The colloidal stability of random (P[SBMA]) and core-and-
The latexes were exposed to toluene, chloroform, and other solvents shell (PS/PBMA) copolymer latexes of styrene and butyl metacryvapors within a closed desicator at room temperature. Aliquots of 0.5 ml late is modified, after exposure to toluene, chloroform, benzene, of the latex were used within ca. 18-mm diameter cups, to avoid the effects and heptane vapors. This effect is observed using turbidimetric of slow diffusion throughout the dispersion. After the given times (see latex titration with NaCl, as well as observing latex settling after Figs. 1 and2) aliquots of the solvent-swollen latexes were withdrawn and 48 h exposure to NaCl. We propose that this may be due to one turbidimetrically titrated ( 14) with NaCl solution. Toluene concentration or both of the following factors: (i) a change in the Deborah within the P[SBMA] latex particles was determined using isopycnic density number, which is in turn due to a change in the viscoelastic propermeasurements. The concentration thus obtained is 1.4% (for a latex exposed ties of one or more particle domains, induced by apolar solvent to toluene vapor for 24 h), which corresponds to a latex diameter change sorption; (ii) a change in the extension of charged polymer chainof 0.4 nm, only. The random copolymer latex is strongly stabilized by toluene and chloroform (Fig. 1), as well as by heptane and benzene (data ends (polymer hairs), toward the aqueous phase. ᭧ 1996 Academic not shown).