Polymers: Introduction and Classification
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Questions and Answers

Which term describes the measure of how quickly polymer chains move relative to each other?

  • Tensile strength
  • Impact resistance
  • Melt viscosity (correct)
  • Melting temperature
  • What type of branching involves polymer chains that are connected linearly with no side chains?

  • Crosslinked
  • Polymeric
  • Linear (correct)
  • Branched
  • Which type of polymers are rarely used in their polymeric form in the lab-synthesized form?

  • Fibres
  • Plastics (correct)
  • Elastomers
  • Resins
  • What is the term for the individual units that are linked together to form a polymer chain?

    <p>Monomers</p> Signup and view all the answers

    Which term refers to the backbone of a polymer chain and can be classified as organic or inorganic?

    <p>Backbone chain</p> Signup and view all the answers

    What type of polymers have more than one type of monomer unit in their chain?

    <p>Copolymer</p> Signup and view all the answers

    What is the main purpose of stabilizers in plastic fabrication?

    <p>To prevent decomposition and discoloration at molding temperature</p> Signup and view all the answers

    Which compound is commonly used as a white pigment in plastic fabrication?

    <p>Zinc Oxide</p> Signup and view all the answers

    In compression molding, what type of plastics is the process applicable for?

    <p>Thermoplastics and thermosetting resins</p> Signup and view all the answers

    What is the temperature range typically used in compression molding for thermoplastics?

    <p>100-200°C</p> Signup and view all the answers

    What substance is added to plastic to prevent decomposition and discoloration at high molding temperatures?

    <p>Stabilizers</p> Signup and view all the answers

    Which of the following compounds is used to impart a blue color to plastics?

    <p>Ultramarine</p> Signup and view all the answers

    What is the main difference between Thermoplastics and Thermosetting plastics?

    <p>Thermoplastics can be softened on heating and remolded, while Thermosetting plastics cannot be reformed upon heating.</p> Signup and view all the answers

    What is the role of plasticizers in plastics compounding?

    <p>Impart freedom of movement and flexibility by neutralizing intermolecular forces between molecules.</p> Signup and view all the answers

    Which type of polymerization process do Thermoplastics typically undergo?

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

    What is the purpose of fillers in plastic compounding?

    <p>To reduce shrinkage and cost, improve hardness and tensile strength.</p> Signup and view all the answers

    Which of the following is NOT a common type of plasticizer?

    <p>Silicone</p> Signup and view all the answers

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