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The dynamic apparent viscosity of polymer melts during pulsatile extrusion flow with vibration force field / G.-J. He in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 1 (03/2008)
[article]
Titre : The dynamic apparent viscosity of polymer melts during pulsatile extrusion flow with vibration force field : Theory and experiment Type de document : texte imprimé Auteurs : G.-J. He, Auteur ; X.-C. Yin, Auteur ; J.-P. Qu, Auteur Année de publication : 2008 Article en page(s) : p. 2-7 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Extrusion:Polymères -- Extrusion
Polypropylène
Rhéologie
Rhéomètres
ViscositéIndex. décimale : 668.9 Polymères Résumé : The dynamic apparent viscosity of polymer melts during pulsatile extruding flow with a vibration force field was studied on a self-made dynamic capillary rheometer (DCR). A theory that could reflect the vibration influence on the dynamic apparent viscosity was proposed. Due to the superposition of the vibration force field upon the steady shear flow, the phase difference between the shear stress and the shear rate could be chosen as a parameter to reflect the effect of vibration on the dynamic apparent viscosity. According to this theory, the average shear rate during pulsatile extrusion increased because of the existence of the phase difference, which caused the decrease of the dynamic apparent viscosity. The experimental results proved that the phase difference was reduced with the increase of vibration frequency, which resulted in a decrease in the dynamic apparent viscosity during the pulsatile extrusion. DOI : 10.3139/217.0002 En ligne : https://drive.google.com/file/d/1TtXJ7siyZ2rKogu1f7aVP0YkeuXfjF6C/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2654
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIII, N° 1 (03/2008) . - p. 2-7[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 009860 - Périodique Bibliothèque principale Documentaires Disponible The effect of bead vacuum on slot die coating / H.-M. Chang in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 2 (05/2009)
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Titre : The effect of bead vacuum on slot die coating Type de document : texte imprimé Auteurs : H.-M. Chang, Auteur ; C.-C. Lee, Auteur ; T.-J. Liu, Auteur Année de publication : 2009 Article en page(s) : p. 157-166 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The effect of bead vacuum on the minimum wet thickness obtained on horizontal and vertical slot die coatings was experimentally examined using a flow visualization technique. The commercial software package FLOW3D was used to simulate the two-dimensional coating flow. Macroscopic material balances were applied to estimate the effect of bead vacuum. Applying vacuum on the coating bead was found to reduce the minimum wet thickness and increase the maximum coating speed, with the effect on horizontal slot die coating being more pronounced. Visual observations revealed that with increasing vacuum, the upstream meniscus against the moving web was pulled back significantly for a low-viscosity solution, and the dynamic contact angle was reduced for a high-viscosity solution. The observed upstream wetting length for a low-viscosity solution subject to bead vacuum was consistent with the prediction using macroscopic balances. The sizes of coating beads predicted by FLOW3D were generally larger than those observed from flow visualization. Coating failures caused by high bead vacuum could be predicted with the aid of numerical simulations. DOI : 10.3139/217.2219 En ligne : https://drive.google.com/file/d/1S3JnQnKJRx43EDSy4NvtGmqaoHXoo5f8/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5247
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 2 (05/2009) . - p. 157-166[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 011293 - Périodique Bibliothèque principale Documentaires Disponible The effect of CO2 pressure on viscoelasticity of LDPE / S. Ouchi in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 2 (05/2008)
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Titre : The effect of CO2 pressure on viscoelasticity of LDPE Type de document : texte imprimé Auteurs : S. Ouchi, Auteur ; Y. Masubuchi, Auteur ; H. Shikuma, Auteur Année de publication : 2008 Article en page(s) : p. 173-178 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Polyéthylène basse densité
ViscoélasticitéIndex. décimale : 668.9 Polymères Résumé : The effect of impregnated carbon dioxide (CO2) and pressure on dynamic viscoelastic responce of a commercial LDPE was investigated by a magnetic driven rotational rheometer equipped with a high-pressure chamber. It was found that i) the mode distribution of the viscoelastic relaxation is not sensitive to CO2 pressure realizing the superposition among moduli obtained at different pressures, that ii) the horizontal shift factor for the superposition reflecting the monomeric friction exponentially decreases with increase of the pressure, and that iii) the vertical shift factor relating to the entanglement number density is not sensitive to the pressure. From the observation it is suggested that CO2 and pressure mainly affect the monomeric friction and the effect on the entanglement dilation is not significant. The results are consistent with the dielectric measurement on polyisoprene (Matsumiya et al., Nihon Reoroji Gakkaishi, 35, 155-161, 2007). DOI : 10.3139/217.2030 En ligne : https://drive.google.com/file/d/1KvS4DiiETuGTqqfFBoXKGvOv3to0vgF4/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2645
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIII, N° 2 (05/2008) . - p. 173-178[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 010098 - Périodique Bibliothèque principale Documentaires Disponible The effect of feeding method and compatibilizer on nanoclay partitioning and microfibrillar morphology development in PP/PBT/organoclay blend nanocomposite fibers / A. Bigdeli in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 2 (05/2013)
