Which one is not an example of addition Polymerization 1. bulk Polymerization 2. Solution Polymerization 3. Colloidal Polymerization 4. Suspension Polymerization
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Answer:
Suspension Polymerization
Suspension polymerization is used to make a number of thermoplastic polymers. In suspension polymerization, all reactions are carried out in relatively large droplets or in polymer particles stabilized by a small amount of water-soluble gum. Organic peroxide initiators are used to generate radicals within the droplets. A solvent may be used to dissolve a monomer at a relatively high concentration. The main advantages of suspension polymerization over emulsion systems are that no surfactants, which are difficult to remove from the product, are used, and no ionic end groups are present, which may be unstable during processing at high temperatures. What follows is a general introduction to suspension polymerization.