Edge effect in hot embossing and its influence on global pattern replication of polymer-based microneedles / J. Zhuang in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 2 (05/2019)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIV, N° 2 (05/2019) . - p. 231-238 Titre : Edge effect in hot embossing and its influence on global pattern replication of polymer-based microneedles Type de document : texte imprimé Auteurs : J. Zhuang, Auteur ; D.-M. Wu, Auteur ; H. Xu, Auteur ; Y. Huang, Auteur ; Y. Liu, Auteur ; J.-Y. Sun, Auteur Année de publication : 2019 Article en page(s) : p. 231-238 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Effet de bord Gaufrage à chaud Micro-aiguilles Polyméthacrylate de méthyle Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec. Index. décimale : 668.4 Plastiques, vinyles Résumé : Hot embossing was used to fabricate a microneedle array on poly(methyl methacrylate) (PMMA) substrates. Both experimental and numerical researches were carried out to investigate the whole formation process. The results showed that the edge effect would significantly influence the replication rate of final products. An optimization design of convex flow barrier was proposed to improve the replication efficiency and structure uniformity. Furthermore, optimum parameters of the flow barrier were found to be 2 mm in length and 0.2 mm in height. Reasonable high molding temperature and force were conducive to reduce the filling time and increase the average height of microneedles. Note de contenu : - NUMERICAL SIMULATION : Physical and numerical modeling - Material properties - EXPERIMENTAL : Material and equipment - Experimental design - RESULTS AND DISCUSSION : Edge effect and optimization of structure uniformity - Influence of molding temperature and embossing force on mold filling in hot embossing process - Comparison of the average height of microneedles under different parameters based on the numerical and experimental results DOI : 10.3139/217.3726 En ligne : https://drive.google.com/file/d/1wyGC0z4P0QBNlnd5ayxq5ff6xuAhl9uZ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32397 [article]

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Hydrolysis of a, B-layered sodium disilicate in ions binding process / J.-X. Dong in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 45, N° 1/2008 (01-02/2008)  

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 45, N° 1/2008 (01-02/2008) . - p. 6-12 Titre : Hydrolysis of a, B-layered sodium disilicate in ions binding process Type de document : texte imprimé Auteurs : J.-X. Dong, Auteur ; J.-P. Li, Auteur ; H. Xu, Auteur ; L.-P. Li, Auteur Année de publication : 2008 Article en page(s) : p. 6-12 Note générale : Bibliogr. Langues : Anglais (eng) Tags : A,  B-layeres  sodium  disilicate  Hydrolisys  Ion  binding  process  Mechanism Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : In different type water, the hydrolysis of B-Na2Si2O5 was investigated near washing clothing concentration by XRD, SEM chemical analysis and residual solid yield. B-Na2Si2O5 changed to kanemite in distilled water. In water with Ca2+ or Mg2+, B-Na2Si2O5 transformed to a mixture of kanemite, Ca(OH)2 and amorphous silicate or a mixture of kanemite (NaHSi2O5 ·3H2O), Mg(OH)2 and amorphous silicate. a-Na2Si2O5 changed to an unknown phase in distilled water. In water with Ca2+ or Mg2+, a-Na2Si2O5 transformed to a mixture of unknown phase, Ca(OH)2 and amorphous silicate or a mixture of unknown phase, Mg(OH)2 and amorphous silicate. The experimental data showed that the divalent cation binding process of a, B-Na2Si2O5 belongs to a mixture process with divalent cations exchange with Na+ cation and precipitation in form of insoluble amorphous solid. En ligne : https://drive.google.com/file/d/1LpQxebkgDjkomQ6ThTktl84UX5KsIHdt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3049 [article]

