A new one‐component anhydride‐cured epoxy with an aliphatic disiloxane dianhydride and metal‐coordinated lewis bases

Abstract

SynopsisThe use of 1,3-di (5-[ 2,2,1] -bicyclohexyl-2,3-dicarboxylic anhydride) -1,1,3,3-tetramethyldisiloxane, 1, as a curing agent in the presence of typical epoxy resins with Lewis bases as catalysts produces thermosets with HDTs of 32OoC. The solubility of 1 in the epoxy resin allows for the preparation of a one-component formulation. A latent catalyst was developed which employs amine complexes of cobalt bis (2,4-pentanedionate). These formulations exhibit long term storage a t ambient conditions, yet cure rapidly a t 180-200°C.

Synthesis, crystal structures and spectroscopic properties of cobalt(II) complexes with chelating sulfonylamidophosphate ligands

“…Cobalt(II) bdiketonate adducts are also good catalysts for a number of reactions, such as polymerisation, enantioselective Michael addition, etc. [3,4].…”

Cobalt (II) β-diketonate adducts as new precursors for the growth of cobalt oxide films by liquid injection MOCVD

“…Although some of them such as Co(acac) 2 (LL) [LL=2,2 0 -bipyridyl (130 C/10 À2 Torr), 1,10-phenantroline (190 C/ 10 À2 Torr)] [20] and Co 2 (acac) 4 (piperidine) (80 C/ 10 À4 Torr) [21] are volatile, no adduct was used so far for MOCVD applications. Cobalt b-diketonate adducts are also good catalysts for a number of reactions [22][23][24].…”

Kinetics and mechanistic investigation of epoxy-anhydride compositions cured with quaternary phosphonium salts as accelerators

“…Therefore one‐component compositions where epoxy resin and curing agent coexist with long pot life at ambient conditions are needed. Such systems are suitable for applications as coatings, adhesives or binders for prepregs in order to meet the industrial needs, for example, aircraft manufacturing …”

“…However, in the absence of catalysts, curing of epoxy–anhydride compositions is very slow and occurs at extremely high temperatures. To improve the energy and technological efficiency of the curing process catalysts are usually administered …”

“…Such systems are suitable for applications as coatings, adhesives or binders for prepregs in order to meet the industrial needs, for example, aircraft manufacturing. 3,4 The use of anhydride hardeners in such compositions gives materials with improved physical and mechanical properties, for example, enhanced heat resistance. 1,5 However, in the absence of catalysts, curing of epoxy-anhydride compositions is very slow and occurs at extremely high temperatures.…”