These are flashcards an notes made by students on topics like 'glassy', 'dsc' and 'non-crystalline', originating from:

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- Wageningen University
ISBN-13 9990002019708
665 Flashcards & Notes
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Study Cards on glassy, dsc, non-crystalline

What are characteristics of glassy materials?
Transparent, solid appearance and brittle.
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What is the difference between crystalline and glassy materials?
In glassy materials the molecules do not have an ordered structure and the volume of the system is larger.
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What kind of structures do biopolymers form at low water content?
Amorphous, non-crystalline structures.
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Glassy food products are extremely water sensitive T/F
True
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What is the difference between a first order and second order transition?
First order --> involving latent heat effects, such as ice melting or water evaporation, clear DSC curve
Second order --> change in heat capacity over a certain temperature range, no clear DSC curve
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How does water act as a plasticiser?
Water increases the free volume in the material and thereby the molecular mobility. It reduces the glass transition temperature.
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In what state is water below the equilibrium melting temperature?
Frozen
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