Seichi Kawahara_


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



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


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


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


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


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


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


Removal of Proteins from natural Rubber Latex and Gloves

Removal of proteins from natural rubber was performed by leaching and deproteinization. The leaching was carried out for commercial natural rubber glove, whereas deproteinization was for commercial high ammonia natural rubber latex (HANR) in the presence of urea, sodium dodecyl sulfate (SDS) and acetone. more...

March 13. 2015 - Research news


Physical Properties of green Composite: Low grade natural Rubber/ Cassava Starch/ Palm Fiber

The green composite was made from low grade natural rubber (LNR), cassava starch (CSt) and palm fiber by using two-roll mill and compression molding. Before adding palm fiber, the elongation at break of LNR/CSt blend was improved as a function of CSt content due to plasticizer of CSt. more...

March 13. 2015 - Research news


Preparation, Microstructure and electrical Conductivity of high Aspect Ratio Carbon Nanotubes reinforced Natural Rubber Nanocomposites

A new method of preparing carbon nanotube/Natural rubber (CNT/NR) composites with high-aspect ratio carbon nanotubes was developed. Transmission electron microscopy (TEM) images revealed that the high-aspect ratio CNT was dispersed very well in the NR matrix. more...

March 13. 2015 - Research news


Dispersion Enhancement of Petroleum-based Sulfur in Natural Rubber by the Use of TDAE oil Coating Technique

The article demonstrates that the sulfur classified as a by-product from petroleum refining process (PS) is capable of being used as a curing agent. Poor dispersion of the PS is still of high concern and, thus, attempts have been made to use a common rubber plasticizer, namely treated distillate aromatic extract (TDAE) oil, as a dispersing agent. more...

March 13. 2015 - Research news

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