caa a22 4500 463229924 CHVBK 20180405153238.0 cr unu---uuuuu 170326e20070201xx s 000 0 eng 10.1007/s10853-006-1468-7 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1468-7 Fakirov S. Centre for Advanced Composite Materials and Department of Mechanical Engineering, The University of Auckland, 92019, Auckland, New Zealand aut On the application of the "rule of mixture” to microhardness of complex polymer systems containing a soft component and/or phase [Elektronische Daten] [S. Fakirov] The main goal of this work is to find a reasonable explanation for the frequently reported drastic deviations from the "rule of mixture” applied for calculation of the overall microhardness, H, of complex polymer systems comprising a soft, (with a glass transition, T g, or melting, T m, temperatures below room temperature) component and/or phase. According to the common practice, the contribution to H of the soft component and/or phase, H s, is considered as H s=0, which results in extremely large differences between the measured and calculated H values for systems comprising more than 20-25wt% soft component and/or phase. For such systems a different deformation mechanism during indentation process is postulated, namely "floating” of the solid particles in the soft component and/or phase, in addition to their plastic deformation. The contribution of the "floating effect” to the overall H is accounted for by the empirically derived relationship H=1.97T g−571. Using the reported data on H and T g for homopolymers, blockcopolymers and blends, the H values are recalculated and a good agreement with the experimentally measured values is found. A modified additivity law is suggested, which contains a term accounting for the contribution of the soft component and/or phase to the overall microhardness via the relationship between H and T g; its application results in much smaller differences between the measured and calculated H values. Springer Science+Business Media, LLC, 2007 Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/4(2007-02-01), 1131-1148 0022-2461 42:4<1131 2007 42 10853 https://doi.org/10.1007/s10853-006-1468-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1468-7 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Fakirov S. Centre for Advanced Composite Materials and Department of Mechanical Engineering, The University of Auckland, 92019, Auckland, New Zealand aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/4(2007-02-01), 1131-1148 0022-2461 42:4<1131 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer