Podcast
Questions and Answers
What is the temperature range where polysaccharides typically degrade upon heating?
What is the temperature range where polysaccharides typically degrade upon heating?
above a certain temperature
What is the significance of the broad endotherm at 140 ℃ in the thermograms of polysaccharides?
What is the significance of the broad endotherm at 140 ℃ in the thermograms of polysaccharides?
water evaporation
What is the temperature of the endothermic melting peak observed in the neat PEO nanofiber?
What is the temperature of the endothermic melting peak observed in the neat PEO nanofiber?
around 137 ℃
What is the effect of chitosan (CS) on the crystallization of PEO in the blended nanofibers?
What is the effect of chitosan (CS) on the crystallization of PEO in the blended nanofibers?
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What is the temperature at which the endothermic peak is observed in the CS/PEO blended nanofibers?
What is the temperature at which the endothermic peak is observed in the CS/PEO blended nanofibers?
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The DSC thermogram is presented in Figure ______ C.
The DSC thermogram is presented in Figure ______ C.
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For the neat PEO nanofiber, a sharp ______ melting peak around 137 ℃ was observed.
For the neat PEO nanofiber, a sharp ______ melting peak around 137 ℃ was observed.
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Polysaccharides don't ______ but degrade upon heating above a certain temperature due to their links through hydrogen bonding.
Polysaccharides don't ______ but degrade upon heating above a certain temperature due to their links through hydrogen bonding.
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The CS/PEO blended nanofibers show a shift towards a ______ temperature (85 °C).
The CS/PEO blended nanofibers show a shift towards a ______ temperature (85 °C).
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This change was due to the ______ of CS on the crystallization of the PEO.
This change was due to the ______ of CS on the crystallization of the PEO.
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Study Notes
DSC Thermogram of PEO Nanofiber
- A sharp endothermic melting peak was observed around 137 ℃ for the neat PEO nanofiber.
- Polysaccharides typically degrade upon heating above a certain temperature due to hydrogen bonding links.
- Below degradation temperatures, polysaccharides display a broad endotherm (around 140 ℃) associated with water evaporation.
Effect of CS on PEO Nanofiber
- The CS/PEO blended nanofibers show a shift towards a lower temperature (85 °C) compared to pure PEO nanofiber.
- This change is attributed to the inhibition of CS on the crystallization of PEO.
DSC Thermogram of PEO Nanofiber
- A sharp endothermic melting peak was observed around 137 ℃ for the neat PEO nanofiber.
- Polysaccharides typically degrade upon heating above a certain temperature due to hydrogen bonding links.
- Below degradation temperatures, polysaccharides display a broad endotherm (around 140 ℃) associated with water evaporation.
Effect of CS on PEO Nanofiber
- The CS/PEO blended nanofibers show a shift towards a lower temperature (85 °C) compared to pure PEO nanofiber.
- This change is attributed to the inhibition of CS on the crystallization of PEO.
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Description
Analysis of the thermal properties of PEO nanofibers and their blends with CS, using DSC thermograms. Effects of temperature on polysaccharides and water evaporation are discussed.
