Physico-Mechanical Properties of Composites with Polymerization-Modified Fillers

4 Physico-Mechanical Properties of Composites with Polymerization-Modified Fillers (PMF) 

In [332] it was noted that the strength of samples cut out at different locations of an article made from filled thermoplastics by pressure molding may differ widely — which is due to the non uniform orientation of the polymer at different locations of the mold. The very high strength parameters of composites with PMF in molded specimens are obviously also due to orientation effects, while for standard mixed samples of similar composition (that is, a matrix which, apart from the filler, contains some superhigh molecular polyethylene imitating the PMF coats) the 

On the contrary, the impact strength is decreased in PVC-based samples filled with chalk modified by grafted PVC, as it is seen in Table 12 below. 

One can see that the relative elongation is lower in composites, but the modulus and, what is particularly important, durability of samples is higher. Obviously, the interaction between the polymeric coat and the matrix is particularly important in materials of this kind. This is illustrated by the data of Table 13 below. 

The authors of [210] used the measured enthalpy values (AH) to compare the compatibility of fillers coated with different materials with the base PVC by the procedure described elsewhere [99]. The results are given in Table 14. 

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