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Rheological modeling of the linear viscoelastic behavior of maltenes mixed with styrene–butadiene–styrene (SBS) block copolymer
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Rheological modeling of the linear viscoelastic behavior of maltenes mixed with styrene–butadiene–styrene (SBS) block copolymer
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Journal Article
Rheological modeling of the linear viscoelastic behavior of maltenes mixed with styrene–butadiene–styrene (SBS) block copolymer
2024
Overview
An analysis and modeling of the linear viscoelastic behavior of maltenes (M) blended with styrene–butadiene–styrene block copolymer (SBS) are presented in this study. M were mixed with different amounts of SBS (Elastomer,
E
) (0.25–80 wt%) to investigate the effect of polymer concentration on linear viscoelastic response of the blends; storage and loss moduli were obtained from small amplitude oscillatory shear tests (SAOS). Time–temperature superposition master curves were analyzed by a Maxwell multi-modal model with up to nine relaxation times. Han, Cole–Cole and Van Gurp-Palmen diagrams were prepared from the rheological data. Two different responses were observed: At low E contents, a dispersed system rheological response was observed and verified by microscopy with elastomer as the dispersed phase and maltenes as the matrix, while at high E content the response was that of a co-continuous system. Mixtures with
E
> 2 wt% exhibited change in their thermomechanical properties with a phase inversion at
E
> 50 wt%. Furthermore, at low
E
concentration resins stabilize the dispersed phase by diminishing the magnitude of the viscoelastic moduli, conversely, at high
E
concentration a swelled polymer-rich phase creates a network that significantly influences of the viscoelastic properties.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
