Effect of rubber reinforcement with filler on extrusion flow and extrudate swell / Hidenori Hirai in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 2 (2022)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 2 (2022) . - p. 226-235 Titre : Effect of rubber reinforcement with filler on extrusion flow and extrudate swell Type de document : texte imprimé Auteurs : Hidenori Hirai, Auteur ; Hideyuki Uematsu, Auteur ; Yuji Sakai, Auteur ; Shuichi Tanoue, Auteur Année de publication : 2022 Article en page(s) : p. 226-235 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caoutchouc styrène-butadiène Charges (matériaux) Dioxyde de titane Elastomères -- Extrusion Extrusion capillaire Mesure Rhéologie Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Viscoélasticité Index. décimale : 668.4 Plastiques, vinyles Résumé : The extrusion process of silica rubber through a chemical reaction is unstable, and the flow mechanism in the extruder is still unclear. In this study, styrene-butadiene rubber (SBR) has been chosen as the matrix and the reinforcing effects of two different kinds of fillers, silica and titanium dioxide, have been investigated on SBR. Additionally, the effect of the properties of the SBR/filler composites on extrudate swelling has been examined. The reinforcing effect of the filler was confirmed by dynamic viscoelasticity, and the swell ratio was measured using a capillary rheometer. The results suggest that titanium dioxide has no reinforcing effect, as there is no interaction between titanium dioxide and the molecular structure of SBR. In contrast, there was a significant interaction between silica and SBR. It was found that the bound rubber, which is an SBR gel with restricted molecular chains, causes a reduction in the swell ratio, and this reduction effect is larger than that caused by filling the filler in the matrix. Furthermore, it was observed that this bound rubber deforms during flow and affects the extrudate swell phenomenon. Note de contenu : - EXPERIMENTAL : Materials - Dynamic viscoelasticity measurement - Morphology of filler in the rubber - Capillary extrusion - Bound rubber measurement - RESULTS AND DISCUSSION : Dynamic viscoelasticity and morphology - Effect of filler on capillary extrusion characteristics - Effect of bound rubber on capillary extrusion characteristics - Table : Composition of the compounds DOI : https://doi.org/10.1515/ipp-2022-4153 En ligne : https://drive.google.com/file/d/1vNb4ggmDR9uDhqNpZ1hISFfoI07hKyCf/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37627 [article]

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Resolving the conflict of a simultaneously highly moisturizing and occlusive emulsion film / Yuji Sakai in IFSCC MAGAZINE, Vol. 9, N° 1 (01-02-03/2006)

[article]  inIFSCC MAGAZINE > Vol. 9, N° 1 (01-02-03/2006) . - p. 23-28 Titre : Resolving the conflict of a simultaneously highly moisturizing and occlusive emulsion film Type de document : texte imprimé Auteurs : Yuji Sakai, Auteur ; Masashi Suzuki, Auteur ; Yasuhiro Ohara, Auteur ; Shinya Okabe, Auteur Année de publication : 2006 Article en page(s) : p. 23-28 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Film  émulsion'  'Stratum  corneum'  'Surfactant  polyglycérine-type  '  'Fonction  hydratante'  occlusive'  'Microscope  laser' Index. décimale : 668.5 Parfums et cosmétiques Résumé : Two basic functions of emulsion-based cosmetic products are moisturization and occlusion, which are markedly affected by the ratio of hydrophilic to lipophilic parts in the emulsions. However, due to their conflicting requirements, it is difficult to simultaneously improve both functions. Therefore, we developed new emulsion that has simultaneously higher moisturizing and occlusive functions than those of polyoxyethelene-type emulsions, by using polyglycerin-type surfactants, acetyl alcohol, polyglycerin-13-polyoxybutylene-14-stearyl ether and the D-phase emulsification method, because of dispersing a large quantity of water into the lipophilic part of the applied emulsion film and of strengthening the hydrophilic part of the emulsion film. We confirmed through microscopic study with a laser microscope that in polyoxyethelene-type emulsions, droplets disappear quickly after the film is formed and dried, whereas in our experimental emulsions, the droplets’ shape is evenly retained. Furthermore, after 1 month of continuous use, stratum corneum removal and corneocyte arrangement also improved significantly. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10522 [article]

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