Evaluation of Natural Rubber from Clones of Hevea Brasiliensis

Author:

Ferreira Mariselma1,Moreno Rogério M. B.2,Gonçalves Paulo S.3,Mattoso Luiz H. C.4

Affiliation:

1. 1Cie^ncia and Engenharia de Materiais, IFSC/USP, São Carlos, SP, Brazil

2. 2Departamento de Engenharia de Materiais, DEMa, UFSCar, São Carlos, SP, Brazil

3. 3Instituto Agrono^mico de Campinas, Campinas, SP,. Brazil

4. 4Embrapa Instrumentação Agropecuária, C.P. 741, 13560-970, São Carlos, SP, Brazil; email mattoso@cnpdia.embrapa.br

Abstract

Abstract The latex and natural rubber from rubber trees [Hevea brasiliensis (Willd. exAdr. de Juss.) Muell. Arg.] from clones (RRIM 600, IAN 873, GT 1 and PB 252) recommended to the state of São Paulo, Brazil, were studied in three different tapping systems. The parameters studied were dry rubber content (DRC), percentages of ash and of nitrogen, Wallace Plasticity (P0) and Mooney Viscosity (VR). The rubber properties vary considerably as a function of clone type, tapping method and season of the year. DRC tends to decrease in the beginning of the dry, cold season (May and June), whereas both nitrogen % and ash % increase in the same period. A good linear correlation was obtained for P0 and VR. The highest P0 and VR were obtained for RRIM 600.

Publisher

Rubber Division, ACS

Subject

Materials Chemistry,Polymers and Plastics

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