Naturkautschuk

Fig. 2: Block diagram for the preparation of GNP-SP adduct.

Natural Rubber latex with graphene Nanoplatelets (GNPs)

Effect of the Functionalization of graphene Nanoplatelets with a Janus Pyrrole Molecule on mechanical and electrical Properties of natural Rubber Nanocomposites

Nanokomposite wurden durch Mischen von NR-Latex mit Graphene Nanoplatelets (GNPs) hergestellt, die mit einer Janus Pyrrol Komponente durch einen einfachen, nachhaltigen Prozess mit einer sehr hohen Atom- und Kohlenstoffeffizienz nahezu zu 100 % funktionalisiert wurden. more...

April 14. 2020 - Research news

Fig. 1: Raman spectra of alkanes, the enlargement of the C H stretching vibrations, and a further signal in the area of symmetrical vibrations of CH2. Raman spectra are compared with the IR spectra of n-hexane (right hand).

A spectroscopic Method for predicting Viscosity

Correlation between molecular and spectroscopic Properties of Polymers

The Mooney viscosity (MV) of rubbers is known to be an important processing parameter in the rubber industry. more...

August 2. 2019 - Research news

Fig. 2: Crosslink densities as a function of the amount of devulcanization aid (DPDS).

Rubber-Recycling

Effects of Devulcanization Aid on mechanical and thermal Properties of devulcanized Rubber/Virgin Natural Rubber Blends

Thermo-chemical devulcanization of used truck tires was conducted using various amounts of diphenyl disulfide (DPDS) as a devulcanization aid. more...

May 15. 2019 - Research news

Fig. 4: Plausible crosslinking junctions for the vulcanized natural rubber.

Activation Energy of the Prevulcanization

Mechanism of Prevulcanization of Natural Rubber through Latex-State NMR Spectroscopy

Mechanism of prevulcanization of natural rubber (NR) was investigated by latex-state NMR spectroscopy. more...

February 18. 2019 - Research news

Seichi Kawahara_

LEDPNR/PLA Blend

Crystallization Behavior and mechanical Property of epoxidized natural Rubber/Poly (lactic acid) Blend

Liquid deproteinized natural rubber with an epoxy group (LEDPNR) / Poly(lactic acid) (PLA) blend was prepared by mixing and subsequent annealing at 200°C for 20 min. more...

April 16. 2018 - Research news

Kohjiya_

Review

Crystallization of Natural Rubber: Its unique Feature

Crystallization of natural rubber (NR) has been uniquely complicated. This review is to disentangle the complications. Low-temperature crystallization (LTC) is a difficulty when using NR during winter in the early 19th century, overcome by vulcanization. In 1925, strain-induced crystallization (SIC) was firstly reported, but it has remained obscure for long till the advent of time-resolved […] more...

October 9. 2017 - Research news

Amornsakchai_

Stress-Strain Curves of BR, NBR and SBR

Synchrotron WAXS Studies of stretched Natural and Synthetic Rubber Networks showing an Upturn in Stress-Strain Curves*

Natural rubber (NR) displays very distinct stress-strain curve with an upturn in the stress at high elongations while most synthetic rubbers do not. This behavior has been associated with strain-induced crystallization. Here we show that three non-crystallizing weak synthetic rubbers, i.e. BR, NBR and SBR, could be reinforced in such a way that their stress-strain […] more...

September 1. 2017 - Research news

riyajan_

Rubber as Coating-Material

Chemical Modification of Poly (Vinyl Alcohol) with Starch/Natural Rubber and its Application for the Encapsulation of Urea Fertilizer

The objective of this work was to study the chemical modification of poly (vinyl alcohol) (PVA) with cassava starch (St) and natural rubber (NR) by using potassium persulfate (K2S2O8) as an initiator and its application in controlling urea release. The structure of the PVA grafted with St and NR was supported by ATR-FT-IR results. The […] more...

