Design and analysis of single-factor experiments: Analysis of variance of the effect of rice husk ash and commercial fillers in NR compounds |
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| Authors: | Helson M da Costa Valéria D Ramos Leila L Y Visconte Cristina R G Furtado |
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| Affiliation: | (1) Instituto Politécnico – IPRJ, Universidade do Estado do Rio de Janeiro – UERJ, P.O. Box 97282, 28.601-970 Nova Friburgo, RJ, Brasil;(2) Instituto de Macromoléculas Professora Eloisa Mano – IMA, Universidade Federal do Rio de Janeiro – UFRJ, RJ, Brasil;(3) Grupo de Polímeros, Instituto de Química, Universidade do Estado do Rio de Janeiro – UERJ, RJ, Brasil |
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| Abstract: | Summary White rice husk ash (WRHA) and black rice husk ash (BRHA) were incorporated into natural rubber (NR) using a laboratory-sized
two-roll mill. A conventional vulcanization system was used for curing and physical tests of the NR vulcanized involved determining
of tensile and tear resistances. For comparison purposes, precipitated silica (Zeosil-175) and carbon black (N774) were used
too. Using the analysis of variance of single-factor experiments, it can be concluded that: BRHA is non-reinforcing filler
and its use is limited to 20 phr; WRHA is semi-reinforcing filler and the variation of filler loading (0 up to 50 phr) causes
the maximum variation upon tensile strength of NR compounds; and, that although carbon black and silica are reinforcing fillers,
a real reinforcement is reached up to 20 phr for tensile strength. |
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