51. Most of the plastics are safe to be used upto a maximum temperature of __________ °C.
52. __________ is a homopolymer.
53. Plastic tubes & pipes are generally made by __________ moulding.
54. Condensation polymerisation is not involved in the manufacture of
55. Glyptal used in the manufacture of paints & lacquers is a __________ polymer.
56. Addition of stabiliser during PVC manufacture is done to
57. Which of the following is not a polyolefin ?
58. Flexible foam (for mattresses) are usually made of
59. __________ fibres are made of polyamides.
60. Temperature maintained in the emulsion polymerisation reactor for PVC manufacture is about __________ ° C.
61. Which of the following is stretched into fibres ?
62. Antioxidants are added to rubber to protect it from the attack of light, heat & atmospheric ozone. Which of the following is an antioxident used in rubber ?
63. Maximum consumption of polymers is in
64. Low density polythene as compared to high density polythene is
65. Polymethyl methacrylate, which is an acrylic resin, is also called
66. Condensation polymerisation of formaldehyde with __________ does not produce phenolic resin.
67. Neoprene is rendered non-inflammable, because of
68. Low pressure Zeigler process for the manufacture of polythene uses a catalyst which is
69. Phosphates (e.g., triceresyl, tributyl, tetrabutyl, tripheyl etc.) are added to polymers to act as
70. __________ polymer is produced by the copolymerisation of vinyl chloride-vinyl acetate.
71. Which of the following is a natural polyamide fibre.
72. __________ is a copolymer.
73. Polycaprolactum is nothing but
74. Cellulose acetate has very high film permeability among all the polymers of the order of 5000 gm/100 m2. Which of the following polymers has the maximum film elongation (of the order of 100%) ?