Polymer Technology

61. Commercial production of polypropylene employs _________ polymerisation.

1. Emulsion
2. Suspension
3. Solution
4. Bulk

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62. Condensation of bisphenol A with phosgene produces _________ which possess very good heat resistance.

1. Polyurethane
2. Polysulfone
3. Polycarbonate
4. Polyester

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63. Condensation polymerisation is not involved in the manufacture of

1. Teflon
2. Polythene
3. Terylene
4. Nylon

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64. Condensation polymerisation of _________ produces Bakelite.

1. Propylene
2. Phenol & formaldehyde
3. Phenol & acetaldehyde
4. Urea & formaldehyde

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65. Condensation polymerisation of caprolactam is carried out in the reactor maintained at a temperature of _________ °C for producing nylon-6.

1. -20 to 25
2. 50 to 75
3. 100 to 150
4. 250-280

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66. Condensation polymerisation of formaldehyde with _________ does not produce phenolic resin.

1. Resorcinol
2. Phenol
3. Para-cresol
4. Melamine

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67. Contact lenses for eyes are made of Perspex, which is nothing but

1. poly-methyl-methacrylate
2. Polystyrene
3. Unsaturated polyester
4. Polypropylene

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68. Cross linked polymers are

1. Thermoplastic
2. Thermosetting
3. Either (A) or (B)
4. Fibres only

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69. Cross linked polymers formed from bi-and trifunctional groups in which cross-linkage in three dimensions via few chemical bonding across linear chains occur imparts to the polymer _________ properties.

1. Thermoplastic
2. Thermosetting
3. Elastometric
4. Brittleness

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70. Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding

1. Glycerol
2. Nitro cellulose
3. Camphor
4. None of these

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