Characterization of the viscoelastic properties of an epoxy molding compound during cure

Evolution of viscoelastic behavior of a curing LY5052 epoxy resin in the glassy state

“…The findings have concluded that a thermo-rheologically simple time-temperature superposition is insufficient to characterize viscoelastic behavior. The study also concluded that the glassy state storage modulus is independent of the degree of cure, a behavior which is also confirmed by Sadeghinia et al 9 in the shear modulus domain, working with Novolac EPN1180 epoxy and bisphenol-A hardener. Furthermore, it is thought that using a carbon fiber-reinforced resin system as opposed to a neat resin sample may affect results regarding the storage modulus from the tests that have been performed in the solid state.…”

“…This argument was confirmed experimentally by Mours and Winters in. 16,17 Another study by Emri 18 also agrees with the observation by Mours and Winters, arguing that high molecular weight (9) T g − T g0…”

“…There exists research where viscoelastic behavior is assumed. [6][7][8][9][10] The question that arises is as to whether the material properties during curing are linearly or nonlinearly viscoelastic.…”

Kinetic and thermo-viscoelastic characterisation of the epoxy adhesive in GLARE

“…Therefore, the T g develops during cure, as a function of degree of cure and approaches its final value after complete curing (see e.g. [14]). The TMA measurement was done on a fully cured sample, which yielded a T g of about 92°C.…”

“…[9,10]. The determination of the change in viscoelastic behaviour during cure is possible but much more challenging [11][12][13][14][15]. The need for consideration of the viscoelasticity during cure of epoxy FM-94 is also investigated in this paper.…”