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100
multiple entities
The word ‘polymer’ meant for material made from?
100
addition polymers
polymer in which self addition of unsaturated monomers occurs to give a polymer without the elimination of any byproduct?
100
hevea brasiliensis
The natural rubber is mostly obtained from?
100
poly chloroprene.
Neoprene is chemically known as?
100
cellulose
The constituent of most natural fibers?
200
high mechanical strength
the Best characteristic property of polymer material?
200
Phenol and Formaldehyde
Name the monomer units of Bakelite?
200
because it has high strength and good chemical resistance
Why synthetic adhesives have more advantage over natural adhesives?
200
SBR
Buna-s is also known as?
200
Perspex
Polymethyl methacrylate (PMMA) is known as?
300
Thermosets
strongest polymer group is?
300
It can’t be reshaped again and again by applying heat.
Why is Bakelite a thermosetting polymer?
300
non-polar solvents
Benzene, Toulene and petrol are chemically resistance to which type of solvents?
300
cellulose acetate
Automobile steering wheels are normally made of?
300
condensation polymerization
Amino acids react to form peptides and proteins, this process is known as?
400
slight adjust of molecular chain
Elastic deformation in polymers is due to?
400
Glass transition temperature
Name the temperature at which the amorphous solid state is transformed to the metal state?
400
its softening
Mastification of rubber means?
400
manufacture of synthetic rubber.
The main use of butadiene is?
400
2-methyl 1,3-butadiene
The monomer of neoprene is?
500
aramid fibers
Kevlar is commercial name for?
500
methyl metharcylate
Name the monomer of polymethyle methacrylate (plexi glass/PMMA)
500
Teflon/Dacron
The tubes which are good substitute for human blood vessels on heart by-pass operation?
500
expanded polystyrene
Lavatory cisterns are normally made of?
500
Terylene
The most commonly used polyester is?