Miscibility and Viscoelastic Properties of Acrylic Polyhedral OligomericSilsesqui oxane-Poly(methyl methacrylate) Blends (Postprint)

摘要

Blends of poly(methyl methacrylate) (PMMA) with two acrylic polyhedral oligomeric silsesquioxanes (POSS) were analyzed to determine the effect of well-dispersed POSS nanoparticles on the thermo-mechanical properties of PMMA. Differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and melt rheology all showed that the dispersed POSS behaved like a plasticizer. Differential scanning calorimetry (DSC) showed a larger drop in the glass transition temperature T(g) in the blends containing unmodified acrylic-POSS when compared with hydrogenated acrylic-POSS blends at the same loading. This difference in the degree of T(g) plasticization was directly related to the degree of miscibility of the POSS and PMMA.