Resumo

NAPOLITANO, Bruno de A. et al. Natural rubber or chloroprene rubber and cellulose II composites: influence of particle size. Polímeros [online]. 2004, vol.14, n.4, pp. 223-229. ISSN 0104-1428.  http://dx.doi.org/10.1590/S0104-14282004000400006.

The aim of this work was to develop light composites with properties of technological interest by using elastomers of different polarities. This was achieved by employing cellulose II, in the powder form, as filler in natural rubber (NR) and chloroprene (CR). Cellulose II was obtained by coagulation of cellulose xanthate solution, in acid medium, under stirring and at room temperature, which represents, to our knowledge, a new way of obtaining this type of filler. Composites with 10phr of cellulose II and NR or CR were prepared having the particle size as variable. The mechanical properties and the microscopic aspect of the different composites were evaluated and compared with compounds without filler. The results indicated best results for the CR composite, influenced by the polarity of the elastomeric matrix and by the particle size, as a consequence of the milling conditions of the filler used.

Palavras-chave : Natural rubber; chloroprene rubber; cellulose II; mechanical properties; scanning electron microscopy.