Effect of vinyl content on the viscoelastic properties of polybutadienes and polyisoprenes — monomeric friction coefficient

This study is devoted to experimental research of rubber friction in sliding contact with rough surface. Influence of pressure, bulk temperature and sliding velocity on friction coefficient in dry conditions is analysed for two rubber compounds with different viscoelastic properties. Grosch method of master curves construction is used for analysing of friction measurements. Such analysis is performed for different temperatures and velocities at constant normal load. The obtained friction master curves are combined into a single friction map. The friction maps demonstrate the influence of viscoelastic properties of rubber on friction coefficient in dry rough contact. Also friction maps show the influence of adhesion and hysteresis contributions into friction coefficient for different rubber compounds.

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Effect of the Reference Chain Dimensions in the Molecular Theory of Viscoelastic Behavior of Polymer Networks

Rubber Chemistry and Technology ◽

10.5254/1.3545004 ◽

1973 ◽

Vol 46 (1) ◽

pp. 127-138

Author(s):

M. Ilavský ◽

J. Hasa ◽

I. Havlíček

Keyword(s):

Friction Coefficient ◽

Temperature Dependence ◽

Network Formation ◽

Polymer Networks ◽

Viscoelastic Behavior ◽

Molecular Theory ◽

Strain Effect ◽

Equilibrium Behavior ◽

Monomeric Friction Coefficient ◽

External Strain

Abstract Mooney's version of the molecular theory of polymer networks has been generalized to the case when the external strain applied in the isotropic state is different from that at network formation. As in the theory of equilibrium behavior of the polymer networks, this generalization allows inclusion in the viscoelastic functions of effects connected with the temperature dependence of internal energy of the chains and with the strain effect of the solvent. From viscoelastic functions thus generalized, it is possible to derive a relation for calculation of the monomeric friction coefficient. It also suggests the possibility of superposing data obtained at various temperatures, degrees of swelling, and condition of network formation.

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Influence of the cure level on the monomeric friction coefficient of natural rubber vulcanizates

Polymer International ◽

10.1002/pi.1378 ◽

2004 ◽

Vol 53 (6) ◽

pp. 646-655 ◽

Cited By ~ 10

Author(s):

Angel J Marzocca ◽

Carlos A Steren ◽

Roxana B Raimondo ◽

Silvina Cerveny

Keyword(s):

Friction Coefficient ◽

Natural Rubber ◽

Natural Rubber Vulcanizates ◽

Monomeric Friction Coefficient

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Effects of Viscoelastic Properties of Friction Lining Materials on Their Friction Coefficients

Journal of Tribology ◽

10.1115/1.4034380 ◽

2016 ◽

Vol 139 (3) ◽

Cited By ~ 3

Author(s):

Kai Chen ◽

Dekun Zhang ◽

Xiaojia Zhang

Keyword(s):

Friction Coefficient ◽

Stress Relaxation ◽

Tribological Properties ◽

Viscoelastic Properties ◽

Loss Factor ◽

High Load ◽

Friction Coefficients ◽

Creep And Stress Relaxation ◽

Friction Lining

In order to obtain the viscoelastic properties of friction linings and their effect on the tribological properties, three friction linings (K25, G30, and GM-3) are studied. Results show that higher creep and stress relaxation performances are favorable for promoting the friction coefficient. The friction coefficient of GM-3 is inversely proportional to the load. Meanwhile, the friction coefficients of K25 and G30 first increase to the peak under the load and later decrease. Under high load, GM-3 has the largest friction coefficient, whereas K25 has the smallest, with that of G30 being the median. The friction coefficient of GM-3 is inversely proportional to the loss factor, whereas those of K25 and G30 are directly proportional.

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