ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The dependence of viscoelastic properties on the molecular weight of fractionated and and blended petroleum pitches was examined in relation to the creep and glass transition behaviour. The steady-state viscosity,η, as a measure of energy dissipation, and the steady-state creep compliance,J e 0 , as a measure of elastic stored energy, were empirically related to the glass transition point,T g. The values ofη showed a steep dependence on the number average molecular weight,¯M n (ηf ¯M n 42 ). It was proved that the molecular weight dependence ofη andJ e 0 manifest through the dependence ofT g on¯M n (T gf 1/¯M n). Discussion of the blending laws to elucidate the effect of molecular weight distribution has revealed that Inη,J e 0 , andT g are expressed additively by using the mole fraction of each pitch component with different molecular weights.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00550822
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