CO2 laser ablation of microchannel on PMMA substrate for effective fabrication of microfluidic chips / X. Chen in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 2 (05/2016) . - p. 233-238 Titre : CO2 laser ablation of microchannel on PMMA substrate for effective fabrication of microfluidic chips Type de document : texte imprimé Auteurs : X. Chen, Auteur ; T. Li, Auteur ; J. Shen, Auteur Année de publication : 2016 Article en page(s) : p. 233-238 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : 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. Puces microfluidiques Usinage par laser Index. décimale : 668.4 Plastiques, vinyles Résumé : This paper reports a simple and rapid method for fabrication of microfluidic chips on polymethylmethacrylate (PMMA) substrate using a flexible and low-cost CO2 laser system. The CO2 laser employed has a wavelength of 10.6 ?m. The laser power used for channel fabrication ranged from 3 and 12 W, the beam travel speeds ranged from 5 to 50 mm/s and the passes were varied in the range of 1 to 3 times. Typical channel depths were between 100 and 900 ?m, while the width of fabricated channels ranged from 100 to 300 ?m. The effects of the process parameters (the laser power, the beam travel speed of the laser beam and the number of passes) on the dimensional quality (the depth, the width and their aspect ratio) of the microchannel manufactured from PMMA were experimentally investigated. The change law of the channel geometry depending on process parameters was obtained. A high reproducibility of micro-channel geometry was attained. At last, a CO2 laser output power of 5.5 W and a laser beam travel speed of 35 mm/s combining a hot press bonding technique were chosen to fabricate a microfluidic chip within half hour. The pattern qualities and experimental results confirm that the CO2 laser micromachining technology has a great potential for application in flexible, rapid and economic production of polymeric microfluidic chips. Note de contenu : - MATERIALS AND METHODS : Materials and reagents - Experimental set up - Laser ablation process of microchannel - RESULTS AND DISCUSSION : Channel profile - Effects of laser power and beam travel speed on depth of microchannel - Effects of laser power and beam travel speed on width of microchannel - Effects of the pass on depth of microchannel - Effects of the pass on width of microchannel - Fabrication of large aspect ratio of microchannel - Hot press bonding of microchannel DOI : 10.3139/217.3184 En ligne : https://drive.google.com/file/d/1T_p4aH5CnIMAx_7J41UGIYq8jjwd8Ygx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26181 [article]

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Quantifying extrusion modification of LDPE with a microcompounder / T. Li in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 1 (03/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 1 (03/2012) . - p. 91-97 Titre : Quantifying extrusion modification of LDPE with a microcompounder Type de document : texte imprimé Auteurs : T. Li, Auteur ; K. Kuklisin, Auteur ; J. Auger, Auteur ; J. Nielsen, Auteur ; W. Lin, Auteur Année de publication : 2012 Article en page(s) : p. 91-97 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chromatographie sur gel Ecrouissage Malaxeurs et mélangeurs Matières plastiques -- Extrusion Poids moléculaires Polyéthylène basse densité Résonance magnétique nucléaire Rhéologie Index. décimale : 668.9 Polymères Résumé : Processibility of LDPE is known to be sensitive to processing history. Significant changes in processibility and product properties can occur through repeated extrusion without detectable changes in molecular weight and molecular weight distribution. Such changes of LDPE rheology are simulated with DSM micro-compounder and characterized with the small angle oscillatory tests and the SER uni-axial extensional flow with a K-BKZ analysis. Both the linear and the nonlinear rheology data suggest the major mechanism in the extrusion with the DSM micro-compounder is the reduction of the effects of long chain branching. The linear rheology analysis, along with GPC and NMR characterization confirms that the changes in the extrusion are not due to chemical crosslinking, though an increase in backbone molecular weight at extreme conditions is perceivable through the minor increase in molecular weight distribution, the increase in zero-shear viscosity and the decrease of melt index. The extensional rheology results, on the other hand, reveal the depression of the strain hardening with prolonged extrusion at 190 degree C or higher extrusion temperature. The stress growth data were evaluated with a K-BKZ constitutive with exponential damping function. The depression of strain hardening is well characterized with the strain hardening factor and the non-linear exponent beta as function of the extrusion conditions. The damping factor β is observed to be especially effective as the parameter to follow the depression of the strain hardening due to microcompounder extrusion. The microcompounder extrusion and the SER analysis with the KBKZ analysis prove to be a new useful tool for simulating the shear modification of the LDPE. Note de contenu : - LINEAR AND NON-LINEAR RHEOLOGICAL ANALYSES - EXPERIMENTAL : GPC - NMR - RESULTS AND DISCUSSION : Linear viscoelastic properties DOI : 10.3139/217.2421 En ligne : https://drive.google.com/file/d/1ILOBQQEN2Z6ZMbi9-ZmRaV-d3bo-Zd4B/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13737 [article]

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