Analysis of the latices by potentiometric titration indicates that they are stabilised by poly(meth/acrylic acid-g-styrene) graft copolymers formed in-situ and containing 10–20% w/w styrene as oligomeric chains. The flocculation behaviour of the latices on addition of HCl and NaCl has been studied as a function of particle concentration, degree of neutralisation and temperature. Whereas in the case of PAA the flocculation behaviour of the latices showed little correspondence with the phase-separation behaviour of PAA solutions, the flocculation behaviour of latices prepared using PMA was broadly similar to the phase-separation behaviour of PMA solutions. The results have been explained in terms of the chemical modifications which the polyacids are likely to undergo during dispersion polymerisation.
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