Polymers: Introduction and Classification
17 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

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 (D)</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 (D)</p> Signup and view all the answers

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

<p>Copolymer (D)</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 (D)</p> Signup and view all the answers

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

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

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

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

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

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

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

<p>Stabilizers (C)</p> Signup and view all the answers

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

<p>Ultramarine (C)</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. (B)</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. (A)</p> Signup and view all the answers

Which type of polymerization process do Thermoplastics typically undergo?

<p>Addition polymerization (D)</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. (C)</p> Signup and view all the answers

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

<p>Silicone (B)</p> Signup and view all the answers

More Like This

Use Quizgecko on...
Browser
Browser