Experimental study on multiaxial ratcheting behavior of vulcanized natural rubber

2009 ◽  
Vol 49 (3) ◽  
pp. 506-513 ◽  
Author(s):  
Yanping Wang ◽  
Xu Chen ◽  
Weiwei Yu ◽  
Lei Yan
Keyword(s):  
Experimental Study ◽  
Natural Rubber

The Attack of Ozone on Stretched Rubber Vulcanizates. II. Conditions for Cut Growth

1960 ◽  
Vol 33 (4) ◽  
pp. 1156-1165
Author(s):  
M. Braden ◽  
A. N. Gent
Keyword(s):  
Experimental Study ◽  
Tensile Stress ◽  
Natural Rubber ◽  
Critical Value ◽  
Rubber Sheet ◽  
Test Pieces ◽  
Rubber Vulcanizate ◽  
Present Part ◽  
Applied Tensile Stress ◽  
Made In

Abstract In Part I an experimental study was reported of the factors determining the rate of propagation of a cut through a stretched rubber sheet under the action of an atmosphere containing ozone. It was remarked that no growth took place from a small razor cut made in one edge of the test pieces unless a critical value of the applied tensile stress was exceeded. The value was quite small, of the order of 100 g/cm2 for a soft natural rubber vulcanizate. In the present part an examination is reported of the conditions necessary for a crack to form or, being present, to grow.

Relaxation Processes in Vulcanized Rubber. II. Secondary Relaxation Due to Network Breakdown

1963 ◽  
Vol 36 (2) ◽  
pp. 389-398 ◽  
Author(s):  
A. N. Gent
Keyword(s):  
Molecular Structure ◽  
Experimental Study ◽  
Natural Rubber ◽  
Relaxation Process ◽  
Relaxation Processes ◽  
Secondary Relaxation ◽  
Oxidative Deterioration ◽  
Vulcanized Rubber ◽  
Oxidation Inhibitors ◽  
Natural Rubber Vulcanizates

Abstract An experimental study is described of a “secondary” relaxation process in stretched vulcanizates, which becomes dominant after long periods at normal temperatures. It is shown to be affected markedly by the temperature, the atmosphere in which the test is conducted, and the presence of oxidation inhibitors. It is therefore attributed to oxidative deterioration of the molecular structure. In some vulcanizates, however, a similar or even greater relaxation is found to occur in vacuo, and this is attributed to the failure of specific crosslink structures. The extent of recovery on releasing the extended testpieces has also been investigated for a number of natural rubber vulcanizates.

Experimental Study on Thermal Conductivity Property of Rubber Composites Filled with Carbon Nanotubes

2011 ◽  
Vol 221 ◽  
pp. 373-376 ◽  
Author(s):  
Ze Peng Wang ◽  
Yan He
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Experimental Study ◽  
Carbon Black ◽  
Natural Rubber ◽  
Rubber Composites ◽  
Conductivity Property

Thermal conductivity of rubber composites filled with CNTs (carbon nanotubes) and N234 CB (carbon black) were investigated. Result indicated that Thermal conductivity of NR (natural rubber) filled with CNTs is higher than that of NR filled with CB in the case of the same filling amount. CNTs can better improve the performance of thermal conduct of rubber composites than CB. The more the filling content of CNTs is, the higher thermal conductivity of NR composites.

Damage evolution in natural rubber: An experimental study

2020 ◽  
Vol 137 ◽  
pp. 103850
Author(s):  
Srinivasan Echchur Rangarajan ◽  
Krishna Kumar Ramarathnam
Keyword(s):  
Experimental Study ◽  
Natural Rubber ◽  
Damage Evolution

The Preparation of Cyclized Rubber from Natural-Rubber Latex

1951 ◽  
Vol 24 (1) ◽  
pp. 195-196
Author(s):  
G. J. van Veersen
Keyword(s):  
Experimental Study ◽  
Sulfuric Acid ◽  
Natural Rubber ◽  
Hydrogen Chloride ◽  
Hydrogen Fluoride ◽  
Natural Rubber Latex ◽  
Rubber Latex ◽  
Boron Fluoride ◽  
Surface Active Agents ◽  
Surface Active

Abstract The hydrochlorination of rubber in the form of latex which has been stabilized by surface-active agents, such as Emulphor-O, or by cationic agents such as Fixanol, shows that hydrogen chloride molecules diffuse very easily into the latex globules. Accordingly it was to be expected that, by replacing hydrogen chloride gas by hydrogen fluoride gas, which is a cyclizing agent of rubber, a cyclized rubber would be obtained. This line of reasoning was confirmed experimentally. As a result of an experimental study, it was proved that boron fluoride, BF8 also, brings about cyclization of rubber in latex, and van Amerongen has already shown that sulfuric acid likewise can be used as a catalyst. Since sulfuric acid is much easier to handle than either hydrogen fluoride or boron fluoride, it was used in most of the experiments in the present work.

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