Related Questions

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 of the above
Plasticisers are added to synthetic plastics to
A Impart flexibility
B Improve workability during fabrication
C Develop new improved properties not present in the original resin
D All of the above
Plasticisers are added to paints to
A Make it corrosion resistant
B Make glossy surface
C Give elasticity & prevent cracking of the film
D Increase atmospheric oxidation
While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the
A Low impact strength
B High flexibility
C Better finish and surface appearance
D High plastic deformation
Thermosetting polymers as compared to thermoplastic polymers
A Are formed by addition polymerisation
B Have three dimensional structure
C Have linear structure
D None of these
Branched chair polymers as compared to linear polymers have
A Higher melting point
B Higher tensile strength
C Lower density
D None of these
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
Branched chain polymers compared to linear polymers have higher
A Density
B Tensile strength
C Melting point
D Degree of irregularity in atomic packing
Phosphates (e.g., triceresyl, tributyl, tetrabutyl, tripheyl etc.) are added to polymers to act as
A Hardeners
B Anti-shrinkage agents
C Plasticisers
D Transparency improver

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