These are flashcards an notes made by students on topics like 'viscosity', 'molecule' and 'glassy', originating from:

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- Wageningen University
ISBN-13 9990002019708
665 Flashcards & Notes
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Study Cards on viscosity, molecule, glassy

When do you call a gas a vapour?
When it can be condensed into a liquid under conditions that are close to ambient.
How does the molecular weight affect the glass transition temperature?
A longer molecule (higher Mw) has less freedom to move around. It will become glassy at a higher temperature compared to a similar, lower molecular weight component.
What happens to the diffusion coefficient when the viscosity rises very quickly to extremely high values?
Is is extremely low. The rate of diffusion (migration) in a glass is virtually zero.
What are 3 different ways to get crosslinks?
  1. Semi-crystalline biopolymers
  2. Chemically connecting the individual chains (e.g. S-S bridges)
  3. Physical crosslinks, caused by entanglements
How can you describe a material just above the glass transition?
Just above the glass transition is 70-100 degrees Celsius. It shows 'leathery' or 'rubbery' behaviour. The viscosity of systems in this area are described by Williams-Landell-Ferry (WLF) kinetics.
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