Polymer Classification and Growth
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Questions and Answers

What is the main characteristic of chain-growth polymerization?

  • Multiple growth points along the chain
  • Monomers add one-by-one to the same end of a growing chain (correct)
  • Oligomers react together to give longer chains
  • Covalently bonded linking units between chains

    • What type of polymerization is associated with step growth?

  • Addition polymerization
  • Condensation polymerization (correct)
  • Cross-linking polymerization
  • Linear polymerization

    • What is the term for regions of a polymer where chains are highly ordered with respect to one another?

  • Van der Waals regions
  • Cross-links
  • Oligomers
  • Crystallites (correct)

    • What type of polymer has short branches connected to the main chain?

    <p>Branched polymer</p> Signup and view all the answers

    What forces hold individual polymer chains together?

    <p>Van der Waals forces</p> Signup and view all the answers

    What is the characteristic of a cross-linked polymer?

    <p>Has covalently bonded linking units between chains</p> Signup and view all the answers

    What is the primary difference between synthetic polymers and biopolymers?

    <p>Method of synthesis</p> Signup and view all the answers

    Which type of polymer is prepared from alkenes through addition reactions?

    <p>Addition polymers</p> Signup and view all the answers

    What type of reaction is involved in the synthesis of condensation polymers?

    <p>Condensation reaction</p> Signup and view all the answers

    What is the main focus of the discipline that polymer chemistry is a part of?

    <p>Creation of new materials with improved properties</p> Signup and view all the answers

    What is the name of the discipline that involves the creation of new materials with improved properties?

    <p>Materials science</p> Signup and view all the answers

    How are polymer formulas typically written?

    <p>By enclose the repeating unit within brackets, followed by the letter n</p> Signup and view all the answers

    What happens to thermoplastic polymers when heated?

    <p>They soften to be molded.</p> Signup and view all the answers

    What type of polymers have both ordered crystalline regions and amorphous noncrystalline regions?

    <p>Thermoplastic polymers</p> Signup and view all the answers

    Why are thermosetting polymers rigid?

    <p>Because of the cross-links between chains</p> Signup and view all the answers

    What is a characteristic of elastomers?

    <p>They can be stretched and return to their original state</p> Signup and view all the answers

    What affects the density of a polymer?

    <p>The presence of substituents or branches</p> Signup and view all the answers

    What is the result of increased ordering in polymer chains?

    <p>The polymer becomes more dense</p> Signup and view all the answers

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