30 Questions
What is the effect of long exposure to air and sunlight on plastic articles containing chlorinated paraffin wax?
They become hard and brittle
Which type of polymers are formed by addition reaction?
Addition polymers
What is a characteristic of thermoplastic polymers?
They can be remoulded and reshaped
What is the molecular mass of condensation polymers?
Not a whole number multiple of the monomer units
What is the characteristic of thermosetting polymers in terms of solubility?
They are insoluble in organic solvents
What is the reason for thermoplastics becoming brittle on long exposure to air and sunlight?
Due to the evaporation of plasticizer with time
What is the characteristic of high density polyethene?
It has high tensile strength in one direction and low tensile strength at right angle to it
What is the name of the polymer obtained by condensation copolymerization of terephthalic acid with 1, 4-diaminobenzene?
Kevlar
What type of polymer is used to make baby-feed bottles and fridge containers?
Thermoplastics
What is the characteristic of carry bags made of low density polyethene?
They are soft and have same tensile strength in all directions
What is the primary reason for the softening of thermoplastic polymers when heated?
Absence of cross links between polymer chains
What is the characteristic of thermosetting polymers when heated?
They undergo permanent change and become hard and infusible
What is the role of plasticizers in polymers?
To reduce the interparticle forces between polymer molecules
What is the characteristic of thermoplastic polymers?
They become soft and flexible when heated
Why do thermosetting polymers become hard and infusible when heated?
Due to the presence of cross links between polymer chains
What type of polymer is formed when a single type of monomer is used in the polymerisation process?
Homopolymer
Which of the following copolymers is formed by the polymerisation of vinyl chloride with vinylidene chloride?
Saran
What is the characteristic of a copolymer formed by the polymerisation of two or more different monomers?
It has different properties than the corresponding homopolymer
What is the result of copolymerisation of monomer mixtures?
Formation of a copolymer with different properties than the corresponding homopolymer
What is an example of a homopolymer formed from a single type of monomer?
Polythene
What is the main difference between addition polymers and condensation polymers?
The elimination of byproduct molecules
Which type of polymer is characterized by a three-dimensional network structure?
Cross-linked polymers
What is the likely reason for the low tensile strength of branched chain polymers?
Irregular packing of the polymer chains
Which of the following polymers is an example of a condensation polymer?
Nylon-66
What is the typical characteristic of branched chain polymers?
Low density and boiling point
What type of intermolecular forces are present in elastomers?
Weak intermolecular forces
What is a characteristic of fibres?
Strong intermolecular forces and high tensile strength
What happens to thermoplastics when heated?
They can be softened and reshaped
What is a key difference between elastomers and fibres?
Elastomers have weak intermolecular forces, while fibres have strong intermolecular forces
What is a characteristic of thermoplastic polymers?
They can be softened and reshaped multiple times
This quiz covers the differences between thermoplastic and thermosetting polymers, as well as addition and condensation polymers. It also explores the properties of polymers and their uses.
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