Quiz on Rubber Networks and Elastic Modulus

What does the term 'entanglement trapping fraction' refer to?

• The fraction of rubber that is soluble

• The fraction of entanglements that contribute to the modulus

• The total weight of the rubber sample

• The density of the rubber material

Which equation was derived to predict the overall relation between elastic modulus and concentrations?

• E = (qp/Mo)X + 2e

• E = gvRT

• E = qp/Mo

• E = 2eTe

What is the significance of the 'crosslink density' in polymer materials?

• It measures the color stability of the polymer

• It determines the thermal stability of the polymer

• It indicates the solubility of the polymer

• It affects the mechanical properties and elasticity

How does temperature influence the elastic modulus of materials?

• Higher temperatures generally increase the elastic modulus

• Temperature only affects the elastic modulus in metals

• Temperature has no effect on the elastic modulus

• Higher temperatures generally decrease the elastic modulus

What role does molecular weight play in the properties of polymers?

• It determines the color of the polymer

• It only influences the density of the polymer

• It affects the melting point and viscosity

• It has no impact on the mechanical properties

What is the effect of crosslinking on the thermal properties of polymers?

• It increases the thermal conductivity

• It enhances the thermal stability

• It decreases the glass transition temperature

• It has no effect on thermal properties

How does the presence of fillers influence the mechanical properties of polymer composites?

• Fillers reduce the density of the composite

• Fillers have no impact on mechanical properties

• Fillers can improve strength and stiffness

• Fillers only affect the color of the composite

What is the relationship between molecular weight distribution and the properties of polymers?

• Molecular weight distribution does not affect properties

• A wider distribution improves thermal stability

• It only influences the color of the polymer

• A narrow distribution leads to more uniform properties

Choose the correct answers of the gaps in the graph

• a: Yield Stress

  b: Stress Hardening

  c: Stress Softening

• a: Yield Stress

  b: Stress Softening

  c: Stress Hardening

• a: Stress Softening

  b: Yield Stress

  c: Stress Hardening

• a: Stress Hardening

  b: Stress Hardening

  c: Yield Stress

What is the type of this polymer structure?

• Syndiotactic Polystyrene

• Syndiotactic Polypropylene

• Atactic Polypropylene

• Atactic Polystyrene