Abstract
The physical/mechanical characteristics of the polymer/particle interphase region have been always considered to be dependent on the surface chemical structure of the nanoparticles and their interactions with the polymer chains. In addition, it is repeatedly reported that the interphase-related parameters (e. g., thickness, tensile modulus and strength, yield strength, thermal conductivity) can be considered constant under any process conditions. Accordingly, in this study, a comprehensive investigation was performed to define the effects of nanoparticles content, aggregation/agglomeration factor and type of the exerted driving force on the characteristics of the polymer/particle interphase region. To this end, different experimental/analytical approaches were adapted by which it was possible to precisely characterize the internal structure of PS/silica and PMMA/silica nanocomposite samples based on their thermal and mechanical properties. The mechanical characteristics were evaluated using a developed form of Zare’s model and in the case of thermal characteristics, two new analytical models were proposed based on equivalent box model (EBM). According to the results, it was revealed that the increment of the nanoparticle content increased the thermal conductivity of the interphase while decreased its thickness and yield strength. Moreover, it was found that the aggregation/agglomeration of nanoparticles had negative effects on the interphase thermal properties which were negligible at low contents.
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Sharifzadeh, E. Evaluating the dependency of polymer/particle interphase thickness to the nanoparticles content, aggregation/agglomeration factor and type of the exerted driving force. Iran Polym J 30, 1063–1072 (2021). https://doi.org/10.1007/s13726-021-00956-3
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DOI: https://doi.org/10.1007/s13726-021-00956-3