Density of low density polythene is about ____________ gm/c.c?
A. 0.38
B. 0.56
C. 0.81
D. 0.91
Polymer Technology
Condensation polymerisation of caprolactam is carried out in the reactor maintained at a temperature of __________ °C for producing nylon-6?
Condensation polymerisation of caprolactam is carried out in the reactor maintained at a temperature of __________ °C for producing nylon-6?
A. -20 to 25
B. 50 to 75
C. 100 to 150
D. 250-280
Scouring is a finishing operation during the manufacture of fibre, which aims at ______________ of fibres?
Scouring is a finishing operation during the manufacture of fibre, which aims at ______________ of fibres?
A. Improving the stretchability
B. Dyeing/colouring
C. Detergent solution washing
D. Glycol soaking
In condensation polymerisation as compared to addition polymerisation____________________?
In condensation polymerisation as compared to addition polymerisation____________________?
A. The monomers are unsaturated compounds
B. No co-product is lost
C. The monomers contain two functional groups
D. Generally only one monomer is involved
Polyvinyl acetate is never used for making_________________?
Polyvinyl acetate is never used for making_________________?
A. Moulded articles
B. Fibres
C. Adhesives
D. All A., B. & C.
Thermosetting resins/polymers as compared to thermoplastic ones are ____________________?
Thermosetting resins/polymers as compared to thermoplastic ones are ____________________?
A. Soluble in all organic solvents
B. More brittle
C. Formed by addition polymerisation only
D. Easily reshaped & reused
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?
In case of wet sning of polymers, the polymer solution is forced through snerates into, a coagulating bath to give a filament form. Wet sning is not used in case of the _____________ fibres?
A. Viscose rayon
B. Acrylic
C. Polyvinyl acetate
D. Saturated polyester
Melamine formaldehyde resin which has a very high anti tacking properties, is not used for the ___________________?
Melamine formaldehyde resin which has a very high anti tacking properties, is not used for the ___________________?
A. Electrical insulation purpose
B. Tanning of leather
C. Strengthening of plaster of Paris
D. Decorative laminates
Thermal pyrolysis of ethylene dichloride produces ____________________?
Thermal pyrolysis of ethylene dichloride produces ____________________?
A. Trichloroethylene
B. Vinyl chloride
C. Ethanol amine
D. Ethylene oxide
In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher ___________________?
In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher ___________________?
A. Densities
B. Melting point
C. Tensile strength
D. Hardness, rigidity & brittleness