Strain-Crystallization of Guayule and Hevea Rubbers

Choi, Ik-Sung; Roland, C. M.

doi:10.5254/1.3538425

Cited by 39 publications

(40 citation statements)

References 30 publications

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“…To avoid strain-induced crystallization, the maximum extension was limited to 100%. 25 A finite element method 26 was implemented using ABAQUS. The membrane was discretized using 100 3-node axi-symmetric shell elements, each employing a quadratic interpolation function.…”

Section: Methodsmentioning

confidence: 99%

Strains in an Inflated Rubber Sheet

Mott

Roland

Hassan

2003

Rubber Chemistry and Technology

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A technique to measure the strain distribution of an inflated membrane is described, and applied to natural rubber inflated to pole biaxial strains of 12%, 26%, and 33%. The radial strain was found to be nearly constant over the entire surface, while the circumferential strain falls to zero at the edge. Thus, biaxial deformation is limited to a narrow region in the vicinity of the pole. These results are quite different from (the very limited) data published previously. The stressstrain behavior was also measured in uniaxial tension, and the strain distribution of the inflated membrane calculated using finite elements. The experiment results and the modeling were in good agreement.

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Section: Methodsmentioning

confidence: 99%

Strains in an Inflated Rubber Sheet

Mott

Roland

Hassan

2003

Rubber Chemistry and Technology

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“…These results are consistent with an earlier comparison of these rubbers at a fixed crosslink density (single value of modulus = 1 MPa), 25 in which the failure performance was in the order GR > RSS > DPNR. This rank ordering parallels the strain-crystallizability of the rubbers, 35 indicating that the non-polymeric contaminants nucleate crystallization. Consequently, to some extent, the contaminants govern the failure performance of the rubbers.…”

Section: Unfilled Elastomersmentioning

confidence: 93%

“…25 Such a result is due to the enhancement of strain-crystallization by the non-polymeric ingredients of the material. 35 In the present work, we extend the comparison to rubbers having a range of crosslink densities, and also examine the effect of carbon black on the relative performance.…”

Section: Rubber Chemistry and Technologymentioning

confidence: 99%

“…(ii) Strain crystallizability, which in the gum rubbers varies as GR > RSS > DPNR, 35 must be equivalent when the rubbers are reinforced with carbon black. This is consistent with the well-known fact that strain crystallization is promoted by carbon black.…”

Section: Carbon Black Filled Elastomersmentioning

confidence: 99%

“…By the same token, the enhancement of strain-crystallizability in standard grades of natural rubber can yield better failure properties. 35 In this paper we describe a study of the failure properties of naturally-occurring cis-1,4-polyisoprenes, both the common Hevea brasiliensis, NR, from rubber trees in southeast Asia, and guayule rubber, GR, obtained in North America from the shrub, Perthenium argentatum grey. During the first part of the twentieth century, before development of the Hevea rubber industry, the guayule shrub was a primary source of rubber for the United States 36 ; however, presently there is no commercial production.…”

Section: Introductionmentioning

confidence: 99%

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The Fatigue Life of Hevea and Guayule Rubbers

Santangelo

Roland

2001

Rubber Chemistry and Technology

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The enhanced crystallizability of guayule rubber (GR) in comparison to Hevea-based natural rubbers (NR) gives rise to better failure properties in unfilled, or "gum," GR. The origin of this behavior is the ability of the non-polymeric contaminants in GR to nucleate strain crystallization; a similar effect is operative in less pure grades of NR. However, when compounded with carbon black, this superiority of GR over NR is lost. The mechanical hysteresis arising from the carbon black, along with the latter's enhancement of strain crystallization, supercede the contribution from the contaminants. Consequently, in contrast to the behavior of the gum rubbers, the fatigue lifetimes of GR-and NR-based compounds are equivalent.

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Rubber, Guayule

Cornish

Schloman

2004

Encyclopedia of Polymer Science and Technology

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Guayule ( Parthenium argentatum ) is a rubber‐producing woody shrub native to the Chihuahuan Desert of northern Mexico and Texas. Guayule produces linear, high molecular weight natural rubber that can have physical properties and applications equivalent to those of Hevea ( Hevea brasiliensis ) rubber. Guayule rubber can be extracted as a solid bulk polymer or as a latex. Guayule also is one of very few rubber‐producing plants to have ever been used commercially for rubber production. Although guayule rubber was commercially produced in the early part of the last century, more recent efforts to reinstate production have not led to commercial success because the production costs of bulk rubber were too high to permit direct competition with Hevea rubber. Guayule commercialization has been revitalized in recent years by use of the plant to produce low protein hypoallergenic latex, a higher value rubber raw material.

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Strain-Crystallization of Guayule and Hevea Rubbers

Cited by 39 publications

References 30 publications

Strains in an Inflated Rubber Sheet

Strains in an Inflated Rubber Sheet

The Fatigue Life of Hevea and Guayule Rubbers

Rubber, Guayule

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