A. Impart flexibility
B. Improve workability during fabrication
C. Develop new improved properties not present in the original resin
D. All A., B. and C.
Related Mcqs:
- 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 - Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its__________________?
A. Tensile strength
B. Chemical resistance
C. Flexibility
D. All A., B. & C. - Molecular weights of plastics ranges from_______________?
A. 1000 to 5000
B. 5000 to 1000
C. 20000 to 25000
D. 109 to 1011 - _____________ moulding is used for shaping of thermosetting plastics exclusively?
A. Compression
B. Injection
C. Transfer
D. Extrusion - Visco-elastic behaviour exhibited by plastics is a ______________ like behaviour?
A. Solid
B. Liquid
C. Combination of solid & liquid
D. Neither solid nor liquid - Most of the plastics are safe to be used upto a maximum temperature of ______________ °C?
A. 100
B. 150
C. 350
D. 450 - The synthetic fibres produced from _____________ are known as rayon?
A. Lignin
B. Cellulose
C. Polyamides
D. Ethylene glycol - Synthetic polymer produced by using terephthalic acid and ethylene glycol is _________________?
A. Terylene
B. Nylon-66
C. PVC
D. Polystyrene - Which of the following is generally not used as eord for synthetic rubber tyre casing ?
A. Dacron
B. Nylon
C. Cellulose
D. None of these - Synthetic rubber___________________?
A. Deforms, if stretched to double of its original dimension
B. Is brittle at low temperature
C. Is softer at higher temperature
D. Is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases
