Discussion
Match each polymerisation technique with its characteristic feature.
List I
A. Bulk
B. Solution
C. Suspension
D. Emulsion
List II
1. monomer droplets in water giving beads
2. monomer alone, with difficult heat removal
3. a surfactant gives a latex of very fine particles
4. a solvent controls viscosity but must be removed
Answer: B
Correct answer: A-2, B-4, C-1, D-3
Four techniques distinguished by what surrounds the monomer. Bulk polymerisation uses monomer alone, so the product is pure but the heat of reaction is very hard to remove from a thickening mass. Solution adds a solvent that controls the viscosity and carries the heat away, at the cost of removing it afterwards. Suspension disperses monomer droplets in water, each acting as a small bulk reactor and giving beads. Emulsion uses a surfactant to give a latex of very fine particles, with excellent heat transfer and high rate together.
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