Natural rubber

Fachartikel

Development of a Rubber Pressure Moulding Technique for Fiber Reinforced Plastics

A rubber pressure moulding (RPM) technique is developed to prepare fiber reinforced plastic components (FRP) using glass fiber and epoxy resin. The technique is based on the matching die set, where the die is made of hard metal like steel and the punch from flexible rubber like materials. The use of a flexible rubber punch […] mehr...

26.April 2006 - Neues aus der Forschung

Effect of Heterogeneities on the Physical Properties

Conventional and Efficient Crosslinking of Natural Rubber

The scope of this article is to study the sulphur vulcanisation of natural rubber in the presence as accelerator of N cyclohexyl 2 benzothiazyl sulfenamide (CBS). Two series of compounds were prepared with conventional and efficient cured systems. Experimental results indicates that abstraction of allylic hydrogen and addition to the double bonds can act as […] mehr...

2.Dezember 2005 - Neues aus der Forschung

Comparative Study

Technical Properties of Cardanol Grafted Natural Rubber and Oil Plasticized Natural Rubber

The plasticity and Mooney viscosity of Cardanol Grafted Natural Rubber (CGNR), synthesized by a solution grafting technique using a peroxide initiator, has been studied in details and compared with the one of aromatic oil plasticized natural rubber (OPNR). CGNR shows a higher plasticity and a lower Mooney Viscosity as compared to raw NR. A comparison […] mehr...

2.Dezember 2005 - Neues aus der Forschung

Kautschuke

Rheological Behavior of Blends of Natural Rubber and Hydrogenated Nitrile Rubber

The influence of dichlorocarbene modified natural rubber (DCNR) as a modifying agent on the rheological behavior of blends based on natural rubber (NR) and hydrogenated nitrile rubber (HNBR) was investigated. The binary blends of NR and HNBR showed a pseudoplastic flow behavior. The blends recorded a viscosity lower than both the constituents showing a behavior, […] mehr...

2.Dezember 2005 - Neues aus der Forschung

Kautschuke

FT-Rheology, a Tool to Quantify Long Chain Branching in Natural Rubber and its Effect on Mastication, Mixing Behaviour and Final Properties

Large Amplitude Oscillatory Shear on polymer melts at strain ratios between 2.5 and 10 provides variable stress signal distortion. The stresssignal distortion has been found to be sensitive only to the presence and level of long chain branching (LCB) and not to average molecular weight (AMW) and molecular weight distribution (MWD). Quantification of the signal […] mehr...

7.September 2005 - Neues aus der Forschung

Roh- & Zusatzstoffe

Evaluation of Physical and Electrical Properties of Chloroprene Rubber and Natural Rubber Blends

In the present study co-vulcanization of the blend containing CR and NR has been investigated both in gum and carbon black filled stocks. Significant improvements in the cure behavior of the stocks and the physical properties of the blend vulcanizates has been observed. Dielectric measurements were carried out and the variation of the dielectric properties […] mehr...

11.Mai 2005 - Neues aus der Forschung

Fachartikel

Structure and Origin of Long-Chain Branching and Gel in Natural Rubber

NMR studies have revealed the fundamental structure of natural rubber (NR) composed of the initiating terminal (w- terminal), two trans-1,4 isoprene units, a long sequence of cis-1,4 isoprene units and the chain-end group (a-terminal). The functional w- and a-terminal groups have been postulated to form branchpoints by association with proteins and phospholipids, respectively. The treatment […] mehr...

11.März 2005 - Neues aus der Forschung

Additive & Füllstoffe

Ageing Effect on Dynamic and Mechanical Properties of NR/Cel II Nanocomposites

The influence of ageing caused by heating on nanocomposites prepared by co-coagulation of natural rubber latex and Cel xanthate mixtures was studied in this work. For comparison purposes, carbon black natural rubber vulcanizates were also prepared. The amount of Cel II (Cel II) varied from 0 to 30 phr, while carbon black from 0 to […] mehr...

14.September 2004 - Neues aus der Forschung

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