1. Macromer Stabilised Polystyrene Latexes
Paul M. Zelisko
CHEM 765

2. Dispersion Polymerisation
can be used to produce narrow dispersed polymer microparticles
latexes used in paints, liquid chromatography, adhesives
monomer
initiator
stabiliser
H2O/
ROH
polymer
Macromolecules. 1997, 30,
Colloid Polym Sci , 275,
J Polym Sci: Part A: Polym Chem , 31,

3. Stabilising Colloids electrostatic stabilisation steric stabilisation
adsorption
grafting
macromers
polymers with a functionalised terminus for physical adsorption at the interface or for grafting to the polymer colloid

4. POLY(STYRENE-b-DIMETHYLSILOXANE)
used to stabilise dispersion polymersiation of styrene in CO2
no chain transfer to silicone, even under radical conditions
Macromolecules. 1997, 30,
J Colloid Interface Sci , 137, 120

5. POLY(STYRENE-b-DIMETHYLSILOXANE)
Advantages
lowered cost
straightforward anionic synthesis
narrow molecular weight distributions
soluble in many organic solvents
Disadvantage
stabilisation by adsorption to polymer

6. METHYLMETHACRYLATE-POLY(ETHYLENE OXIDE)
used in radical dispersion polymerisation of styrene
can get grafting through terminal group
chemical bond between stabiliser and polymer

7. METHYLMETHACRYLATE-POLY(ETHYLENE OXIDE)
need PEO chains on macromer that are at least 2000 MW to inhibit flocculation
synthesis of macromer becomes inefficient as PEO reaches limits of effective stability
Colloids and Surfaces, 1986, 17, 1-11

8. THIOL-ENDED POLY(ETHYLENE OXIDE)
styrene added to stabiliser under radical polymerisation conditions
Colloid Polym Sci, 1997, 275,

9. THIOL-ENDED POLY(ETHYLENE OXIDE)
maximum 15% of stabiliser grafted to colloid
remainder in aqeuous phase

10. POLY(ETHYLENE GLYCOL)-ISOCYANATE
Macromolecules, 2000, 33,

11. POLY(ETHYLENE GLYCOL)-ISOCYANATE
can be used in radical and ionic polymerisations
1H-NMR showed that 100% of macromer grafts to the polystyrene
bulky urethane group
hydrolytic stability
monitor reaction using FT-IR

12. POLY(ETHYLENE GLYCOL)-ISOCYANATE
Stabiliser “shell”
Polystyrene
~7 nm

13. Conclusions develop a macromer to suit experimental goals
ideal macromer can react in ionic and/or radical polymerisation
macromers are an effective means of stabilising colloids