16 Questions
What is strength?
The stress required to break the sample
Which type of strength increases with molecular weight?
Tensile strength
What is Young's modulus?
A measure of the stiffness of the material
What is toughness?
The energy absorbed by the material before it breaks
What is viscoelasticity?
A combined behavior of elasticity and plasticity
What is the glass transition temperature?
The temperature at which a polymer transitions from a hard, glassy state to a rubbery state
What is viscoelastic creep?
The time-dependent increase of strain in the material at a constant stress level
How are the mechanical properties of polymers affected by temperature?
Strongly affected
What is the order of increasing strength of polymers?
Linear < branched < cross-linked < network
What is the measure of a material's ductility?
Percent elongation to break
What is Young's modulus?
A measure of the stiffness of the material
What is the effect of molecular weight on the tensile strength of a polymer?
Increases due to entanglement of chains
What is toughness?
The energy absorbed by the material before it breaks
What is the combined behavior of elasticity and plasticity exhibited by polymers?
Viscoelasticity
What is the time-dependent increase of strain in the material at a constant stress level called?
Viscoelastic creep
Where does the glass transition temperature lie?
Near the upper temperature extremity
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.
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!
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