Successive Chain‐Growth Condensation Polymerization for the Synthesis of Well‐Defined Diblock Copolymers of Aromatic Polyamide and Aromatic Polyether

Abstract

Well-defined diblock condensation copolymers composed of an aromatic polyamide and an aromatic polyether have been synthesized by means of successive chain-growth condensation polymerizations. Polymerization of a polyamide monomer with an orthogonally difunctional initiator is accompanied with side reactions. On the other hand, polymerization with a monofunctional initiator afforded well-defined polyamide, which has been converted into a macroinitiator by introduction of a terminal 4-fluorobenzophenone unit. Well-defined diblock copolymers are obtained by polymerization of a polyether monomer in the presence of this macroinitiator.

Synthesis of Well‐Defined Polybenzamide‐block‐Polystyrene by Combination of Chain‐Growth Condensation Polymerization and RAFT Polymerization

“…Methyl 4-(octylamino)benzoate 2 p , [7] ethyl 3-(octylamino)benzoate 2 m , [9] and N-octyl-p-toluidine 3 [17] were prepared according to the established procedures. …”

Chain-Growth Condensation Polymerization for the Synthesis of Well-Defined Condensation Polymers and π-Conjugated Polymers

“…Synthesis of well-defined diblock condensation copolymer with controlled molecular weight and narrow polydispersity remains a challenging topic. We synthesized diblock copolymers composed of poly( m -benzamide) and aromatic polyether by means of successive chain-growth condensation polymerizations . When an orthogonal initiator for the synthesis of the polyamide and aromatic polyether segments was used, side reactions occurred at the 4-fluorobenzophenone unit of the initiator or the macroinitiator.…”

Well-Defined Polyamide Synthesis from Diisocyanates and Diacids Involving Hindered Carbodiimide Intermediates

“…This random step-growth mechanism in the condensation polymerization produces polymers with a wide range of molecular weight distributions. However, Yokozawa et al − have recently demonstrated the ability to control molecular weights and dispersities of condensation polymers such as polyamides, polyesters, and polyethers by “chain-growth condensation” of para-substituted AB-type aromatic monomers. They manipulated the condensation reaction through introduction of an activated functional group in the polymerization steps; thereby creating a preferred site and thus a sequence for the new monomer addition.…”