β Scribed by Helene Gauthier; Anne-Cecile Coupas; Pascal Villemagne; Robert Gauthier
No coin nor oath required. For personal study only.
Partial esterification of cellulose using acyl chlorides having 5 and 16 carbon atoms was performed in a swelling medium to produce cellulosic esters with two different degrees of substitution (DS Γ 0.15 and 0.45). The effects of this treatment on the surface energy, on the water uptake, and on the acido-basic character of the cellulose were studied by inverse gas chromatography and thermogravimetric analysis. The attaching of alkyl chains to the surface of cellulose reduces its acidic character and its hydrophilicity and the DS required for such an effect depends on the chain length.
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Three polypyrrole-silica nanocomposites were characterized by inverse gas chromatography (IGC) at 60 and 80degreesC using both linear and branched alkane probes. The IGC data for these materials were compared with those obtained for the ultrafine silica sol and polypyrrole (PPy) bulk powder referenc
The inverse gas chromatography (IGC) technique has been employed to examine adsorption behavior of cellulose surfaces from elution characteristics of chemically different adsorbates. The neutral probes were eluted completely during IGC measurements while acidic, amphoteric, and basic probe molecules
## rate of release of volatile surface thermal decomposition The influence of heat treatment on the surface properties of products. ## hematite samples of different origins was examined by inverse gas Information on the surface properties, especially the surchromatography (IGC) and temperature