Study on thermal degradation of sol and gel of natural rubber

Li, Sidong; Heping, Yu; Peng, Zheng; Chen, Zhu; Li, Pei-Sen

doi:10.1002/(sici)1097-4628(20000314)75:11<1339::aid-app3>3.0.co;2-0

Cited by 34 publications

(21 citation statements)

References 3 publications

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“…An absorption band is observed around 264 nm for the solution leached from Ls-NR, which could be associated with organic compounds present in the latex, including proteins, phospholipids, and amino acids [37] The high concentration of organic compounds is attributed to the liquid phase or Serum C from latex, which contains proteins, amino acids, carbohydrates, lipids, and nucleic acids (mainly associated with protein composition), which are generally called non-rubber components [38,39].…”

Section: Leached Compounds From Natural Rubbermentioning

confidence: 99%

Vulcanization, centrifugation, water-washing, and polymeric covering processes to optimize natural rubber membranes applied to microfluidic devices

et al. 2015

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Natural rubber microfluidic devices are based on the replication of microchannels and chambers through the casting of latex and combine the flexibility and transparency of the polymeric platform. Natural rubber is a proposed alternative material to prepare microfluidic devices, owing to the advantages of flexibility, ecofriendliness, and lower cost compared to other commonly used polymeric microfluidic materials. However, the challenges for the use of natural rubber are the leaching of compounds when it is in contact with fluids, the low stretching resistance, and the decreases of transparency rate in terms of the water absorption rate. To overcome these issues, we report the evaluation of the essential mechanical, optical, and structural properties of natural rubber for centrifuged and pre-vulcanized rubber membranes, as well as the polymeric coating over the membrane surfaces. We propose the centrifugation process for decreasing the leach composition of the natural rubber platform and vulcanization to improve the mechanical resistance of the polymeric membrane devices. The polymeric coating prevents the leaching of compounds from natural rubber membranes and water absorption without significant reduction in transparency or increase in the hydrophobicity of the surface. Once the centrifuging, vulcanization, and coating processes improve the rubber properties, this polymer will become an alternative flexible and low-cost material for microfluidic technology.

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Section: Leached Compounds From Natural Rubbermentioning

confidence: 99%

Vulcanization, centrifugation, water-washing, and polymeric covering processes to optimize natural rubber membranes applied to microfluidic devices

et al. 2015

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“…For the natural rubber, the main degradation processes between 270°C and 455°C (76% of mass loss) are attributed to the degradation of polymeric chains through crosslinking and chain scission, according to Figure . In the case of crosslinking a very small loss is associated with the formation of aldehydes, ketones, and carboxylic acids …”

Section: Resultsmentioning

confidence: 99%

Natural rubber/leather waste composite foam: A new eco‐friendly material and recycling approach

Garcia

Reis

Budemberg

et al. 2014

J of Applied Polymer Sci

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This article describes a new approach of recycling the leather waste (shavings) using it as filler in natural rubber foams composites. The foams were prepared using different amounts of leather waste (0–60 parts per hundred of rubber) and submitted to morphological (SEM microscopy) and mechanical analyses (cyclic stress–strain compression). The increase of leather shavings on the composite causes an increase of viscosity in the mixture, which reflects in the foaming process. This results in smaller and fairly uniform cells. Furthermore, expanded rubber has the biggest cell size, with more than 70% of cell with 1000 µm, while the composite with the higher concentration of leather has around 80% of total number of cells with 100–400 µm. The mechanical parameters were found to depend on the leather dust concentration. Moreover, the stiffness rises with the increase of leather shavings; consequently, the compression force for expanded rubber was 0.126 MPa as well as the composite with higher concentration of leather was 7.55 MPa. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41636.

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“…It is composed of about 30-40% rubber hydrocarbon as rubber latex particles and about 6-8% minor non-rubber components such as proteins, mineral salts, carbohydrates, organic acids and lipids dispersed in water [4,5] . These non-rubber substances are presumed to important role in controlling the structural change of rubber molecules during coagulation [6] and storage [7] processes, as well as affecting the properties of NR.…”

Section: Introductionmentioning

confidence: 99%

Rheological Behavior of Raw Natural Rubber Coagulated by Microorganisms

Wang¹,

Luo²,

Fang³

et al. 2014

Polímeros

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Abstract:Tests of the strain sweep, frequency sweep and stress relaxation for raw natural rubber coagulated by microorganisms (NR-m) and raw natural rubber coagulated by acid (NR-a) were carried out with the use of a rubber process analyzer (RPA). The results showed that the storage torque, complex viscosity of NR-m were higher than those of NR-a while the loss factor was lower. The effect of temperature on viscosity of raw NR was studied following the Arrhenious-Frenkel-Eyring model. The viscous flow behavior of NR-m was poorer than those of NR-a. Furthermore, stress relaxation measurements of raw NR showed a longer period of relaxation for NR-m.

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Study on thermal degradation of sol and gel of natural rubber

Cited by 34 publications

References 3 publications

Vulcanization, centrifugation, water-washing, and polymeric covering processes to optimize natural rubber membranes applied to microfluidic devices

Vulcanization, centrifugation, water-washing, and polymeric covering processes to optimize natural rubber membranes applied to microfluidic devices

Natural rubber/leather waste composite foam: A new eco‐friendly material and recycling approach

Rheological Behavior of Raw Natural Rubber Coagulated by Microorganisms

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