51. Polyurathane can not be used to make
52. 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%)?
53. Flexible foam (for mattresses) are usually made of
54. Bakelite is
55. Bakelite is a/an
56. Thermocole is a spongy, porous, rigid or flexible foamed plastic, obtained by blowing gas/air through molten
57. Buna-S is also called
58. In case of wet spinning of polymers, the polymer solution is forced through spinnerates into, a coagulating bath to give a filament form. Wet spinning is not used in case of the __________ fibres.
59. __________ is a homopolymer.
60. Melt spinning of polymers involves the forcing of polymer melt through spinnerettes (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the __________ fibres.
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