Extensional rheology of raw natural rubber from new clones of Hevea brasiliensis
Natural rubber (NR) is a biopolymer whose properties depend on the molecular structure of the 1,4‐cis polyisoprene chains, nonrubber constituents, environmental conditions, etc. NR has been characterized by Mooney viscosity, Wallace plasticity, nitrogen content (%N). However, these cannot effectivel...
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| Veröffentlicht in: | Polymer engineering and science 2012-01, Vol.52 (1), p.139-148 |
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| creator | Lotti, Cybele Moreno, Rogério M.B. Gonçalves, Paulo de S. Bhattacharya, Satinath Mattoso, Luiz H.C. |
| description | Natural rubber (NR) is a biopolymer whose properties depend on the molecular structure of the 1,4‐cis polyisoprene chains, nonrubber constituents, environmental conditions, etc. NR has been characterized by Mooney viscosity, Wallace plasticity, nitrogen content (%N). However, these cannot effectively account for clone's differences. The aim of this work is to use extensional rheology to characterize and differentiate NR samples as for clone type and the season of the year in comparison to the traditional characterizations. Three IAC 300 series and RRIM 600 clones of Hevea brasiliensis tapped between October 2006 (Oct_06) and August 2008 (Aug_08) were investigated. IAC 329 clones showed the least susceptibility to seasonal changes, whereas RRIM 600 was the most influenced. An opposite trend between extensional viscosity (ηE) and %N was established. The former was very sensitive to changes in the molecular structure of NR, being fundamental for monitoring purposes and strategic development of new rubber tree clones. POLYM. ENG. SCI., 2012. © 2011 Society of Plastics Engineers |
| doi_str_mv | 10.1002/pen.22056 |
| format | Article |
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However, these cannot effectively account for clone's differences. The aim of this work is to use extensional rheology to characterize and differentiate NR samples as for clone type and the season of the year in comparison to the traditional characterizations. Three IAC 300 series and RRIM 600 clones of Hevea brasiliensis tapped between October 2006 (Oct_06) and August 2008 (Aug_08) were investigated. IAC 329 clones showed the least susceptibility to seasonal changes, whereas RRIM 600 was the most influenced. An opposite trend between extensional viscosity (ηE) and %N was established. The former was very sensitive to changes in the molecular structure of NR, being fundamental for monitoring purposes and strategic development of new rubber tree clones. POLYM. ENG. 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| subjects | Applied sciences Biopolymers Cloning Exact sciences and technology Genetic aspects Molecular structure Monitoring Natural polymers Natural rubber Physicochemistry of polymers Physiological aspects Plasticity Polymers Raw materials Reinforced reaction injection molding Rheology Rubber Rubber trees Seasons Viscosity |
| title | Extensional rheology of raw natural rubber from new clones of Hevea brasiliensis |
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