Rheological Behavior of Raw Natural Rubber Coagulated by Microorganisms

Wang, Zhifen; Luo, Wenjie; Fang, Lin; Liao, Shuangquan; Li, Lefan; Hua, Lin; Li, Sidong; He, Chao

doi:10.4322/polimeros.2014.044

Cited by 10 publications

(7 citation statements)

References 26 publications

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“…Similar observations have also been reported in previous studies. 14,18 Figure 5 increases with increasing the frequency in all samples (see Figure 5(a)). This phenomenon is due to the fact that there is a sufficient time for rubber entanglement chains to recover from the deformation at low frequency but these entanglements do not have sufficient time to recover when the chains are deformed with high frequency and, thus, the modulus increases.…”

Section: Plasticity and Mooney Viscositymentioning

confidence: 87%

“…Such behavior is often found in rubber-based materials and is known as shear thinning. 14,18 With the shear rate held constant, the complex viscosity of the rubber decreased with increasing mastication time. This result can be explained by the fact that the mastication of the NR caused the M w to reduce due to chain breakage, which finally resulted in a reduction in the viscosity.…”

Section: Plasticity and Mooney Viscositymentioning

confidence: 99%

“…It can be seen that all the scattering profiles show a strong upturn at small q values, suggesting the presence of a heterogeneous structure in all the samples. [7][8][9][10][11][12][13][14][15][16][17][18][19][20] Thus, the distribution of the nonrubber component aggregations was heterogeneous. It is interesting that greater increases in the scattering intensity were observed when the rubber was masticated for longer times (5 and 10 min), while short mastication times showed lower increases compared to the sample without mastication.…”

Section: Saxsmentioning

confidence: 99%

See 2 more Smart Citations

The effect of mastication time on the physical properties and structure of natural rubber

Hayeemasae

Waesateh

Soontaranon

et al. 2020

Journal of Elastomers & Plastics

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The effect of mastication time in an internal mixer on the physical properties and microstructure of natural rubber (NR) was studied. The Mooney viscosity, plasticity, and complex viscosity reduced with increases in the mastication time due to the molecular breakdown of the rubber. The microstructural changes in the NR were studied using small-angle X-ray scattering. The results revealed that a reduction in the physical properties correlated with the structural changes, which occurred due to mastication. Increases in mastication time affected the distribution and size of the nonrubber component aggregations and the uniformity of the molecular structure of the NR.

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Section: Plasticity and Mooney Viscositymentioning

confidence: 87%

Section: Plasticity and Mooney Viscositymentioning

confidence: 99%

Section: Saxsmentioning

confidence: 99%

See 1 more Smart Citation

The effect of mastication time on the physical properties and structure of natural rubber

Hayeemasae

Waesateh

Soontaranon

et al. 2020

Journal of Elastomers & Plastics

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show abstract

“…Based on the obtained results the cure rheometric parameters point out to the 7 phr ME 100 composition as the most favorable, predicting the best possible interaction/distribution for this filler content with the elastomeric matrix [3,4,[6][7][8][9]22,26,27] .…”

Section: Cure Rheometric Parametersmentioning

confidence: 99%

“…Being polymers, the behavior of elastomeric compositions is intermediary between viscous and elastic states, the knowledge of the viscoelastic profile, which can be studied by rheology, being extremely important for the processing prediction as well as for the final properties of the vulcanized elastomer. In the elastomer field, the rheology is mainly studied with the aid of the following equipment: Oscillating Disc Rheometer, Mooney Viscometer and Rubber Processing Analyzer [1][2][3][4] .…”

Section: Introductionmentioning

confidence: 99%

Rheological properties and curing features of natural rubber compositions filled with fluoromica ME 100

et al. 2016

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SbstractThis work aims at studying not only the rheological behavior of natural rubber-based compositions by making use of different contents of fluoromica or ME 100 synthetic mica in a natural rubber (NR) matrix, but also the different filler-filler and matrix-filler interactions before and after curing. The ME 100 content in NR varied from 0 to 10 phr (parts per hundred parts of resin) and the results enabled to conclude on the influence of the mineral filler on the curing parameters, as well as on the limit amount of ME 100 for the best performance resulting from the best filler distribution/interaction in the polymer matrix. All data were compared with those of the unfilled composition. Based on complex viscosity, curing parameters, dynamic modulus and Payne effect tests it was concluded that the mica content limit for the best performance was 7 phr.

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Mechanism of the green coagulation processes on the construction of raw rubber network structure

Wang,

Huang,

Diao

et al. 2024

Polymer Engineering & Sci

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Acid coagulation is the most traditional latex coagulation technology, but this coagulation process leads to delayed vulcanization, corrosiveness, and environmental pollution. Different coagulation processes significantly impact the raw rubber network structure, leading to differences in the properties of both raw rubber and rubber vulcanizates. Raw rubber was prepared by three acid‐free coagulation processes: freeze, microwave, and flash drying. The network density, molecular chain flexibility, molecular weight, processing fluidity, and plasticity retention of the raw rubber were characterized, and the vulcanization characteristics, viscoelasticity, mechanical properties, and dynamic mechanical properties of the cured rubber composites were investigated. Raw rubbers prepared by microwave drying and flash drying had higher crosslink density, more flexible molecular chains, larger molecular weight, and wider molecular weight distribution, thereby increasing the crosslink density of rubber vulcanizates. The crosslink density of the raw rubber prepared by microwave drying versus the acid coagulated raw rubber increased by 51% to 105.71 mol/m3, the tensile strength increased by 16% to reach 28.12 MPa, and the elastic modulus and rolling resistance under dynamic stress increased. This paper provides a new idea for analyzing the relationship between the raw rubber network structure and the properties of vulcanized rubber.Highlights Acid‐free raw rubbers are prepared by freeze, microwave, and flash drying. Coagulation processes significantly impact the raw rubber network structures. Effects of raw rubber network structures on properties are investigated. Crosslink density, plasticity retention, and tensile strength are improved.

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Rheological Behavior of Raw Natural Rubber Coagulated by Microorganisms

Cited by 10 publications

References 26 publications

The effect of mastication time on the physical properties and structure of natural rubber

The effect of mastication time on the physical properties and structure of natural rubber

Rheological properties and curing features of natural rubber compositions filled with fluoromica ME 100

Mechanism of the green coagulation processes on the construction of raw rubber network structure

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