Macromer Stabilised Polystyrene Latexes

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Presentation transcript:

Macromer Stabilised Polystyrene Latexes Paul M. Zelisko CHEM 765

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, 5673-5682 Colloid Polym Sci. 1997, 275, 716-729 J Polym Sci: Part A: Polym Chem. 1993, 31, 2473 - 2479

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

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, 5673-5682 J Colloid Interface Sci. 1990, 137, 120

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

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

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

THIOL-ENDED POLY(ETHYLENE OXIDE) styrene added to stabiliser under radical polymerisation conditions Colloid Polym Sci, 1997, 275, 716-729

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

POLY(ETHYLENE GLYCOL)-ISOCYANATE Macromolecules, 2000, 33, 6664-6671

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

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

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