The One‐Stage Synthesis of Hyperbranched Polyimides by (A2+B4) Scheme in Catalytic Solvent

Abstract

New tetraamine monomer bis(2,3‐diaminophenoxy)benzene (BDAPB) was synthesized by reducing corresponding precursor bis(2,3‐dinitrophenoxy)benzene with hydrazine hydrate. Hyperbranched polyimide with terminal amino groups was synthesized by means of the one‐stage high temperature polycondensation of BDAPB with 2,2‐propylidene‐(1,4‐phenyleneoxy)diphthalic acid in catalytically active solvent – molten benzoic acid at 140°C by the scheme A2+B4. Examples of polymer‐analog transformations were shown of terminal amino groups to form acetamide and phthalimide derivatives.

OH‐ and NH2‐Terminated Hyperbranched Polysiloxanes: Controlled Synthesis, Characterization, Toughening, and Reinforcing Epoxy Resin

“…However, in these works, hyperbranched modifiers suffer from tediousness stepwise and higher cost, leading to difficulty in a large scale industrial application . In fact, a lot of papers are available in the literature, which describes the various synthetic approaches for the preparation of HBPSi using catalytic hydrosilylation, esterification, hydrolysis of siloxanes, reversible‐deactivation radical polymerization (RDRP), and proton transfer reactions (PTR) . However, these synthetic techniques suffer from different drawbacks.…”

Synthesis of Polyimides in the Melt of Benzoic Acid

“…The process of synthesis of PIs in molten BA can be carried out under relatively mild conditions (140°C, 1-2 hour) at slow inert gas flow [11][12][13]. Within 1 hour after the start of synthesis, fully cyclized polyetherimides (PEIs) and PIs with logarithmic viscosity values η log = 0.4-1.2 dL*g À1 (N-methyl-2-pyrrolidone (N-MP), 25°C), depending on the structure of the monomers, were isolated.…”

Hyperbranched Polymers with Controllable Topologies for Drug Delivery

“…Kricheldorf and co‐workers synthesis A 2 +B 4 ‐type hyperbranched polyesters by esterification of M8/M14 and M9/M15 . Aside from A 2 +B 4 ‐type hyperbranched polyimides, polyarylates and polytriazoles can also be synthesized from the copolymerization of M10/M16, M11/M17, and M12/M18 . However, for n >4, the construction of the A 2 +B n ‐type hyperbranched topology is rare, because the molecular weight cannot be easily increased before gelation occurs.…”

“…[26,27] Aside from A 2 + B 4 -type hyperbranched polyimides, polyarylatesa nd polytriazoles can also be synthesized from the copolymerization of M10/M16, M11/M17, and M12/M18. [28][29][30] However,f or n > 4, the construction of the A 2 + B n -type hyperbranched topology is rare, because the molecular weight cannotb ee asily increased before gelation occurs. Recently,K ong and co-workers [3c, d] presented the synthesis of soluble and fusible hyperbranched polyborosilazanes by using A 2 + B 6 -type polymerization compositions and by stopping the polymerization reaction before the gel point.…”