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Questions and Answers
What is strength?
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?
Which type of strength increases with molecular weight?
- Flexural strength
- Tensile strength (correct)
- Compressive strength
- Shear strength
What is Young's modulus?
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?
What is toughness?
What is viscoelasticity?
What is viscoelasticity?
What is the glass transition temperature?
What is the glass transition temperature?
What is viscoelastic creep?
What is viscoelastic creep?
How are the mechanical properties of polymers affected by temperature?
How are the mechanical properties of polymers affected by temperature?
What is the order of increasing strength of polymers?
What is the order of increasing strength of polymers?
What is the measure of a material's ductility?
What is the measure of a material's ductility?
What is Young's modulus?
What is Young's modulus?
What is the effect of molecular weight on the tensile strength of a polymer?
What is the effect of molecular weight on the tensile strength of a polymer?
What is toughness?
What is toughness?
What is the combined behavior of elasticity and plasticity exhibited by polymers?
What is the combined behavior of elasticity and plasticity exhibited by polymers?
What is the time-dependent increase of strain in the material at a constant stress level called?
What is the time-dependent increase of strain in the material at a constant stress level called?
Where does the glass transition temperature lie?
Where does the glass transition temperature lie?
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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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