December 7. 2016 - Research news

seiichi-kawahara_

NMR Spectroscopy of Latex

Mechanism of heterogeneous Hydrogenation of natural Rubber in Latex

Heterogeneous hydrogenation of natural rubber (NR) present in disper-soids in latex is studied by latex-state 13C-NMR spectroscopy in order to elucidate its mechanism. The hydrogenation is carried out with palladium catalyst under hydrogen gas atmosphere at 297 to 353 K for various reaction times. The conversion of hydrogenation is found to be dependent upon reaction […] more...

October 12. 2016 - Research news

florence-bruno_unbenannt

Mastikationsexperimente and Naturkautschuk

Behavior of masticated natural Rubber highlighted by LAOS Rheology

Mastication experiments were performed on natural rubber in an intermeshing mixer by varying the process parameters. The control of rubber temperature during mixing emerged as the key factor of the process. Two different fill factors and several processes were used to reduce viscosity. LAOS measurements with Fourier Transform allowed to study and distinguish the final […] more...

October 6. 2016 - Research news

Unbenannt

Silane-based Additives

Reinforcement Efficiency of Silica in Dependence of different Types of Silane Coupling Agents in Natural Rubber-based Tire Compounds

The effects of 3-Octanoylthio-1-propyltriethoxysilane (NXT), 3-mercaptopropyl-di(tridecan-1-oxy-13-penta (ethylen-eoxide)) ethoxysilane (VP Si-363) and vinyltriethoxysilane (VTES) on the properties of silicafilled NR compounds are studied in comparison with bis-(trieth-oxysilylpropyl) tetrasulfide (TESPT). more...

May 4. 2016 - Research news

The Influence of Thermal Ageing of Natural RubberStyrene Butadiene Rubber Vulcanizates on Steady state and Dynamic Wear Behaviour

Ageing of Rubber

The Influence of Thermal Ageing of Natural Rubber/Styrene Butadiene Rubber Vulcanizates on Steady state and Dynamic Wear Behaviour

The aim of this work is to explore the influence of thermal ageing on wear resistance of cured rubber which has been based on varied composition of Natural rubber/Styrene butadiene rubber compounds. more...

April 4. 2016 - Research news

Sa-Ad Riyajan_Unbenannt

Preparation and Properties

Novel modified Natural Rubber with Chitosan Nanofibers

The aim of this work was to prepare and characterize the nanofiber obtained from epoxidized natural rubber-g-chitosan (ENR-g-CTS)/poly(vinyl alcohol) (PVA) blends. The preparation of ENR-g-CTS/PVA blend nanofibers was carried out using the electrospinning technique. The morphology of the ENR-g-CTS/PVA blend nanofiber was confirmed by SEM, TEM and AFM. more...

December 16. 2015 - Research news

Oils for Rubber Compounds

Petroleum-based Safe Process Oils in NR and NR/SBR Blends: Part III. Effects of Oil Types and Contents on the Properties of Carbon Black Filled Compounds

Part III. Effects of Oil Types and Contents on the Properties of Carbon Black Filled Compounds The influences of DAE-, TDAE- and MES-oils on the properties of carbon black filled NR and NR/SBR blend compounds are discussed. The properties are strongly affected by oil contents, but less by the oil types. Compounds with DAE have the lowest Mooney viscosity but highest complex viscosity and Payne effect. SEM micrographs show that carbon black is finely dispersed in the compounds, except for MES which shows slightly poorer filler dispersion than TDAE and DAE. The use of TDAE and MES in NR clearly influences the properties related to changes in Tg and viscoelastic behavior. Use of MES gives the best elastic response in NR, while TDAE gives the best response for NR/SBR blend vulcanizates. more...

September 16. 2015 - Research news

Additives & Fillers

Preparation and Physical Properties of Green Rubber Composite from Natural Rubber and Coconut Meal Waste

To date, the biopolymer is attractively used to blending with natural rubber (NR) to enhance its mechanical properties and biodegradable ability. Therefore, the objective of this work is to study the preparation of biopolymer composite from NR and coconut meal waste (CF filler) by using maleic anhydride (MA) as a crosslinking agent. more...

June 19. 2015 - Research news

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