Chapter 2: Thermoplastic Material - POLYSTYRENE

Identify chemical structure for Polystyrene

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Polystyrene form polymerization by.....?

• Evaporation

• Chemical Reaction

• Addition

• Condensation

The very large aromatic ring prevents polymer from.............and increase.............by steric effect

• crystallization; flexibility

• crystallization; tensile strength

• broken; flexibility

• broken; tensile strength

PS burn readily with yellow flames and dark, sooty smoke as effect from?

• Burning of oxygen

• Aromatic pendant group

• Carbon carbon double bond

PS suitable for application of..........term effect.

• long

• short

Polystyrene foam have .............. performance compare to other competitive material

• low

• good

• superior

• excellent

Advantages of Polystyrene foam are:

• Low thermal conductivity

• Good insulation

• High bouyancy

• Low cost

Identify catalyst hold monomer and polymer chain in specific geometrical configuration during polymerization are called?

• Octatallocenes

• Metallocenes

• Pentallocenes

• Ethtallocenes