Polymer Technology

221. The starting material used for the manufacture of caprolactam is

1. Ethyl benzene
2. Cyclohexane
3. Ethylene glycol
4. DMT

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222. The synthetic fibres produced from _________ are known as rayon.

1. Lignin
2. Cellulose
3. Polyamides
4. Ethylene glycol

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223. Thermal pyrolysis of ethylene dichloride produces

1. Trichloroethylene
2. Vinyl chloride
3. Ethanol amine
4. Ethylene oxide

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224. Thermocol (expanded polystyrene) is not used for

1. Low temperature thermal insulation as in refrigerator and air conditioners
2. Acoustic control and ceiling for building
3. High temperature thermal insulation in furnaces
4. Packing of delicate electronic gadgets

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225. Thermocol is a spongy, porous, rigid or flexible foamed plastic, obtained by blowing gas/air through molten

1. Saturated polyester
2. Polyurethane
3. Polystyrene
4. Either (B) or (C)

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226. Thermoplastic materials

1. Do not soften on application of heat
2. Are heavily branched molecules
3. Are solvent insoluble
4. None of these

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227. Thermoplastic resins usually

1. Remain hard as long as they are hot
2. Cannot be reclaimed from waste
3. Permanent setting resins
4. Less brittle than thermosetting resins

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228. Thermosetting materials

1. Are cross-linked molecules
2. Soften on application of heat
3. Are solvent soluble
4. None of these

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229. Thermosetting plastic materials

1. Can be repeatedly melted
2. Is useful for melt casting
3. Cannot be melted after forming
4. Is useful for spinning

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230. Thermosetting polymers as compared to thermoplastic polymers

1. Are formed by addition polymerisation
2. Have three dimensional structure
3. Have linear structure
4. None of these

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