Preparation of polymethylmethacrylate latices in non-polar media

Abstract

Abstract:The dispersion polymerization of methylmethacrylate stabilized by poly(12-hydroxy-stearic acid) in hydrocarbon media has been investigated. Unlike earlier results [7] it was found that stable latex particles can be prepared in the initial monomer concentration range 8.5 % to 34 %'. To obtain stable particles varying amounts of stabilizer were used.

Dispersion polymerization in non-polar solvent: Evolution toward emerging applications

“…Although the original report was found in the patent literature, the work by Antl et al [38] has been taken as reference in most of the academic publications. [39,41,42,57,58] Using this approach, PHSA homopolymer ( Figure 6) was firstly prepared by polycondensation of 12-hydroxy stearic acid in toluene, usually in the presence of a sulphonic acid catalyst, such as methane sulfonic acid. To achieve sufficient conversion and avoid hydrolysis (i.e.…”

“…The polymerization is thermically initiated (80°C) and kept under an inert atmosphere at all times, following the procedure of Antl et al [38] and subsequent research reports. [39,41,42,58] Cairns et al [57] also reported a seeded polymerization which involves the early formation of seeded latex and a subsequent slow continuous introduction of a feed solution. After the latex formation is complete (typically 2 hours), and in order to prevent possible desorption of stabilizer from the latex particle surface, the PHSA-g-PMMA-PGMA copolymer is chemically reacted to the particle surface (second step).…”

“…However, this relatively high temperature can lead to the formation of coagulum in the dispersion medium if not carefully controlled. [40] A final purification step through centrifugation [38] or natural sedimentation cycles [58] is generally done.…”

“…Several reports [38,57,58] Barrett et al [56] investigated the MMA free radical dispersion polymerization in dodecane stabilized by PHSAg-PMMA copolymers and initiated with azobisisobutyronitrile (AIBN). They estimated the effect of changing different reaction parameters on the rate of polymerization.…”

Preparation of Monodisperse, Fluorescent PMMA–Latex Colloids by Dispersion Polymerization

“…The preparation of homogeneous fluorescent latex particles as described in this section was done analogous to the methods described in (10,19,20). For the synthesis a standard reflux setup was built.…”