Polymer Technology Mid - I, September - 2014

1.PVC is
  • A thermosetting material
  • A condensation polymerization product
  • Made by employing emulsion polymerisation
  • None of these
Answer: C
2.Vulcanisation of rubber means
  • Decreases its tensile strength
  • Increases its ozone and oxygen reactivity
  • Increases its oil & solvent resistance
  • Converts its plasticity into elasticity
Answer: D
3.Thermosetting materials are
  • Cross linked polymers
  • Soften on application of heat
  • Solvent soluble
  • None of these
Answer: A
4.______ is a copolymer
  • Nylon -66
  • Polyprophylene
  • PVC
  • PTFE
Answer: A
5.The repeating units of PTFE are
  • Cl2 CH – CH3
  • F2C = CF2
  • F3C = CF3
  • Cl C =CF2
Answer: B
6.Polymers with only carbon atom in the main chain are called _________ polymers
  • Homo-chain
  • Hetero-chain
  • both
  • none
Answer: A
7.Which of the following is not a natural fibre
  • Silk
  • Rayon
  • Wool
  • Cotton
Answer: B
8.Pick the wrong statement
  • Poly styrene is a thermoplastic polymer
  • Protein is a natural polymer
  • Neoprene is a natural rubber
  • Polythene is a copolymer while SBR is a homoplymer
Answer: D
9.Poly(styrene-stat-butadiene) is an example for
  • Statistic copolymer
  • Diblock copolymer
  • Graft copolymer
  • None
Answer: A
10.Which is solvent of Polystyrene in a Polymerization process
  • Lower alcohols
  • Diethyl ether
  • Acetone
  • Methylene chloride
Answer: D
11._________________ is a reducing agents that are suitable for initiating radical polymerization by redox reactions.
Answer: N, N-dimethylaniline / Mercaptans / Benzoin
12.Amorphous polymers whose glass transition temperatures are below room temperature are called ____________________
Answer: Elastomers
13.__________________ is an example for Initiator in Polymerization process.
Answer: Benzoylperoxide
14.Ziegler –Natta catalyst is ___________________
Answer: TiCl3 + Al(C2H5)3
15.Mark-Houwink-Kuhn equation is ________________
Answer: η = K Ma
16.The molecular weight of a homopolymer is _____________________
Answer: M = P * Mru
17.__________________is an oxidizing agents that are suitable for initiating radical polymerization by redox reactions .
Answer: Peroxodisulfates / Diacyl peroxides / Hydroperoxides
18.Viscosity measurement of a polymer is the measurement of the ______________
Answer: Melt Flow Index
19.______________ is the solvent of P.V.C in a polymerization process.
Answer: Methyl ethyl ketone
20.____________ is the temperature at which the amorphous phase of the polymer is converted between rubbery and glassy states.
Answer: Glass transition temperature