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Showing 1 to 20 of 60 for “"natural rubber"”.
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Coagulant dipping of natural rubber latex
… study has been made of' the coagulant dipping of natural rubber latex using calcium, chloride as the coagulant. The primary object of the investigation was to deepen understanding of the kinetics and the mechanisms of deposition. Results are given for the effect of variables such as solids …
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Peroxide prevulcanization of natural rubber latex
… of induced decomposition of tBPIB by certain non-rubber substances, and termination by recombination of radicals derived from tBPIB. But, the reason for the difference in the reaction order with respect to tBPIB concentration, at the initial stage of the reaction and during the run is not clear. …
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Graft polymerisation of antioxidants into natural rubber
… vinyl groups have been successfully bound to natural rubber in the presence of suitable free radical generators. Reaction parameters such as the mode of initiation, initiator system, reaction time, pH of the reaction medium, swelling time have been investigated in natural rubber latex. Of the …
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Mechanisms of antifatigue agents used in natural rubber
… αTOC was examined for its mechanisms during rubber fatiguing using HPLC analysis. Trimers of αTOC which were produced during vulcanisation are suggested to contribute to the fatigue activity observed. The evidence suggests that the trimers reproduce αTOC and a mechanism was proposed. Although …
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Wild lettuce as a source of natural rubber
A literature review of rubber-bearing plants in the United States was made, and the essentials of distribution, ecology and rubber content presented in condensed form. Filed lettuce of the specie Lactuca scariola was investigated to determine its place among the other rubber-bearing plants. Nearly …
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Further investigations of the prevulcanization of natural rubber latex
A comparison has been made of the vulcanization of NR in the latex form and in the dry form. In latex form, NR was found to vulcanize at a much faster rate than in the dry form. The faster rate of reaction in latex prevulcanizatIon is attributed to the presence of the aqueous phase which acts as a …
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A development of natural rubber extraction from Ericameria Nauseosa (rabbitbrush)
Natural rubber, primarily obtained from the Para rubber tree (Hevea brasiliensis),is a critical resource and has important properties, including elasticity, resistance toabrasion and impact resilience (e.g. road damage). Natural rubber also dissipates heatefficiently and is malleable at low …
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Sensorial characteristics of odour active compounds from raw natural rubber
Odorous emissions from rubber materials and processing can cause odour nuisance impacts in the surrounding community, resulting in industrial closure due to public complaints. This research aims to improve our understanding on odorants behaviour across different variabilities of rubber including …
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Elastocaloric properties of Natural Rubber for Solid-State Cooling Technologies
… air-cooling systems. In this framework, natural rubber (NR), a well-known renewable resource, is attracting increasing attention as an elastocaloric material, owing to its low cost, non-toxicity, long fatigue life, and remarkable elastocaloric properties, which arise from the synergistic …
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Mechanical Properties and Durability of Natural Rubber Compounds and Composites
… degradation upon the mechanical properties of natural rubber compounds and apply those effects to the life prediction of off axis 2-ply cord rubber laminates. The work examined both the quasi-static and dynamic mechanical properties of two natural rubber vulcanizates, which had been subjected …
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Effects of water-soluble polymers upon some properties of natural rubber latex
… water-soluble polymers upon some properties of natural rubber latex has been carried out. All the polymers, which were of two principal types, distinguished according to the rate of addition of polymerisation reactants, were prepared by free-radical initiated solution polymerisation. Two types …
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Modification of natural rubber by graft copolymerisation of non-ionogenic hydrophilic monomers in latex
… work is an investigation of the modification of natural rubber (NR) by graft copolymerisation of hydroxyethyl acrylate (HEA), hydroxypropyl acrylate (HPA), hydroxyethyl methacrylate (HEMA) and hydroxypropyl methacrylate (HPMA) in NR latex. Initial studies showed that, at low monomer …
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Effect of Crosslink Density on the Tearing of Gum Natural Rubber Cured with Dicumyl Peroxide (DCP)
… levels of DCP. The tensile behavior of gum natural rubber (NR) vulcanizates cured with dicumyl peroxide (DCP) was studied. The effect of crosslink density on tensile strength, tear strength, strain, 100% modulus, and the critical cut size was determined. Dumbbell specimens cured with …
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Treatment of natural rubber wastewater using oil palm empty fruit bunch, kaolin and zeolite as composite adsorbent
… study is to produce a composite adsorbent from natural zeolite, oil palm empty fruit bunch (EFB) and kaolin bound to chitosan to adsorb colour, chemical oxygen demand (COD) and ammoniacal nitrogen (NH3-N) from natural rubber wastewater. Batch and fixedbed adsorption techniques were used in this …
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Effect of Tensile Rate and Carbon Black on the Fracture of Natural Rubber and Styrene-Butadiene Rubber
… of precut NR is due to the formation of a rubber/ black network. But, reduce tensile rate can decrease the N115 content for reinforcing NR with all possible cut sizes. This is noted as a second turning point of black concentration.
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Factors Affecting the Thai Natural Rubber Market Equilibrium: Demand and Supply Response Analysis Using Two-Stage Least Squares Approach
<p>Natural rubber is a major export crop and the sector is an important source of employment in Thailand. Very few rubber studies in the past have examined the demand and supply equations simultaneously and the previously results are dated. The objectives of this study was to estimate the …
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Studies of physical properties of novel lithium polymer electrolytes.
… polyester polyurethane (TPU), modified natural rubbers and modified natural rubbers/polyethylene oxide polymer hosts have been investigated. Three types of modified natural rubber, namely 2S percent epoxidised natural rubber (ENR2S), SO percent epoxidised natural rubber (ENRSO) and …
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Tearing of Black-Filled (N660) Synthetic Polyisoprene Rubber Vulcanizates at Various Temperatures
Natural rubber (NR) has outstanding tack and strength in the unvulcanized state and high tensile and tear strength when vulcanized. These features are attributed to its ability to crystallize rapidly on straining. Synthetic isoprene rubber (IR), synthesized employing a stereospecific catalyst, …
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ELASTOCALORIC EFFECTS IN POLYMERS
… performance of the prototypical elastomer natural rubber was studied. A complex investigation of mechanical and elastocaloric properties was conducted using both experimental and computational methods. A computational model for elastocaloric effects in natural rubber was created and …
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