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• W2163359105 abstract "Abstract The degradation behavior of semicrystalline PEO on silica (SiO 2 ) nanoparticles as a function of silanol density, hydrophobicity and nanoparticle size was investigated under N 2 purge by derivative thermogravimetric analysis (dTGA) for adsorption amounts at or below plateau adsorption. The PEO was adsorbed onto colloidal (Stober) onto 100 nm colloidal that had been heat-treated to vary the silanol density or hydrophobically modified, (CH 3 ) 3 –SiO 2 , and onto 15, 40 and 100 nm SiO 2 made by a water-glass process. Either one or two degradation peaks, T d , were observed for the adsorbed PEO, one at ∼180–210 °C and one at ∼250–300 °C. The degradation peak at 180–210 °C appeared either at high adsorption amounts for the 100 nm SiO 2 , on the 15 nm SiO 2 , and on hydrophobically modified SiO 2 , where PEO not directly hydrogen-bonded with SiOH was expected. The degradation peak at 250–300 °C correlated with SiOH density of the SiO 2 , and thus SiOH/C O contacts, and the peak position increased with increase in SiOH density. With decreasing adsorption amount for the 100 nm SiO 2 , the 180–210 °C peak decreased with respect to the 250–300 °C peak. Thus, the freer PEO segments appeared to degrade at lower temperatures than the H-bonded segments. However, both T d s were well below those observed for neat PEO, which occurs at ca 388 °C. This may arise since PEO is oxidatively unstable, and the volatile degradation products of the relatively small number of PEO chains on the high surface area SiO 2 are removed quickly, resulting in more rapid degradation." @default.
• W2163359105 created "2016-06-24" @default.
• W2163359105 creator A5024266536 @default.
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• W2163359105 date "2011-08-01" @default.
• W2163359105 modified "2023-09-26" @default.
• W2163359105 title "Thermal degradation of PEO on SiO2 nanoparticles as a function of SiO2 silanol density, hydrophobicity and size" @default.
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• W2163359105 doi "https://doi.org/10.1016/j.tca.2011.05.022" @default.
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