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  • 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 ML(1+4) 100 °C and stress relaxation by constant k and exponent M=k(t)a give similar information about natural rubber quality as Mooney viscosity ML(1+4) 100 °C, because both values and highly correlated. Exponent a in equation M 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 papar, elastic energy retnetion exponent (a+1) is positive, its values are decreasing with decreasing material elasticity, and for common characterization in rubber technology is therefore more practical to use (a+1) than exponent a. Thus, by measurement on Mooney viscometer can be natural rubber procesability chracterized not only by Mooney viscosity ML(1+4) 100 °C, but also by Mooney elasticity (a+1).
  • 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 ML(1+4) 100 °C and stress relaxation by constant k and exponent M=k(t)a give similar information about natural rubber quality as Mooney viscosity ML(1+4) 100 °C, because both values and highly correlated. Exponent a in equation M 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 papar, elastic energy retnetion exponent (a+1) is positive, its values are decreasing with decreasing material elasticity, and for common characterization in rubber technology is therefore more practical to use (a+1) than exponent a. Thus, by measurement on Mooney viscometer can be natural rubber procesability chracterized not only by Mooney viscosity ML(1+4) 100 °C, but also by Mooney elasticity (a+1). (en)
Title
  • Mooney viscosity, Mooney elasticity and procesability of raw natural rubber
  • Mooney viscosity, Mooney elasticity and procesability of raw natural rubber (en)
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  • Mooney viscosity, Mooney elasticity and procesability of raw natural rubber
  • Mooney viscosity, Mooney elasticity and procesability of raw natural rubber (en)
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  • RIV/70883521:28610/11:43867496!RIV12-MSM-28610___
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  • RIV/70883521:28610/11:43867496
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  • rubber processability, Mooney viscometer, viscosity, elasticity, natural rubber (en)
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  • Journal of Material Science and Engineering with Advanced Technology
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  • Maláč, Jiří
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  • 0976-1446
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  • 28610
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