Synthesis and properties of new tetrafunctional epoxy resins containing oxyethylene units

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Abstract
Tetraglycidyl ethers of 2,2′,2″,2‴[sulfonyl bis(4,1‐phenylenenitrilo)] tetrakisethanol and 2,2′,2″,2‴[methylene bis(4,1‐phenylenenitrilo)]tetrakisethanol were synthesized and characterized. Curing reactivities of these new epoxy resins are investigated by differential scanning analysis. The mechanical, thermal, and dynamic mechanical properties of these resins cured with p,p'‐diaminodiphenylsulfone were examined and compared to those fo the conventional tetrafunctional epoxy resin (MY‐720). These new epoxy resins have the advantages of being easier to handle, having higher curing reactivities, and giving cured resins with higher toughness, compared with MY‐720 resin.