31. Temperature and gage pressure maintained during the manufacture of hot SBR (styrene butediene rubber) are
32. Reaction of dimethyl terephthalate (DMT) and ethylene glycol produces
33. Polystyrene is a __________ plastic at room temperature.
34. __________ is a thermosetting plastic.
35. Condensation polymerisation of caprolac-tum is carried out in the reactor maintained at a temperature of __________ °C for producing nylon-6.
36. __________ is an addition polymer
37. The synthetic fibres produced from __________ are known as rayon.
38. __________ is a natural fibre.
39. Plasticisers are added to synthetic plastics to
40. Plexiglass (also called lucite) because of its high optical transparency is used for making lenses. It is chemically
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