Question

Suggest a synthesis for the following block copolymer. PEO-block-PCL-block-PEO

PEO=poly(ethylene oxide),PCL=poly(caprolacton).

Please so clearly.

Answer 1

1.PEO=poly(ethylene oxide)

1st method

Initiation and polymerization of EO by a heterobifunctional initiator so that one of the functional groups reacts with the EO and the other group remains intact is shown in Figure above.Anionic polymerizations of EO from initiators containing a protected functional group such as potassium bis(trimethylsilyl)amide or (cyanomethyl)potassium, and termination by acidification, have been utilized to prepare heterobifunctional PEOs with a hydroxyl group at one endThe hydroxyl terminus can then be derivatized to produce more complex heterobifunctional polymers such as H₂N