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Home Q & A Board Science-Related Homework Help Engineering
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aprdavis90 aprdavis90
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6 years ago
Below are three polymers to be examined for use as vascular graft materials:
  a) Poly(styrene)
 
  b) Poly(acrylonitrile)
 
  c) Poly(tetrafluoroethylene)
 
 
  a. Which two do you believe would exhibit the highest and the lowest crystallinity,
 
respectively, and why?
 
  b. What analytical technique would you use to determine the crystallinity of each material?
 

 
  c. Assume that the values below represent the Tg and Tm for each of the three materials:
  Based on this information, which of these materials would you select for this application?
 

  d. What structural characteristics of these polymers have an effect on the melting and glass
  transition temperatures?
 

  e. You are given another polymer to examine for this application. For a preliminary test,
  you run DSC on a sample, the results of which are shown below (Note: endothermic
  reactions are shown as positive on this graph). What are the Tm and Tg of the sample?
  Would this material be suitable?
 
 

 

 

 
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illyannam1illyannam1
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wrote...
#2
3 years ago
thank you
wrote...
#3
3 years ago
thank you
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