Difference between PORAPAK Q and PORAPAK S?

[alquimica]

What is the difference between Porapak Q and Porapak S?
Thanks

[chromatographer1]

The difference is the recipe of the co-polymers used with divinyl benzene.

Styrene, 4-vinyl pyridine, n-vinyl 2 pyrrolidone, and ethylene glycol dimethacrylate are commonly used.

This gives a different polarity to the structure of the plastic and permits different size pores to a degree.

Q is more non-polar. S is more polar than Q. N and T are also polar.

Their selectivities are slightly different as well as their temperature limits.

best wishes,

Rod

[alquimica]

Thank you.

[GasMan]

Try this site at Valco instruments. It gives the relative retenetion times of various compounds on their HayeSep products. HayeSep is virtually identical to Porapak.

http://www.vici.com/hayesep/rettimes.php

Gasman