Structure and Properties of Polymers
Chemistry ⇒ Polymers and Macromolecules
Structure and Properties of Polymers starts at 11 and continues till grade 12.
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Describe the difference between addition and condensation polymerization.
Describe the effect of increasing the degree of polymerization on the physical properties of a polymer.
Explain the term 'copolymer' and give one example.
Explain the term 'tacticity' in polymers and its significance.
Explain why polyvinyl chloride (PVC) is rigid while plasticized PVC is flexible.
Explain why thermoplastics can be remolded upon heating, but thermosetting polymers cannot.
A polymer sample contains 3 molecules of molecular weight 10,000, 2 molecules of 20,000, and 1 molecule of 30,000. Calculate the number average molecular weight (Mn).
A sample of a polymer has a number average molecular weight (Mn) of 30,000 and a weight average molecular weight (Mw) of 45,000. Calculate the polydispersity index (PDI).
Which of the following is a condensation polymer? (1) Polyethylene (2) Polystyrene (3) Nylon-6,6 (4) Polypropylene
Which of the following is a copolymer? (1) Polyethylene (2) Nylon-6 (3) SBR (4) Teflon
Which of the following is a linear polymer? (1) Bakelite (2) Polyethylene (3) Melamine (4) Vulcanized rubber
Which of the following is a property of crystalline polymers? (1) High solubility (2) Sharp melting point (3) Low density (4) Amorphous structure
Fill in the blank: The ability of a polymer to dissolve in a solvent depends on the principle 'like dissolves __________'.
Fill in the blank: The ability of a polymer to regain its original shape after deformation is called __________.
Fill in the blank: The molecular weight of a polymer is usually expressed as __________ molecular weight.
Fill in the blank: The monomer of polyvinyl chloride (PVC) is __________.
State whether the following statement is true or false: Cross-linking increases the rigidity and thermal stability of polymers.
State whether the following statement is true or false: Natural rubber is a polymer of isoprene.
State whether the following statement is true or false: Polyesters are formed by condensation polymerization.
State whether the following statement is true or false: The degree of crystallinity in a polymer affects its density and mechanical strength.
