Abstract
A finite element method was extended and applied to a microphase-separated poly(styrene-b-butadiene-b-4-vinylpyridine) (SBP) three-block polymer for analysis of temperature dispersion of dynamic viscoelastic response under a small-amplitude sinusoidal oscillation. The application of this method to a multiphase viscoelastic system requires a knowledge of the typical relaxation spectrum of an amorphous polymer and the temperatures of the onset of glass transitions of the constituent homopolymers as well as the morphology of the system. Two typical morphologies were examined. One was a “ball-in-a-box” structure in which a poly(4-vinylpyridine) (P) ball sits in a polystyrene (S) box stuffed the gap with polybutadiene (B) blocks, and the other a “three-layer-lamellar” morphology in which three phases alternate in the manner …SBP·PBS·SBP… In the temperature dispersion of the moduli, the former shows only two transitions due to the glass transitions of B and S phases, while the latter shows three transitions due to those of all three phases. The finite-element-method analysis discribes well or at least semiquantitatively the features of such three phase systems having particular morphologies.
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Watanabe, H., Kotaka, T. Analysis of Linear Viscoelastic Behavior of Microphase-Separated ABC Three-Block Polymer Systems by Finite-Element Method. Polym J 13, 149–158 (1981). https://doi.org/10.1295/polymj.13.149
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DOI: https://doi.org/10.1295/polymj.13.149