Rheological and morphological properties of immiscible blends and microfiber preparation from the blends / W. S. Lyoo in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 4 (12/2000)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XV, N° 4 (12/2000) . - p. 369-379 Titre : Rheological and morphological properties of immiscible blends and microfiber preparation from the blends Type de document : texte imprimé Auteurs : W. S. Lyoo, Auteur ; Y. G. Choi, Auteur ; J. H. Choi, Auteur ; W. S. Ha, Auteur ; B. C. Kim, Auteur Année de publication : 2000 Article en page(s) : p. 369-379 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Screw extrusion/Mixing - One modified poly(ethylene terephthalate) (m-PET) containing 16 mol % of isophthalic acid content and three kinds of isotactic polypropylene (i-PP) with different molecular weights were melt blended in various volume ratios by a twin screw extruder. The dynamic viscosity of the i-PP/m-PET blend showed positive deviation at lower volume content of i-PP and negative deviation at higher volume content of i-PP. The size of dispersed phase increased with an increase of the minor component. Also, the less difference between the viscosities of two polymers caused the smaller particle size in the blend and the smaller critical Weber number. After melt spinning of these binary polymer blends, m-PET and i-PP micro staple fiber, whose diameter was about 0.13 to 2.75 µm, could be obtained by extracting the continuous phase with a proper solvent. The less the minor component in the blend, the better the spinnability of the blended polymers and the physical properties of the fiber. Also, when i-PP was the continuous phase, the spinnability and the physical properties of the fibers were better than the opposite case. Molecular weight of i-PP and the blend ratio had a marked influence on the diameter of microfibers. The micro fiber obtained from i-PP which has similar viscosity with m-PET showed the smallest diameter than those obtained from other two i-PPs. Note de contenu : - EXPERIMENTAL : Materials - Preparation of blend - Melt spinning of blend - Microfiber formation- Characterization of product - RESULTS AND DISCUSSION : Rheological properties of the blend - Dependence of phase size on the blend composition - Melt spinning of the blend DOI : 10.3139/217.1610 En ligne : https://drive.google.com/file/d/13R0k0oZBA6cO52LNvxM_910IGnApQsGP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16155 [article]

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Structural analysis examining the mold deformation behavior for the detection of the flash in the injection mold / J. H. Choi in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 4 (08/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 4 (08/2014) . - p. 489-494 Titre : Structural analysis examining the mold deformation behavior for the detection of the flash in the injection mold Type de document : texte imprimé Auteurs : J. H. Choi, Auteur ; B. G. Pyo, Auteur ; J. S. Tae, Auteur ; H. P. Park, Auteur ; B. O. Rhee, Auteur Année de publication : 2014 Article en page(s) : p. 489-494 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse structurale (ingénierie) Bavures (usinage et moulage) Matières plastiques -- Moulage par injection Moulage par injection -- Défauts Moules d'injection Index. décimale : 668.4 Plastiques, vinyles Résumé : Flash known as burr is defined as additional resin filling a gap between parted surfaces. It is caused by mold deformation from excessive cavity pressure. In our previous research, there had been attempts to detect the occurrence of the flash using the contact-pressure-sensor which was developed. Although the sensor showed a reliable response of mold deformation, the sensor alone could not tell us the exact occurrence of flash. In order to understand response of the sensor, a structural analysis in conjunction with a molding analysis was carried out. In the analysis, the platens of an injection molding machine were included in the model to accurately implement deformation of the mold. We found that the trend of strain predicted by the CAE analysis was similar to the measured one although the strain value was not comparable. We examined the stress at the parting edge and found that the most probable moment for the flash occurrence appeared when the z-axis stress was closed to zero value. Note de contenu : - FLASH OCCURENCE : Cause of flash - Measurement of flash occurence - THE CONTACT-PRESSURE-SENSOR : Sensor installation - Strains at parting surface - STRUCTURAL ANALYSIS OF BUMPER : Molding analysis - Structural analysis - RESULTS AND DISCUSSIONS : Measured strain by the sensor - CAE results DOI : 10.3139/217.2891 En ligne : https://drive.google.com/file/d/1oe2eqOnOblThkrbWXjMyd0OyQTH9pdhS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21828 [article]

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