Determination of Optimized Blending Fractions for Particle-Size Distributions or Molecular-Weight Distributions Involving Various Physical-Properties

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Polymers and High Performance Materials


It has been shown in this study that the effects of particle size distribution or molecular weight distribution on selected physical properties can be related by a generalized blending approach that involves similar equations. The blending equations developed involve different z-fractions where z = 3 for volume blending of spherical particles, z = 2 for surface blending of spherical particles, or z = 1 for the weight blending of molecular weights. This new analysis approach addresses the magnitude of the ratios of particle size averages, D-x/D-y, or ratios of molecular weight averages, M(x)/M(y), as well as the location of this maximum, the level of distribution information available for the starting materials, and the type of z-fraction blending. To illustrate this approach suspension viscosity/concentration data was used to show how the D-x/D-y ratio could be introduced successfully to analyze latex volume blending where z = 3. In addition, the maximum steady-state elastic compliance, J(e), as a function of weighted blends (z = 1) of two different molecular weights of polyisobutylene was shown to fit the simple equation J(e) = 1.187 (M(3)/M(2))(M(4)/M(1)) reasonably well. (C) 1995 John Wiley & Sons, Inc.

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Journal of Polymer Science Part B: Polymer Physics





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