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- W2058040631 abstract "Abstract A systematic rheological method is suggested to study the kinetics of concentration fluctuation during phase separation. It is based on the idea that the storage modulus of a phase separating polymer blend is composed of modulus due to the growing domains (interfacial contribution) and due to the thermally induced local composition fluctuations inside the domains (components' contribution). The two part contributions to the blend modulus varied with frequency. A crossover frequency was determined, below and above which the elastic modulus is dominated by the interfacial contribution and by the components' contribution, respectively. At frequency much above the crossover frequency, the variation of storage modulus is due to the change of local compositions, which can be calculated according to the relationship between the blend composition and the dynamic modulus in miscible state. In addition, the steady state values of local compositions can be considered as the thermodynamic equilibrium compositions at the annealed temperature, which help us to construct phase diagram. Moreover, the interfacial contribution at frequency lower than the crossover frequency could be isolated by subtracting the components' contribution from the blend's modulus. The characteristic length of domains were got through YZZ model with the equilibrium interfacial tension, which is comparable to the results from transmission electron microscopy (TEM). Furthermore, from the evolution of local compositions and the growth way of the characteristic length of domains, the crossover time from the intermediate stage to the late stage of spinodal decomposition can be specified. This method is tested on poly (methyl methacrylate)/poly (styrene-co-acrylonitrile) (PMMA/SAN) blend, and would be applicable in other polymer blends with viscoelastic asymmetry." @default.
- W2058040631 created "2016-06-24" @default.
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- W2058040631 date "2015-06-01" @default.
- W2058040631 modified "2023-10-16" @default.
- W2058040631 title "Evolution of concentration fluctuation during phase separation in polymer blends with viscoelastic asymmetry" @default.
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- W2058040631 doi "https://doi.org/10.1016/j.polymer.2015.04.052" @default.
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