Emulsion polymerization

presentation of Emulsion polymerization

1. Emulsion Polymerization Mohammad Shahidul Department of Textile Engineering ID: BTE 00905507

2. Emulsion Polymerization The most common type of  emulsion polymerization  is an oil-in-water  emulsion , in which droplets of monomer (the oil) are emulsified (with surfactants) in a continuous phase of water. Water-soluble polymers, such as certain polyvinyl alcohols or hydroxyethyl celluloses, can also be used to act as emulsifiers/stabilizers.

3. Emulsion Polymerization : Typical ingredient 100 part (by wt.) monomer (water insoluble) 180 part water 2-5 parts acid soap 0.1-0.5 part water-soluble initiator 0-1 part CTA (monomer soluble)

4. growing polymer particle Monomers inside the micelle decrease Unreacted monomers in other micelles and in droplets diffuse through water to the growing particles Reaction terminates when 2 nd radical gets in reaction starts again for the 2 nd chain when 3 rd particle gets in. Steps in Emulsion Polymeriztion Water-soluble initiator Polymer born in water Monomer swollen micelle Polymer moves to micelle

5. Applications Polymers produced by emulsion polymerization can be divided into three rough categories. Synthetic rubber Some grades of   styrene-butadiene   (SBR) Some grades of   Polybutadiene Polychloroprene   ( Neoprene ) Nitrile rubber Acrylic rubber Fluoroelastomer   ( FKM ) Plastics Some grades of   PVC Some grades of   polystyrene Some grades of   PMMA Acrylonitrile-butadiene-styrene terpolymer (ABS) Polyvinylidene fluoride Polyvinyl fluoride PTFE