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Author Question: Discuss the physical, chemical, and mechanical properties of PMMA compared to polystyrene. What ... (Read 31 times)

CharlieWard

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on: Aug 19, 2018
Discuss the physical, chemical, and mechanical properties of PMMA compared to polystyrene.
 
  What will be an ideal response?

Question 2

What is the origin of the vast differences in physical properties between PVC (rigid) and vinyl? Explain why PE is not treated in the same way to create two very different physical states.
 
  What will be an ideal response?


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brittiany.barnes

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

PMMA and PS are both clear, noncrystalline materials that are extensively used when clarity is important. PMMA has much better clarity retention and weatherability. PS will yellow readily and embrittle. PMMA and PS are both brittle, although PMMA is somewhat stronger. Both materials are solvent sensitive with PS being much more sensitive to aromatic solvents.

Answer to Question 2

The cause of the differences is due to the plasticizers that are in place in the vinyl. These plasticizers allow for greater movement between the chains and give the feel of being much more flexible. PE is not treated the same way because PE is does not react with or accept plasticizers or solvents of any kind.


CharlieWard

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Reply 2 on: Aug 19, 2018
Great answer, keep it coming :)

cam1229

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Reply 3 on: Yesterday
Excellent

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