Abstract
AbstractThe highly asymmetric polymer blends, polyethylene oxide and polymethyl methacrylate systems, having extraordinary different original glass transition temperature (Tg) values, have been examined by the fully atomistic molecular dynamics simulations. We have determined densities against temperatures after establishing the conditions of models to clarify the composition‐dependent behavior of the systems. The relations show the intermediate region in addition to the Tg1 and Tg2, the high and low‐temperature Tg values, respectively. The trend found in the polymer blends is reproduced well from the weighted sum of plots for both homopolymers by assuming the additivity of local volumes. The dynamics of the polymer blend exhibited similar behavior with ionic systems but with different time scales. These results open new understandings for the physical meanings of the Tg in polymer blends and their relation with dynamics.
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