- A. Improve its impact strength
- B. Improve its elasticity
- C. Reduce the melt viscosity & glass transition temperature
- D. Prevent its thermal degradation
Polymer Technology
-
Addition of stabiliser during PVC manufacture is done to_____.
-
Nylon-6 is a_____.
- A. Polyamide
- B. Thermosetting resin
- C. Polyester
- D. None of these
-
Rayon is superior to cotton in making gauge for wound treatment, because rayon_____.
- A. Is a synthetic polymer
- B. Does not stick to the wound unlike cotton
- C. Can absorb over 90% of its own weight of water
- D. Both B & C
-
The generic chemical name for the class of polymers which are commerically known as nylons is_____.
- A. Polyolefins
- B. Polyamide
- C. Polyacrylate
- D. Polyurathane
-
Vulcanisation of rubber does not increase its_____.
- A. Elasticity
- B. Plasticity
- C. Ductility
- D. None of these
-
_____ are produced by reacting polybasic acid (e.g. phthalic anhydride) with polyhydric alcohol (e.g., glycerol).
- A. Unsaturated polyester
- B. Alkyd resins
- C. Saturated polyester
- D. Amino resins
-
Condensation polymerisation of _____ produces bakelite.
- A. Propylene
- B. Phenol & formaldehyde
- C. Phenol & acetaldehyde
- D. Urea & formaldehyde
-
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?
- A. Ethylene glycol
- B. Stearic acid estors
- C. Tricresyl phosphate
- D. Esters of phthalic acid
-
Softening point of high density polythene is about _____ °C.
- A. 85
- B. 135
- C. 165
- D. 205
-
Nylon-6 is manufactured from_____.
- A. Caprolactum
- B. Adipic acid and hexamethylene diamine
- C. Maleic anhydride and hexamethylene diamine
- D. Sebasic acid and hexamethylene diamine