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Author Question: Can all materials exist as solids, liquids, and gases at various temperatures? Explain. What will ... (Read 136 times)

littleanan

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on: Aug 19, 2018
Can all materials exist as solids, liquids, and gases at various temperatures? Explain.
 
  What will be an ideal response?

Question 2

What is a heat history, as applied to polymers, and why is it important in polymer technology?
 
  What will be an ideal response?


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b614102004

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Reply #1 on: Aug 19, 2018
Answer to Question 1

Most simple, small atoms and molecules can exist in all three states of matter  solids, liquids, and gases. In some cases, especially when the molecules are large, the decomposition temperature of the material is lower than the melting point and therefore, increasing the temperature will cause decomposition before melting. Very large molecules will rarely exist as gases.

Answer to Question 2

Heat history is the accumulated total amount of thermal energy input into the polymer system. Hence, if the polymer has been processed twice, the heat history will be roughly twice as much as if the polymer were only processed once. This is important, especially for heat-sensitive polymers, because excessive processing, or processing at very high temperatures, can lead to degradation.


littleanan

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Reply #2 on: Aug 19, 2018
Both answers were spot on, thank you once again


b614102004

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Reply #3 on: Aug 19, 2018
Great! Please up vote :D


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