Polymers and Their Mechanical Properties

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Questions and Answers

What is strength?

The measure of the stiffness of the material

The ability to resist deformation

The stress required to break the sample (correct)

The energy absorbed by the material before it breaks

Which type of strength increases with molecular weight?

Flexural strength

Tensile strength (correct)

Compressive strength

Shear strength

What is Young's modulus?

A measure of the ductility of a material

A measure of the stiffness of the material (correct)

The energy absorbed by the material before it breaks

The time-dependent increase of strain in the material at a constant stress level

What is toughness?

The energy absorbed by the material before it breaks Signup and view all the answers

What is viscoelasticity?

A combined behavior of elasticity and plasticity Signup and view all the answers

What is the glass transition temperature?

The temperature at which a polymer transitions from a hard, glassy state to a rubbery state Signup and view all the answers

What is viscoelastic creep?

The time-dependent increase of strain in the material at a constant stress level Signup and view all the answers

How are the mechanical properties of polymers affected by temperature?

Strongly affected Signup and view all the answers

What is the order of increasing strength of polymers?

Linear < branched < cross-linked < network Signup and view all the answers

What is the measure of a material's ductility?

Percent elongation to break Signup and view all the answers

What is Young's modulus?

A measure of the stiffness of the material Signup and view all the answers

What is the effect of molecular weight on the tensile strength of a polymer?

Increases due to entanglement of chains Signup and view all the answers

What is toughness?

The energy absorbed by the material before it breaks Signup and view all the answers

What is the combined behavior of elasticity and plasticity exhibited by polymers?

Viscoelasticity Signup and view all the answers

What is the time-dependent increase of strain in the material at a constant stress level called?

Viscoelastic creep Signup and view all the answers

Where does the glass transition temperature lie?

Near the upper temperature extremity Signup and view all the answers

Study Notes

Mechanical Properties of Polymers

Understanding the mechanical properties of a material is important before its application in any field.
Strength is the stress required to break the sample and there are several types of strength.
Polymers follow the order of increasing strength: linear < branched < cross-linked < network.
Tensile strength of a polymer increases with molecular weight due to entanglement of chains.
Percent elongation to break measures the ductility of a material.
Young's modulus is a measure of the stiffness of the material.
Toughness is the energy absorbed by the material before it breaks.
The mechanical properties of polymers are strongly affected by temperature.
Polymers exhibit viscoelasticity, a combined behavior of elasticity and plasticity, depending on temperature and strain rate.
Viscoelastic relaxation modulus decreases with time and temperature.
Glass transition temperature lies near the upper temperature extremity.
Viscoelastic creep is the time-dependent increase of strain in the material at a constant stress level.

Mechanical Properties of Polymers

Understanding the mechanical properties of a material is important before its application in any field.
Strength is the stress required to break the sample and there are several types of strength.
Polymers follow the order of increasing strength: linear < branched < cross-linked < network.
Tensile strength of a polymer increases with molecular weight due to entanglement of chains.
Percent elongation to break measures the ductility of a material.
Young's modulus is a measure of the stiffness of the material.
Toughness is the energy absorbed by the material before it breaks.
The mechanical properties of polymers are strongly affected by temperature.
Polymers exhibit viscoelasticity, a combined behavior of elasticity and plasticity, depending on temperature and strain rate.
Viscoelastic relaxation modulus decreases with time and temperature.
Glass transition temperature lies near the upper temperature extremity.
Viscoelastic creep is the time-dependent increase of strain in the material at a constant stress level.

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Description

Test your knowledge on the mechanical properties of polymers with this quiz! Learn about the different types of strength, the factors affecting tensile strength, and the measures of ductility, stiffness, and toughness. Understand the impact of temperature on the mechanical properties of polymers and the viscoelastic behavior they exhibit. Take the quiz and enhance your understanding of the fascinating world of polymers!