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11.
The functionalization of polypropylene (PP) with a maleinized hyperbranched polyester polyol (MHBP) was performed in solution to obtain PP-g-MHBPs. The degree of functionalization (FD) increased with MHBP and dicumyl peroxide (DCP) contents, but the contact angle followed an opposite behavior. The sample obtained with the proportion of 9.0 wt % MHBP and 2.0 wt % DCP and presented the highest FD value. An FD value of 2.4 wt %, produced a reduction of 19° on the contact angle. It was observed by differential scanning calorimetry (DSC) that the PP-g-MHBPs obtained by employing 3.0 wt % of MHBP, exhibited a slight reduction of the melting temperature (Tm) with the increase in the amounts of FD and DCP. Some FD values obtained in this study are higher than those obtained both commercial and noncommercial grades of PP functionalized with maleic anhydride. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 46932. 相似文献
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S C Nova Derivi M H Marques Mendez M C Rezende Rodrígues M Leonor Fernandes 《Archivos latinoamericanos de nutrición》1988,38(4):965-978
The purpose of the present study was to estimate dietary fiber components in raw vegetables and processed by different methods. Samples of 8 raw, 15 boiled, 5 fermented, 5 fried and 2 canned vegetables were analyzed. Results indicated the sample vegetables after being boiled, canned, fermented and fried, presented alterations in the dietary fiber insoluble and soluble components, e.i., by interaction or solubility tending to an increase or decrease of its components. Results obtained in the dietary fiber components of processed vegetables, in the sample analyzed, presented variations among them with the different processing techniques. 相似文献
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Adriana Veloso MacielAldo Eloizo Job Wagner da Nova MusselWalter de Brito Vânya Márcia Duarte Pasa 《Biomass & bioenergy》2011,35(3):1121-1129
The paper presents a process of cellulose thermal degradation with bio-hydrogen generation and zinc nanostructures synthesis. Production of zinc nanowires and zinc nanoflowers was performed by a novel processes based on cellulose pyrolysis, volatiles reforming and direct reduction of ZnO. The bio-hydrogen generated in situ promoted the ZnO reduction with Zn nanostructures formation by vapor-solid (VS) route. The cellulose and cellulose/ZnO samples were characterized by thermal analyses (TG/DTG/DTA) and the gases evolved were analyzed by FTIR spectroscopy (TG/FTIR). The hydrogen was detected by TPR (Temperature Programmed Reaction) tests. The results showed that in the presence of ZnO the cellulose thermal degradation produced larger amounts of H2 when compared to pure cellulose. The process was also carried out in a tubular furnace with N2 atmosphere, at temperatures up to 900 °C, and different heating rates. The nanostructures growth was catalyst-free, without pressure reduction, at temperatures lower than those required in the carbothermal reduction of ZnO with fossil carbon. The nanostructures were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and transmission electron microscopy (TEM). The optical properties were investigated by photoluminescence (PL). One mechanism was presented in an attempt to explain the synthesis of zinc nanostructures that are crystalline, were obtained without significant re-oxidation and whose morphologies are dependent on the heating rates of the process. This route presents a potential use as an industrial process taking into account the simple operational conditions, the low costs of cellulose and the importance of bio-hydrogen and nanostructured zinc. 相似文献
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Isabella Nova Luca Lietti Pio Forzatti Francesca Frola Federica Prinetto Giovanna Ghiotti 《Topics in Catalysis》2009,52(13-20):1757-1761
The reduction by CO of NO x species stored over Pt–Ba/Al2O3 Lean NO x Trap systems is analysed in this work. The reaction mechanisms and pathways leading to N2 formation both under dry and wet conditions are investigated by complementary transient dynamic experiments and FTIR analyses. 相似文献
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Antonio Grossale Isabella Nova Enrico Tronconi Daniel Chatterjee Michel Weibel 《Topics in Catalysis》2009,52(13-20):1837-1841
The activity and the mechanism of the main reactions in the NO/NO2–NH3 SCR reacting system were comparatively investigated over a Fe- and a Cu-promoted commercial zeolite catalyst for the aftertreatment of Diesel exhausts. A dynamic micro-kinetic model in close agreement with all the details of the SCR catalytic chemistry was also developed. 相似文献
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Nicolas Nova Fabien Girardin Pierre Dillenbourg 《International journal of human-computer studies》2010,68(7):451-467
The importance of space and place in collaborative practices has been strengthened with the ubiquitous computing paradigm, which aims at the integration of computation in physical objects and places. New location-based applications allow users to know where other individuals are in the physical world. New collaborative applications engage users in geographically dispersed and mobile activities. However, there is still a lack of information concerning how mutual location-awareness (i.e. knowing partners’ whereabouts) might influence socio-cognitive processes involved in coordination. To address this issue, we conducted field experiments with a mobile and collaborative game, running on Tablet PCs, and compared two interfaces. On the first interface, groups received automatic updates from teammates’ whereabouts, while this automatic MLA tool was not provided by the second interface. In addition, all users could use their Tablet PCs to communicate by annotating the map. We found no differences between the two conditions with regard to the task performance. However, contrary to our expectations, players without automatic MLA had a better representation of their partners’ paths, wrote more messages and provided more elaborate explanations of their strategies. Additionally, automatic location-awareness undermined the coordination process, leading participants to be less articulate about their strategy. The paper discusses these results and the implications of such results. 相似文献
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A comparison between commercial and model WO3–V2O5/TiO2 and MoO3–V2O5/TiO2 SCR catalysts is considered in this study. The data indicate that WO3 and MoO3 behave as “structural” and “chemical” promoters for the catalysts. MoO3-based catalysts are more active but less selective than WO3–V2O5/TiO2 catalysts in the SCR reaction, although in the presence of water the catalytic performances of the investigated samples are
comparable.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献