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Preparation and characterization of pillared derivatives from d-layered sodium disilicate and their tribological properties in liquid paraffin / Yilei Fu in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 1/2010 (01-02/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 1/2010 (01-02/2011) . - p.67-72 Titre : Preparation and characterization of pillared derivatives from d-layered sodium disilicate and their tribological properties in liquid paraffin Type de document : texte imprimé Auteurs : Yilei Fu, Auteur ; Y. Wang, Auteur ; H. Xu, Auteur ; J.-P. Li, Auteur ; J.-X. Dong, Auteur Année de publication : 2011 Article en page(s) : p.67-72 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Disilicate  de  sodium'  Caractérisation  'Réduction  des  propriétés  friction'  'Ammonium  diméthyle  dioctadécyle'  Portance  'Chlorure  d'ammonium  bisoctyle' Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The pillared derivatives from δ-layered sodium disilicate were investigated by intercalation of bisoctyl dimethyl ammonium chloride and dioctadecyl dimethyl ammonium chloride. The influence of various parameters such as water content, pH of the mixture, and time were examined. The resultant samples were characterized by X-ray powder diffraction, Fourier transform infrared, and thermal gravimetric observation. The experimental results showed that δ-layered sodium disilicate was first transformed to kanemite (NaHSi2O4(OH)2 · 2H2O), and subsequently kanemite was pillared with bisoctyl dimethyl ammonium chloride or dioctadecyl dimethyl ammonium chloride. The tribological properties of typical samples then were investigated by point contact test. The results show that the pillared derivatives have good load-carrying capacity and friction-reducing property. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10675 [article]

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A stiffness criterion for cooling time estimation / H. Xu in INTERNATIONAL POLYMER PROCESSING, Vol. XIV, N° 1 (03/1999)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIV, N° 1 (03/1999) . - p. 103-108 Titre : A stiffness criterion for cooling time estimation Type de document : texte imprimé Auteurs : H. Xu, Auteur ; David O. Kazmer, Auteur Année de publication : 1999 Article en page(s) : p. 103-108 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Molding - The cooling time of an injection molded part directly affects the production cost and efficiency. In order to accurately estimate the cooling time, it is necessary to define the ejection condition. One common criterion for part ejection is when the mean or maximal temperature is equal or less than an estimated ejection temperature, Te [1]. But in industrial practice, the ejection condition is determined by the part's deformation or warpage due to ejection forces and subsequent cooling [2]. This research uses a combination of experimental, analytical, and statistical methods to discuss different ejection criteria and their rationality, thereby developing a more effective criterion based on part stiffness. This stiffness criterion facilitates more accurate estimation of cooling time at early stages of product development. This knowledge will help the designer to improve the design and reduce the cost by increasing the production efficiency while simultaneously ensuring injection molded part quality. DOI : 10.3139/217.1522 En ligne : https://drive.google.com/file/d/1cF9MaPl42iD-peKXUSzHMRqxP20yHUHL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16118 [article]

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Tight tolerance thermoforming / H. Xu in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 2 (06/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 2 (06/2001) . - p. 208-215 Titre : Tight tolerance thermoforming Type de document : texte imprimé Auteurs : H. Xu, Auteur ; David O. Kazmer, Auteur Année de publication : 2001 Article en page(s) : p. 208-215 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Tighter tolerances are becoming more prevalent as thermoforming applications are increasingly utilized in multiple component assemblies with load bearing and other functional capabilities. A1 analytical method is described for shrinkage predictions utilizing a thermoviscoelastic constitutive model to try and avoid costly and time consuming forming trials by determine adequacy of the mold and process a-priori. Validation experiments and sensitivity analyses were performed to understand the process behavior and estimate the accuracy of the shrinkage analysis. Design and manufacturing guidelines were then developed to facilitate tight tolerance thermoforming. While the analysis was generally capable of predicting linear shrinkage, statistical yield models indicated that improved process control and further process development is required to consistently produce thermoformed parts to tight tolerances. Note de contenu : - Shrinkage prediction and validation - Shrinkage validation - Tight tolerance thermoforming DOI : 10.3139/217.1629 En ligne : https://drive.google.com/file/d/1xUxeEGeEKJmJzRWgKnmD5HdNogw6naHB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15901 [article]

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