Films of an architecturally modified poly(lactic acid) (PLA REx ) with three different types of fumed silica nanofillers (SiO 2 ) were processed through reactive extrusion-calendering in a pilot plant. The effects of the SiO 2 type on both the dispersion and the crystallization behavior under dynamic and isothermal conditions are investigated using transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). The mechanical properties are assessed by tensile testing. TEM micrographs showed that the improved chemical affinity of both surface-treated SiO 2 toward PLA REx end groups did not improve particle dispersion. DSC results revealed that untreated SiO 2 nucleated PLA REx more efficiently than both surface-modified silicas. The activation energy for the isothermal crystallization process, as determined by an Arrhenius method, suggests that addition of untreated SiO 2 enhances the crystallization rate of PLA REx . However, it seems that the tensile behavior remained unchanged whether silicas were added or not. V C 2017Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45367.

The electrical resistivity of near-stoichiometric crystalline V2O5 has been measured as a function of crystal orientation and oxygen partial pressure from 25° to 300°C. Conductivity is insensitive to ambient atmosphere. The activation energy for conduction is 0.20 eV. Molten V2O5, however, is sensitive to oxygen partial pressure. Its conductivity is proportional to Po2−⅙. Anomalously high electrical resistivity was observed for glassy V2O5 films.

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