Polymers

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Questions and Answers

What are polymers?

Polymers are macromolecules formed by linking together a large number of small molecules called monomers.

What is the single repeating unit of a polymer called?

The single repeating unit is called a monomer.

What are high polymers and oligopolymers based on?

High polymers have a high degree of polymerization, while oligopolymers have a comparatively low degree of polymerization.

What is the range of molecular weights of polymers?

<p>The molecular weights of polymers are generally in the range of 5000 to 200,000.</p> Signup and view all the answers

What is the degree of polymerization?

<p>The total number (n) of single monomer units combined together to form a polymer is known as the degree of polymerization.</p> Signup and view all the answers

What is the glass transition temperature (Tg) of a polymer?

<p>The temperature at which the polymer experiences the transition from rubbery to rigid states.</p> Signup and view all the answers

Why is the glass transition temperature important for polymers?

<p>It defines the upper and lower temperature limits for numerous applications, especially for semi-crystalline polymers, and influences the fabrication and processing procedures for polymers and polymer-matrix composites.</p> Signup and view all the answers

What happens to a rigid glass when it is heated above the glass transition temperature (Tg)?

<p>The sequences of events occur in the reverse order, transitioning from a rigid state to a rubbery state.</p> Signup and view all the answers

How do glass transition temperatures impact the applications of polymers?

<p>They define the upper and lower temperature limits for numerous applications, especially for semi-crystalline polymers.</p> Signup and view all the answers

Flashcards

What are polymers?

Macromolecules formed by linking together many small molecules.

What is a monomer?

The single, repeating structural unit of a polymer.

High vs. Oligo-polymers?

High polymers have a high degree of polymerization; oligopolymers have a low degree.

Degree of Polymerization

The total number of monomer units in a polymer chain.

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Glass Transition Temperature (Tg)

Temperature at which a polymer transitions from a rigid, glassy state to a rubbery state.

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Why is Tg important?

Defines temperature limits and influences polymer processing and composite fabrication.

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Heating above Tg?

Transitions from a rigid state to a rubbery state.

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How do glass transitions impact polymer use?

They define the upper and lower temperature limits for numerous applications, especially for semi-crystalline polymers.

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