Effects of zinc fatty acids on improved polymer processing for critical extrusions / K.-J. Kim in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 2 (06/2003)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 2 (06/2003) . - p. 156-165 Titre : Effects of zinc fatty acids on improved polymer processing for critical extrusions Type de document : texte imprimé Auteurs : K.-J. Kim, Auteur ; J. Vanderkooi, Auteur Année de publication : 2003 Article en page(s) : p. 156-165 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The processability of TESPD coupled silica-black-solution SBR with zinc fatty acids (EF and ZB) in an internal mixer and extruder was investigated. The processability, rheological property, and vulcanization property of their composite were measured as a function of storage conditions including time and humidity and as a function of mixing sequence (1P and 2P). Processing through a single screw extruder, processing additive, zinc fatty acid, added compounds exhibited lower pressure build up than without-additive compound (Control) and their viscosities were lower than the Control. The EF-2P and the ZB-2P compounds exhibited lower pressure build up than the EF-1P and the ZB-1P ones, respectively. The Mooney viscosities of both the dry and the humid exposed ones increased as the storage time increased and the viscosities of the humid exposed compounds exhibited slightly higher than the dry ones. The cure times of the humid exposed compounds were shorter than that of the dry ones, and as the storage time increases, the cure time of the dry ones were varied depending on mixing sequence; however that of the humid exposed ones were decreased. The torque rises (MH - ML) of the humid exposed compounds were higher than that of the dry ones as the storage time increases, and while the torque rises of the dry compounds tend to remain constant that of the humid exposed ones increased. Processing additive added compounds (EF-1P, EF-2P, ZB-1P and ZB-2P) exhibited lower modulus and longer cure time than the Control. DOI : 10.3139/217.1734 En ligne : https://drive.google.com/file/d/18hvaMV2u1XFWUsHcEVzdwL-sCpbYUucy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3306 [article]

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Reactive batch mixing for improved silica-silane coupling / K.-J. Kim in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 4 (12/2004)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIX, N° 4 (12/2004) . - p. 364-373 Titre : Reactive batch mixing for improved silica-silane coupling Type de document : texte imprimé Auteurs : K.-J. Kim, Auteur ; J. Vanderkooi, Auteur Année de publication : 2004 Article en page(s) : p. 364-373 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Moisture (55 wt%) treated silica compounds, bis(triethoxysilylpropyl) disulfide(TESPD)/silica/carbon black/S-SBR was processed in a batch mixer and they were investigated with respect to the alcohol residue level in silane, the processability, the vulcanization characteristics, and the mechanical properties. Treatment of moisture on the TESPD/silica/carbon black/S-SBR compound showed a lower alcohol level than untreated material. The alcohol level was low at high drop temperatures. The probe temperatures of the moisture treated compound were lower than the drop temperature, while that of the untreated compound was higher than the drop one. The vulcanization properties of the compounds were changed by treatment of moisture and this improved the mechanical properties of the compounds. The treatment of moisture on silica surface increased the hydrolysis reaction of the alkoxy silane and the hydrolyzed silane improved the coupling reaction with the hydroxyl group on silica surface during reactive batch processing. It also reduced the rate of temperature rise during batch processing due to the latent heat of the moisture and the endothermic reaction between silica and silane. At the vulcanization stage, it seemed to further increase the coupling reaction between silica and silane. The steric hindrance theory of an alkoxy silane has to be reconsidered with a large amount of moisture treated silica/TESPD/CB/S-SBR compound system. DOI : 10.3139/217.1844 En ligne : https://drive.google.com/file/d/1raBulJau1On7IvFpXHtWpytoyDr87IM4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3269 [article]

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Rheological effect of zinc surfactant on the TESPT-Silica Mixture in NR and S-SBR compounds / K.-J. Kim in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 3 (09/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 3 (09/2002) . - p. 192-200 Titre : Rheological effect of zinc surfactant on the TESPT-Silica Mixture in NR and S-SBR compounds Type de document : texte imprimé Auteurs : K.-J. Kim, Auteur ; J. Vanderkooi, Auteur Année de publication : 2002 Article en page(s) : p. 192-200 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The effects of zinc surfactants (ZB) on the TESPT (bis(triethoxysilylpropyl)tetrasulfide)-silica mixture in NR (isoprene rubber) and S-SBR (solution butadiene-co-styrene rubber) were investigated, and their processability, dynamic, mechanical, heat build up, blowout properties, and silica dispersion characteristics were compared. In the NR composite, the addition of ZB increased the reversion resistance time, tensile modulus, and blowout time and lowered the viscosity, heat build up and tand values. In the S-SBR composite, the addition of ZB increased the heat build up, and tand values of the compound. Over all, in the NR compounds, addition of the ZB significantly increased the processability and mechanical property; however, in the S-SBR compounds, it increased the processability but it was not effective in improving mechanical property. Note de contenu : - EXPERIMENTAL : Materials - Mixing - Shear viscosity measurement - Reversion test - Viscoelastic property (tandelta) - Tensile test - Blowout(BO) and heat build up (HBU) test - Scanning electron microscope characterization - RESULTS : Temperature changes during mixing - SEM characterization - Steady shear viscosity - Mooney viscosity - Viscoelastic property (tandelta) - Reversion test - Tensile test - Blowout (BO) and heat build up (HBU) - Interpretation : Mechanism DOI : 10.3139/217.1700 En ligne : https://drive.google.com/file/d/1V27D21p_wFLR5yT5NtVx_Kds_qrLCmXY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15994 [article]

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