Podcast
Questions and Answers
What is the primary reason for the end groups of polymers residing perpendicular to the bulk of the polymers?
What is the primary reason for the end groups of polymers residing perpendicular to the bulk of the polymers?
- The polymer surfaces are faced with an oil atmosphere
- The polymer surfaces are always flat
- The end is more hydrophilic compared to the bulk
- The end is less hydrophobic compared to the bulk (correct)
What is the shape of the polymer chain at the surface when the amount of polymer is small?
What is the shape of the polymer chain at the surface when the amount of polymer is small?
- Brush shape
- Tangled shape
- Pancake shape (correct)
- Mushroom shape
What happens as the concentration of polymer increases?
What happens as the concentration of polymer increases?
- The polymer ends form brushes (correct)
- The surface becomes more hydrophobic
- The polymer chain lays parallel to the surface
- The polymer chain becomes more tangled
What is the definition of a surface used in this context?
What is the definition of a surface used in this context?
Why do the polymer surfaces generally differ from the bulk material?
Why do the polymer surfaces generally differ from the bulk material?
What happens when the concentration of polymer is increased, but not high enough to form brushes?
What happens when the concentration of polymer is increased, but not high enough to form brushes?
What is the primary focus of Auger electron spectroscopy (AES) and x-ray photoelectron spectroscopy (XPS)?
What is the primary focus of Auger electron spectroscopy (AES) and x-ray photoelectron spectroscopy (XPS)?
What is the depth of analysis for AES and XPS?
What is the depth of analysis for AES and XPS?
What is the process that occurs during an Auger transition?
What is the process that occurs during an Auger transition?
What is the equation that expresses the energy of the Auger electrons?
What is the equation that expresses the energy of the Auger electrons?
What is the process that occurs during XPS?
What is the process that occurs during XPS?
What is the energy equation that expresses the kinetic energy of the x-ray photoelectrons?
What is the energy equation that expresses the kinetic energy of the x-ray photoelectrons?
