Atomistic molecular dynamics in polyethylene oxide and polymethyl methacrylate blends having significantly different glass transition temperatures. (28th January 2022)

• Record Type: Journal Article
• Authors: Habasaki, Junko
• Other Names: Affatigato Mario guestEditor.; Duran Alicia guestEditor.
• Is Part Of: International journal of applied glass science. Volume 13:Number 3(2022)
• Page Start: 347
• Page End: 358
• Publication Date: 2022-01-28
• Subjects: Dynamic heterogeneity -- Glass transition -- Polymer blends -- Diffusion; Glass -- Periodicals; Glass manufacture -- Periodicals; 666.1
• DOI: 10.1111/ijag.16553
• Languages: English
• ISSNs: 2041-1286

Abstract

Abstract: The highly asymmetric polymer blends, polyethylene oxide and polymethyl methacrylate systems, having extraordinary different original glass transition temperature ( T g ) 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 T g1 and T g2, the high and low‐temperature T g 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 T g in polymer blends and their relation with dynamics.