Journal of Materials Science and Engineering with Advanced TechnologyAuthor's: Jiří Maláč
Pages: [67] - [87]
Received Date: November 4, 2010
Submitted by:
Recently measured Mooney viscosity and Mooney relaxation data of
different raw natural rubber grades were used to discuss the meaning
of obtained results. Viscosity was characterized as 
and stress relaxation by constant k
and exponent a in power law model 
The constant k in equation 
give similar information about natural
rubber quality as Mooney viscosity 
because both values are highly correlated.
Exponent a in equation characterizes elastic response of raw
natural rubbers, but negative values of exponent a from Mooney
relaxation measurements impede its common utilization for
characterization of material elasticity in rubber technology. As it is
shown in this paper, elastic energy retention exponent 
is positive, its values are decreasing with
decreasing material elasticity, and for common characterization in
rubber technology is therefore more practical to use than exponent a. Thus, by measurement
on Mooney viscometer can be natural rubber procesability
characterized not only by Mooney viscosity but also by Mooney elasticity .
rubber procesability, Mooney viscometer, viscosity, elasticity, natural rubber.
