Fourier‐transform infrared study of the reversible interaction of water and a crosslinked epoxy matrix

Abstract

Fourier‐transform infrared spectroscopy is utilized to characterize the interaction of a crosslinked epoxy matrix with sorbed water vapor. The perturbations of the epoxy vibrational spectrum are evidence for weak H bonding between water molecules and polar groups in the resin. The epoxy‐water interactions are reversible.

Synthesis and characterization of a high refractive diglycidyl ether of thiodibenzenethiol epoxy resin

“…1 [13,14]. The appearance of a broad absorption peak at 3,474 cm -1 and the characteristic peak of water at 1,631 cm -1 indicated that a small amount of water was absorbed by DGETDBT, as reported by Antoon et al [15]. 1 H NMR spectrum of DGETDBT epoxy resin was shown in Fig.…”

Irreversible effects of hygrothermal aging on DGEBA/DDA epoxy resin

“…Although some workers have found 6,9 that water absorption induced more or less reversible degSample Preparation radation (plasticization), prolonged hygrothermal aging may lead to irreversible damage of the A model epoxy resin based on diglycidyl ether of resin due to susceptibility of the polymer to hydrobisphenol A (DGEBA) and dicyandiamide (DDA) lysis, oxidation, and change of the effective averwithout fillers was studied. The material was supage crosslinked molecular weight.…”

A study by Raman, near-infrared and dynamic-mechanical spectroscopies on the curing behaviour, molecular structure and viscoelastic properties of epoxy/anhydride networks

“…A slight enhancement of the water content is noticed as the R value increases, which likely reflects the increased concentration of ester carbonyls in the networks at higher R values. These groups have been demonstrated to form H-bonding interactions with water molecules acting as proton acceptors, thus enhancing the interactive character of the network [23,24]. In any case, the equilibrium water sorption goes from 0.49% to 0.76% and is considerably lower than that for a TGDDM/DDS resin, which in the same conditions absorbs 4.0% of water [25].…”