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Effect of processing conditions on the dispersion of vapor grown carbon fiber in a polyamide 6 and the crystalline structure of their composites by melt compounding / T. Koyama in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 3 (07/2010)
[article]
Titre : Effect of processing conditions on the dispersion of vapor grown carbon fiber in a polyamide 6 and the crystalline structure of their composites by melt compounding Type de document : texte imprimé Auteurs : T. Koyama, Auteur ; Shuichi Tanoue, Auteur ; Y. Iemoto, Auteur Année de publication : 2010 Article en page(s) : p. 181-187 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres de carbone
Fibres de carbone
Polyamide 6Tags : 'Polyamide 6' 'Phase vapeur' 'Fibre de carbone' 'Vapor grown carbon fiber' (VGCF) Index. décimale : 668.9 Polymères Résumé : We present the preparation of polyamide 6 (PA6)/Vapor Grown Carbon Fiber (VGCF) composites by melt compounding. Two commercialized forms of PA6 with different melt flow rates (herein named PA6-low and PA6-high.) and two VGCF, VGCF-H (aspect ratio: 40) and VGCF-S (aspect ratio: 100) were used in this study. Young's modulus and the yield strength increased when small amount of VGCF (e.g. 1 wt.%) was added to PA6, and the properties of PA6-low/VGCF composites increased with a decrease in the aspect ratio of VGCF. According to scanning electron microscopy (SEM) observations, the dispersion state of VGCF in PA6-low/VGCF-S composites is superior to the PA6-low/VGCF-H composites. This may be due to the weakening of tensile properties caused by cracks between the adjoining crystals generated by the large amount of VGCF that act as nucleants. Hence, the aspect ratio of VGCF has an influence on the tensile properties of PA6/VGCF composites. The mechanical properties were shown to increase with VGCF-H length. Matrix viscosity and the screw rotation speed were also found to influence the mechanical properties of PA6/VGCF-H composites. DOI : 10.3139/217.2307 En ligne : https://drive.google.com/file/d/1Hczpte4Dsd4HQ9G5-7yU74TBKnqMLFTD/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9730
in INTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 3 (07/2010) . - p. 181-187[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012302 - Périodique Bibliothèque principale Documentaires Disponible Free internal lipids in hair from pre- and post-menopausal women / Jennifer Wills in IFSCC MAGAZINE, Vol. 7, N° 4 (10-11-12/2004)
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Titre : Free internal lipids in hair from pre- and post-menopausal women Type de document : texte imprimé Auteurs : Jennifer Wills, Auteur ; Susan Dolphin, Auteur ; Louise Albiston, Auteur ; Presh Parmar, Auteur ; Gillian E. Westgate, Auteur ; Godfrey J. Harrap, Auteur Année de publication : 2004 Article en page(s) : p. 293-296 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Menopause lipids 'hair fiber' sebum age beauty attributes' Index. décimale : 668.5 Parfums et cosmétiques Résumé : Little is known about changes in hair lipids during life and their effects on hair properties. Our objectives were to study for the first time the effects of the female menopause on hair lipids, the contribution of sebum, and hair quality using pre-menopausal and post-menopausal subjects with and without hormone replacement therapy. Extracted hair lipids were quantified by high performance thin layer chromatography, forehead sebum output measured by sebumeter and hair greasiness, shine, softness and smoothness evaluated by expert assessment. Pre-menopausal free internal lipids contained free fatty acids, wax or cholesteryl esters, cholesterol, ceramides, triglycerides and squalene. The composition was distinct from scalp surface lipids collected at the same time and from hair follicles from facelift patients, with no wax or cholesteryl esters and squalene in follicles and no ceramides in the surface lipids. Wax or cholesteryl esters and squalene were decreased (P < 0.05) and cholesterol and ceramides increased (P < 0.05) in post-menopausal hair. The changes for squalene, wax or cholesteryl esters and cholesterol were reduced when hormone replacement therapy was taken. Sebum output and hair greasiness, shine, softness and smoothness fell significantly (P < 0.05) after menopause. Hormone replacement therapy increased (P < 0.05) results after menopause. It is concluded that hair free internal lipids derive from both the hair follicle and sebum. Sebum output falls after menopause and contributes less to hair lipids. The hair condition also changes. Understanding hair changes during life should improve matching of hair products to consumer needs. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10482
in IFSCC MAGAZINE > Vol. 7, N° 4 (10-11-12/2004) . - p. 293-296[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003885 - Périodique Bibliothèque principale Documentaires Disponible