Resin matrices rating values

Other important parameters for the correlation between GJJ and GJ include the ductility or the failure strain, particularly the non-linear strain (Jordan and Bradley, 1988 Jordan et al., 1989) of the matrix resin, the bond strength of the fiber-matrix interface (Jordan and Bradley, 1987 Bradley 1989a, b), and the fiber V and their distributions in the composites (Hunston et al., 1987). A high failure strain promotes the intrinsic capacity of the resin to permit shear deformation, and is shown to increase the G and G. values almost linearly, the rate of increase being steeper for G j than for Gf. ... 

It was found that the total fraction of the free-volume in the system increases with increasing concentration of the polymeric filler. The temperature dependence of fg for the epoxy matrix was calculated on the supposition that free-volume is an additive value of the constituent components and using the temperature dependence of the fractional free-volume of polystyrene. It was found that with increasing filler concentration the fractional free-volume becomes greater than for pure epoxy resin. Since the fraction of the free-volume increases with increasing total surface area of the filler, it may be supposed that this effect is associated with the surface layers of polymer. It was found that the rate of free-volume expansion in a filled system is higher than in an unfilled one, which means that the expansivity of the free-volume... 

Nanoscale fillers, specifically nano-CaCOj and nano-SiOj were added to PEA by liu et al. [320] who found that improved mechanical properties were obtained around a critical filler concentration, specifically the concentration at the onset of percolation. Moreover, when the composites underwent hydrolysis, the inert filler played a role as a mechanical obstacle in the matrix and retarded the hydrolysis on the other hand, the interfacial area between the filler particle and the matrix resin increased with the filler, which would accelerate the hydrolysis. As a result of these two inverse effects, a minimum and a maximum value appeared in the plot of the degradation rate-fiUer content graph. 

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