Thermal properties and morphology characteristics of a PP mono-filament and its foam / N. Chuapon in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 5 (11/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 5 (11/2014) . - p. 579-587 Titre : Thermal properties and morphology characteristics of a PP mono-filament and its foam Type de document : texte imprimé Auteurs : N. Chuapon, Auteur ; O. Naithamon, Auteur ; Y. Sato, Auteur ; S. Areerat, Auteur ; Hiroshi Ito, Auteur Année de publication : 2014 Article en page(s) : p. 579-587 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Propriétés thermiques Monofilaments Morphologie (matériaux) Mousses plastiques Polypropylène Structure cristalline (solide) Index. décimale : 668.9 Polymères Résumé : The polypropylene (PP) mono-filament is an alternative material that can be used for insulation, packaging, and polymer composite applications. In this study, PP mono-filaments were prepared by extrusion free-fall at temperatures of 190, 200, and 210°C through a micro extrusion die with a diameter of 900??m. The free-fall speeds of the filament were controlled by a gear pump driving at speeds ranging from 12.5 to 20.0?min?1, and the extrudates were cooled at room temperature. The PP mono-filaments were subsequently foamed by a batch foaming process with sc-CO2 as the blowing agent at foaming temperatures of 165, 170, 175 and 180°C. The thermal properties and crystallinity of the prepared filaments and their foams were investigated using a DSC. The foam morphology and isotropic foam properties were characterized by SEM micrographs. The results show that the various morphologies of the PP mono-filament foams deviated from the isotropic foam behavior and had isotropic foam index values in the range of 1.1 to 2.3. In addition, the PP mono-filament that was foamed at 175°C expanded in the longitudinal direction and exhibited the highest expansion ratio, but its degree of crystallinity decreased compared to the mono-filaments. PP mono-filament foam represented a narrow crystallization temperature range and crystallization time than mono-filament and tended to a faster crystalline growth. DOI : 10.3139/217.2920 En ligne : https://drive.google.com/file/d/1457bKcafdihSgQ13yCVwGTbw2fqkDFjh/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22223 [article]

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X-ray photoelectron spectroscopy analysis of mono alkyl phosphate-oriented states in leather surface / K. Sato in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 84, N° 3 (05-06/2000)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 84, N° 3 (05-06/2000) . - p. 138-143 Titre : X-ray photoelectron spectroscopy analysis of mono alkyl phosphate-oriented states in leather surface Type de document : texte imprimé Auteurs : K. Sato, Auteur ; Y. Sato, Auteur Année de publication : 2000 Article en page(s) : p. 138-143 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir Hydrophobie Phosphate de monoalkyle Spectroscopie des rayons X Sulfate de monoalkyle Surfaces -- Analyse Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather fatliquored with monoakyl phosphate (MAP) possessed an excellent hydrophobicity. In order to elucidate the mechanism of the hydrophobicity due to MAP fatliquoring the binding behaviour and orientation of the MAP molecule (with different alkyl chain lengths) on the surface of chrome leather were examined by X-ray photoelectron spectroscopy (XPS). Differences in the behaviour of MAP and mono alkyl sulphonate (MAS) were also studied by XPS. The interactions of MAP or MAS with the chrome leather are different. MAP combined with the chrome leather with a co-ordination bond and MAS combined chiefly with an ionic bond. The binding strength of MAP varied with the carbon number. The MAP molecule stayed on the fibre surface and a monolayer of MAP molecules was formed. The alkyl chain with C16 or above showed a high condensation force between the side planes and formed a condensed membrane with high density. It can be considered that the hydrophobicity results from the formation of a monolayer of MAP molecules into a condensed membrane. Note de contenu : - EXPERIMENTAL METHODS : Materials - XPS measurement - Angle dependence - EXPERIMENTAL RESULT AND CONSIDERATION : Interaction between MAP and chrome leather - The orientation of MAP in the leather surface - Table 1 : The composition of alkyl phosphate products determined by gas-chromatography En ligne : https://drive.google.com/file/d/1mySolBUcmg7Z0vfMPjmfxesl1HlWtMi9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41236 [article]

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