The Viscoelastic Behavior of Polymer/Oligomer Blends

Wei Zheng, Gregory McKenna, Sindee Simon

Research output: Contribution to journalArticlepeer-review


The viscoelastic properties of poly(alpha-methyl styrene), its hexamer, and their athermal blends at various concentrations are studied. Master curves for the dynamic shear responses, G' and G '', are successfully constructed for both the pure materials and the blends, indicating the validity of the time temperature superposition principle for these systems. The temperature dependence of the shift factor follows the Vogel-Fulcher behavior over the temperature range studied, and the temperature dependence is slightly weaker for the blends. The rubbery plateau modulus scales with the polymer concentration as G(N)(0)proportional to phi(2.04+/-032); the terminal relaxation time scales with the polymer concentration as tau(d) proportional to phi(1.35+/-0.33). The shape of the segmental dispersion appears unchanged by concentration, which differs from our calorimetric studies where mixtures show obviously temperature-broadened glass transitions and depressed enthalpy overshoots. The TNM (To
Original languageEnglish
Pages (from-to)4899 - 4906
StatePublished - 2010


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