Influence of plantation climate and storage time on thermal and viscoelastic properties of natural rubber

Allen Jonathan Román; Jamelah Zena Travis; Juan Carlos Martínez Ávila; Tim A. Osswald; Allen Jonathan Román; Jamelah Zena Travis; Juan Carlos Martínez Ávila; Tim A. Osswald

doi:10.3934/bioeng.2021010

AIMS Bioengineering

2021, Volume 8, Issue 1: 95-111. doi: 10.3934/bioeng.2021010

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Influence of plantation climate and storage time on thermal and viscoelastic properties of natural rubber

1.
Polymer Engineering Center, Department of Mechanical Engineering, University of Wisconsin, Madison, WI, USA
2.
General Motors Global Technical Center, GMNA, Detroit, MI, USA
3.
Colombo Argentina Natural Rubber Society, Bogotá, Colombia

Received: 30 October 2020 Accepted: 31 December 2020 Published: 21 January 2021

The Sociedad de Caucho Colombo Argentina (SOCCA) collected natural rubber (NR) from Yarima, Colombia, for seven months spanning two years. The unvulcanized NR was used to conduct a preliminary study, part of a long-term study, to uncover some underlying mechanisms in charge of imparting variation between NR batches, such as the collection site's rainfall conditions and storage period by using calorimetry, rheometry, and a dynamic mechanical analyzer. The ultrasound study found that an increase in monthly rainfall increased the material's elastic constant at 10 MHz, and the crystallization study uncovered that the amount of crystallization decreased with increased rain while remaining relatively constant if rainfall was within the recommended rainfall amount for the tree. Additionally, stress relaxation measurements revealed that an increase in rainfall suggested an increase in the material's temperature sensitivity. The temperature sensitivity relates to the material's processability in which an increase in temperature with high sensitivity will have a more drastic decrease in stress during a relaxation test compared to a material with low sensitivity.
- natural rubber,
- rainfall,
- aging,
- rubber production
Citation: Allen Jonathan Román, Jamelah Zena Travis, Juan Carlos Martínez Ávila, Tim A. Osswald. Influence of plantation climate and storage time on thermal and viscoelastic properties of natural rubber[J]. AIMS Bioengineering, 2021, 8(1): 95-111. doi: 10.3934/bioeng.2021010

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Abstract

The Sociedad de Caucho Colombo Argentina (SOCCA) collected natural rubber (NR) from Yarima, Colombia, for seven months spanning two years. The unvulcanized NR was used to conduct a preliminary study, part of a long-term study, to uncover some underlying mechanisms in charge of imparting variation between NR batches, such as the collection site's rainfall conditions and storage period by using calorimetry, rheometry, and a dynamic mechanical analyzer. The ultrasound study found that an increase in monthly rainfall increased the material's elastic constant at 10 MHz, and the crystallization study uncovered that the amount of crystallization decreased with increased rain while remaining relatively constant if rainfall was within the recommended rainfall amount for the tree. Additionally, stress relaxation measurements revealed that an increase in rainfall suggested an increase in the material's temperature sensitivity. The temperature sensitivity relates to the material's processability in which an increase in temperature with high sensitivity will have a more drastic decrease in stress during a relaxation test compared to a material with low sensitivity.

Abbreviations

Natural Rubber

¹H-NMR

Proton Nuclear Magnetic Resonance

DMA

Dynamic Mechanical Analyzer

DSC

Differential Scanning Calorimetry

TGA

Thermogravimetric analysis

Conflict of interest

The authors declare no conflict of interest.

Author contributions

Allen Jonathan Román: investigation, evaluation, conceptualization, and writing; Jamelah Zena Travis: investigation, evaluation, and writing; Juan Carlos Martínez Ávila: investigation; Tim A. Osswald: conceptualization.

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