Strength of rubbers

It has long been recognized that the strength of a rubber may be increased by  

incorporation of finely divided fillers, in particular carbon blacks. 

Hence unfilled SBR compounds are much weaker than corresponding vulcanizates from natural rubber but both are considerably strengthened (reinforced) by the incorporation of carbon black (Table 4.7). 

EFFECT OF REINFORCEMENT ON MECHANICAL PROPERTIES OF AMORPHOUS AND CRYSTALLIZABLE VULCANIZATES 

G-BUTADIENE VinYLPYRIDINE -aUTADFENe-ACRY LON FTRILE A -6U TADIE he -MONOCJiLOftOST YftE NE A- auTAoiEs E- dk m LDROSTYAENE 7-aUTYL T -NEOPRENE ON 

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Relation between the Strength of Rubber and Its Molecular Structure.8... 

RELATION BETWEEN THE STRENGTH OF RUBBER AND ITS MOLECULAR STRUCTURE... 

H.W. Greensmith, L. Mullins, and A.G. Thomas, Strength of rubbers, Chap.lO in The Chemistry and Physics of Rubber-Like Substances, ed. by L. Bateman, Wiley, New York, 1963. 

Equation 18.2 reveals the importance of energy dissipation in the fracmre of mbbery materials, that is, the strength of rubbers, whether filled or unfilled, is governed by the hysteresis energy dissipated in deforming the system. 

G. Cigna, S. Matarrese, and G.F. Biglione, Effect of structure on impact strength of rubber-reinforced polystyrene,. Appl. Polym. Sci., 20(8) ... 

The tinting strength of rubber-grade carbon blacks shows a linear relationship with D s shown in Figure 5. Since performance characteristics are known to depend on aggregate volume, surface area, and bulkiness, it appears that the D s values combine the effects of all these factors. As such, it is a valuable addition to carbon black characterization methodology. 

Wear resistance and tensile strength of rubbers and polymers are increased by the introduction of silica in the organic network. In order to preserve these improved qualities in wet conditions, however, the silica surface has to be modified to assure interfacial bonding.32... 

Amount of Rubber. Generally the impact strength of rubber-modified plastics increases with an increase in rubber content. Although the impact improves, it is usually at the sacrifice of other properties such as strength, modulus, heat distortion, weather resistance, and creep. 

FIGURE 1.9 Dependence of compressive strength of rubber polymer concrete (RubCon) samples on exposition time at humidity of environment 1 50%-60%, 2 85%-95%, 3 water immersion, (From Yu. Borisov, Yu. Potapov, O. Figovsky, and D. Beilin, Water Resistance of the Polymer ConcretesJ. Scientific Israel Advanced Technology 14, no. 3 (2012) 84-91. With permission.)... 

The degree of dispersion of compounding ingredients influenced the strength of rubber, apparently by a flaw-initiation mechanism [293]. 

Fig. 8. Peel strength of rubber-glass bonds variation with shrinkage strain (from ref. 18).

Figure 9.8 Loss of tensile strength of rubber composites during soil burial test.

Figure 13.24 represents the influence of cofibre on the tensile strength of rubber composites. Results showed that the tensile strength of rubber blend... 

Strength of rubber can be increased by adding a rigid plastic. 

Fig. 189. Fatigue strength of rubbers made from SKS-30A after the introduction of various additives, a) At 20 b) at 100 C. I) 10 parts by weight of the additive II) three parts by weight III) one part by weight IV) 0.3 parts by weight V) without additives. 1) Benzoyl peroxide 2) dihydroxydiphenyl sulfide 3) azoisobutyrodinitrile 4) di-tert-butylhydroquinone 5) tri-tert-butylphenol 6) polyethylene-polyamine 7) diproxide 8) santovar 0 9) chlorinated paraffin 10) benzoquinone 11) hydroquinone 12) quinhydrone 13) acetoneanil ...

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