1. Science
  2. Chemistry
  3. a differential scanning calorimetry dsc plot for polyetheretherketone peek is...

Question: a differential scanning calorimetry dsc plot for polyetheretherketone peek is...

Question details

A differential scanning calorimetry (DSC) plot for polyetheretherketone (PEEK) is shown below.

PerkinElmer Thermal Anelysis Differential Scanning Calorimeter (DSC) Scan of Polyetheretherketone (PEEK) Peeks 339°C 3 20 18- 3 161 Peak 169 C 100 150 200 250 Temperature (C)
a) Answer the following questions about this polymer:
i. What occurs at #1?
ii. What occurs at #2?
iii. What occurs at #3?
iv. What is the approximate melting temp?
v. At what temp would you expect the polymer to undergo glass transition?

b) In the spaces below, determine if the DSC peak is endothermic or exothermic and explain the reason for your answer.
i. Peak #1:
ii. Peak #2:
iii. Peak #3:

c) Explain any predicted changes in the glass transition temperature (Tg) and relative degree of crystallinity for PEEK due to the changes listed below. Also shown below is the PEEK chemical structure for reference.

Chemical structure of PEEK

i. Change both of the ether linkages to ketone linkages.
ii. Change ether linkages to 2-carbon linkages (e.g., phenyl – C – C – phenyl).
iii. Rapidly cool/quench the PEEK polymer from its melted state to its glassy state.

Solution by an expert tutor
Blurred Solution
This question has been solved
Subscribe to see this solution