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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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).
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.
Explain why vulcanization improves the properties of natural rubber.
What is the main structural difference between low-density polyethylene (LDPE) and high-density polyethylene (HDPE)?
What is the repeating unit in the polymer polyethylene?
