Phase behavior and polymer dynamics of polymer-grafted nanoparticles
발표자
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초록
내용
Despite extensive studies on the mechanical properties and thermal stability of polymer-grafted nanoparticles (PGNPs), up to date only little is known about the phase behaviors of miscible or immiscible binary PGNPs blends. Here, the spatial distribution of binary PGNPs blends was observed for the combination of deuterated PS-grafted silica (dPS-SiO2) NPs with (i) hydrogenated PS-grafted silica (hPS-SiO2) and (ii) hydrogenated PMMA-grafted silica (hPMMA-SiO2) NPs with various molecular weight and grafting density, as well as (iii) hydrogenated linear PMMA (hPMMA). For immiscible blends of PGNPSs (dPS-SiO2/hPMMA-SiO2), the uniform distribution of the individual particle constituents was found in contrast to the phase separation of the corresponding linear polymer blends (i.e., dPS/hPMMA), indicating a crucial role of the polymer brushes in their dynamics and the relevant phase behavior.