AI Article Synopsis
- The study focused on the molecular mobility during the glass transition of poly(vinyl acetate) (PVAc) and poly(ethylene-co-vinyl acetate) (EVA) by analyzing how temperature and pressure affect intermolecular interactions.
- Researchers used time-temperature-pressure superpositions and relaxation time dispersion to assess the impact of the vinyl acetate (VAc) ratio on molecular interactions and cooperative behavior.
- Results showed that the thermal and volumetric contributions to isobaric fragility vary based on the VAc ratio and pressure, highlighting the significant role of the dipolar pendant groups in these interactions.
Article Abstract
In this work, the molecular mobility at the glass transition of poly(vinyl acetate) (PVAc) and poly(ethylene-co-vinyl acetate) (EVA) amorphous sample series was investigated. The temperature and pressure dependences of the intermolecular interactions were studied from time-temperature-pressure superpositions and from the relaxation time dispersion of the segmental relaxation. The difference in terms of intermolecular interactions due to the lateral group ratio of vinyl acetate (VAc) was then estimated from the activation volume and related to the cooperative behavior. The isobaric fragility and its two contributions (thermal and volumetric) were estimated through high pressure broadband dielectric spectroscopy measurements. The volumetric and thermal contributions show different behaviors as a function of the VAc ratio and as a function of the pressure. Thus, the study of the PVAc/EVA series has allowed us to emphasize that the intramolecular and intermolecular interactions induced by the dipolar pendant groups directly influence the thermal and volumetric contributions to the isobaric fragility.
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| http://dx.doi.org/10.1063/5.0233715 | DOI Listing |
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