Water absorption and desorption in an epoxy resin with degradation

Accelerated ageing versus realistic ageing in aerospace composite materials. IV. Hot/wet ageing effects in a low temperature cure epoxy composite

“…It is noticeable that the curves are different from those seen in the many neat‐resin systems previously studied,13–17, 25, 27–30 as well as reports documented on some fully cured epoxy composites 7, 21, 22. In this complex, reactive system there appears to be an induction period with a slow weight increase; followed by the middle stage with a high absorption rate and then finally a plateau with a very low weight increase rate occurs.…”

Water Transportation in Epoxy Resin

“…With NIR spectra and molecular simulation, , however, water molecules with non-hydrogen bond (free water), single hydrogen bond (single bound water), and double hydrogen bonds (double bound water) all can be observed. Although the results obtained by Pethrick, Musto, and Sung 9 seem to be consistent with each other to some extent, when compared with the observations of other authors, , three essential discrepancies still remain: (I) whether the double bond water molecules have a plasticizing effect or an antiplasticizing effect on the epoxy resins is argued; (II) whether all the water molecules with a typical relaxation time higher than 10 6 Hz (at room temperature) ought to be attributed to free water is uncertain; (III) whether the hydrogen bonds of single bound waters are formed in self-associated water molecules or along the polymer network is hard to differentiate.…”

Unraveling the Mechanistic Origins of Epoxy Degradation in Acids

“…Water is known to exist in bounded and unbounded states within amine-cured epoxy networks, based on dielectric studies, 34 diffusion studies, 18,42 and thermogravimetric analysis. 43 Instead, modulated DSC was presented in this work as another technique to concurrently evaluate the binding states of adsorbed HCl and the extent of plasticization of the epoxy matrix by adsorbed HCl.…”