51. Plasticisers are high boiling liquids added to plastic polymers to impart toughness and flexibility at ordinary temperature. Which of the following is not a plasticiser?
52. Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding
53. Nylon-66 compared to nylon-6 has
54. Which of the following is not a natural fibre?
55. __________ tubes are good substitude for human blood vessels onrheart by-pass operation.
56. Polycaprolactum is also known as
57. Which of the following low molecular weight (< 104), soft & waxy polymer is used in chewing gum?
58. Polypropylene is preferred to polythene, because the former is
59. Polycaprolactum (Nylon - 6) is produced by the condensation polymerisation of caprolactum at 240-280°C in which the conversion of caprolactum is about __________ percent.
60. Unbreakable crockeries are made from __________ polymers.
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