The change of mechanical properties,glass transition temperature and thermogravimetry(TG) of T700/epoxy and F-12/epoxy with aging time were investigated through the hydrothermal aging test(the aging temperature is 85 ℃,and the humidity is 95%).
The hygrothermal ageing mechanisms of two types of composites, T300/bismaleimide 5405 and T300/epoxy NY9200, were analyzed by investigating the changes in water absorption kinetics, IR spectrums, dynamic mechanical properties and surface appearance of the two composites and the matrix resins used in them during water immersion at 80℃.
Combined with the hygrothermal aging behavior of vinyl ester resin(VE) in distilled water at 65 ℃ and 95 ℃,the absorption characteristics,static and dynamic mechanical properties of its carbon fiber composite(CF/VE) were analyzed.
Uncatalyzed blends of bisphenol A dicyanate ester/epoxy novolac with different molar ratios were prepared. Hydrothermal ageing for times up to one month was performed and water take up profiles of those blends were determined by a gravimetric method.
Moreover, we have determined the role of the interphase formation on the practical adhesion before and after hydrothermal aging.
Hydrothermal aging of such catalysts is therefore limited during operation in the plant.
Based on the hydrothermal aging results, the possible existence of a larger two-phase (cubic+tetragonal) region is suggested, and the phase boundary between the cubic+tetragonal and cubic phase in the ZrO2-Sc2O3 system is proposed.
These materials were subjected to a specific hydrothermal aging process, which was prepared from a precursor solution containing AcAc with the molar ratio AcAc/Ti=1.
XRD patterns of S1 sample after hydrothermal aging for 4 hours.
Effects of hygrothermal ageing and thermal shock on reliability of interfacial adhesion between black oxide coated copper substr
The reliability of adhesion performance of the coating was evaluated before and after accelerated hygrothermal ageing, such as temperature cycling, pressure cooker test, and moisture sensitivity test followed by thermal shock.
The interfacial adhesion with a polyimide adhesive tape and an epoxy moulding compound was measured using the button shear and tape peel tests after hygrothermal ageing in an autoclave, high temperature ageing and thermal cycles.
Hygrothermal ageing at 121°C/100% RH in an autoclave was most detrimental to adhesion performance because of the combined effect of elevated temperature and high humidity.
Hygrothermal ageing and fracture of glass fibre-epoxy composites