Download Melt Rheology and its Applications in the Plastics Industry by John M Dealy, Jian Wang PDF
By John M Dealy, Jian Wang
This is the second one version of Melt Rheology and its function in Plastics Processing, even supposing the name has replaced to mirror its broadened scope. Advances within the fresh years in rheometer know-how and polymer technology have significantly greater the usefulness of rheology within the plastics undefined. it's now attainable to layout polymers having particular molecular constructions and to foretell the move homes of melts having these buildings. additionally, rheological houses now offer extra designated information regarding molecular structure.
This publication offers all of the details that's wanted for the clever program of rheology within the improvement of latest polymers, the decision of molecular constitution and the correlation of processability with laboratory attempt facts. conception and equations are constrained to what's crucial for using rheology within the characterization of polymers, the advance of latest plastics fabrics and the prediction of plastics processing habit. The emphasis is on details that might be of direct use to practitioners. huge references are supplied for these wishing to pursue sure matters in higher intensity.
While the first viewers is utilized polymer scientists and plastics engineers, the publication can be of use to postgraduate scholars in polymer technological know-how and engineering and as a textual content for a graduate course.
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Extra resources for Melt Rheology and its Applications in the Plastics Industry
Sample text
Values of MC for a number of polymers are given in Appendix A. This is not to be confused with two other rheologically meaningful critical molecular weights M0 C and Me, which will be introduced later. 34 2 Viscosity and Normal Stress Differences For polydisperse materials, it is found that Eq. e. those with M \ MC. g0 ¼ KMwa ð2:21Þ This relationship leads directly to a blending law for viscosity. For example, in a binary blend of two monodisperse samples of the same polymer having molecular weights M1 and M2, the weight-average molecular weight of the blend is given by: Mwb ¼ w1 M1 þ w2 M2 ð2:22Þ where w1, and w2, are the weight fractions of the blend components.
By use of this procedure, the range of reduced shear rate range over which a master curve can be prepared is broader than the range of shear rates over which measurements can be made. For a polymer well above its glass transition temperature, it is often found that the zero-shear viscosity obeys the well-known Arrhenius relationship shown by Eq. 15). ! Ea 1 1 À g0 ðTÞ ¼ g0 ðT0 Þ exp ð2:15Þ R T T0 30 2 Viscosity and Normal Stress Differences The constant Ea is called the activation energy for flow.
The picture is more complicated in the case of asymmetric stars. Gell et al. [30] studied a series of asymmetric stars made by adding arms of varying length at the midpoint of a very long backbone (M/Me & 40). They found that even a short arm Fig. 17 Zero-shear viscosity at 379 °C versus Mw for polybutadienes having various structures: linear (circles), three-arm stars (squares), four-arm stars (trangles). At low Mw branched systems fall below the line for linear molecules, and at higher Mw their values rise above the line and approach an exponential behavior.