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Titre : The effect of feeding method and compatibilizer on nanoclay partitioning and microfibrillar morphology development in PP/PBT/organoclay blend nanocomposite fibers Type de document : texte imprimé Auteurs : A. Bigdeli ; Hussein Nazockdast Année de publication : 2013 Article en page(s) : p. 174-179 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères
Argile
Extrusion filage
Fibres
Fibrillation
Nanoparticules
Polybutylène téréphtalate
PolypropylèneIndex. décimale : 668.9 Polymères Résumé : The role of feeding method, as an important parameter in competition with thermodynamic parameters, on determining the nanoclay partitioning and its impact on microfibril formation in PP/PBT blend nanocomposite fibers were investigated. In the direct feeding method in which all components were fed into the extruder simultaneously, the major part of nanoclay with almost unchanged interlayer d-spacing was located in the PP matrix and the rest of the nanoclay partitioned into the PBT dispersed phase. However in the PBT based masterbatch method nanoclay, due to much greater melt intercalation occurred, remained in PBT droplets in the form of tactoids and/or platelets. In the masterbatch feeding method, incorporation of compatibilizer assisted more fraction tactiods and/or platelets to be transferred from PBT to the PP matrix while in the direct method it enhanced the extent of melt intercalation in the PP matrix. It was demonstrated that the nanoclay concentration in PBT droplets plays an important role in the extent of the microfibril formation during the melt spinning process. While at low organoclay loading (1 wt%) fine microfibrils could be formed in the fibers prepared by both methods of feeding, at higher organoclay loading (3,5 wt%) uniform microfibrils could hardly be developed in the fibers, particularly, in the masterbatch feeding method due to high melt elasticity of the PBT droplets and uneven distribution of platelets and/or tactoids in the droplets.
DOI : 10.3139/217.2669 En ligne : https://drive.google.com/file/d/105SKV12MRMcB16iJEgLF1jBbUGylWXMQ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18427
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 2 (05/2013) . - p. 174-179[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15050 - Périodique Bibliothèque principale Documentaires Disponible The effect of miscibility on rheological and mechanical properties of PCL/SAN blends / P. Saha in INTERNATIONAL POLYMER PROCESSING, Vol. XIV, N° 3 (09/1999)
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Titre : The effect of miscibility on rheological and mechanical properties of PCL/SAN blends Type de document : texte imprimé Auteurs : P. Saha, Auteur ; L. Keyzlarová, Auteur Année de publication : 1999 Article en page(s) : p. 228-233 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Earlier, poly(ε-caprolactone) (PCL) and poly(styrene-co-acrylonitrile) (SAN) were found to be miscible on molecular level at 8 up to 28 wt. % of acrylonitrile (AN) in SAN copolymer [1]. The combination of PCL and different copolymers of SAN thus offers an opportunity to investigate the effect of miscibility on some key properties of the blends, e.g. rheological or mechanical. In this paper blends containing SAN with 25 wt. % of AN (miscible SAN-25) and 35 wt. % of AN (immiscible SAN-35) were used for this purpose.
Blends of PCL with various contents of SANs up to 40wt.% were prepared by melt mixing in a Brabender laboratory mixer. The miscibility of the mixed PCL/SAN blends was investigated by differential scanning calorimetry (DSC). The blends rheological characteristics were determined on a Rheoflixer capillary rheometer at various temperatures. Rabinowitsch and Bagley corrections and the power-law relation were used. The extrudates were observed under a scanning electron microscope. In addition, mechanical testing was performed on a tensile testing machine.
It was found that blends of PCL with a minor amount of miscible SAN-25 provide a better balance of rheological and mechanical properties than those of pure PCL. The immiscible blend shows properties inferior to the miscible one. Immiscible SAN-35 increases viscosity, shear thinning and extrudate swell of PCL more than the miscible type. In contrast to the miscible blends containing SAN-25, which were without any form of unstable flow at shear rates of 10 to 10000s-1, melt fracture occurs in the immiscible blends with SAN-35. Positive synergism in tensile strength and elongation at break can be seen for 90/10 PCL/SAN-25 blend processed at 130°C. The addition up to 30wt.% of SAN-25 miscible with PCL increases elongation at break.DOI : 10.3139/217.1552 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16133
in INTERNATIONAL POLYMER PROCESSING > Vol. XIV, N° 3 (09/1999) . - p. 228-233[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001009 - Périodique Bibliothèque principale Documentaires Disponible The effect of post-extrusion conditions in ribbon extrusion of polymer blend / D. Ramirez-Arreola in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 2 (05/2006)
PermalinkThe effect of shear strain amplitude and loading cycle on the horizontal characteristics of fiber reinforced nanocomposite elastomeric seismic isolators / M. Mokthtari Motameni in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 2 (05/2013)
PermalinkThe effect of silane treated hybrid filler on the mechanical and thermal performance of carboxylated nitrile butadiene rubber (XNBR) composites / A. Mousa in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)
PermalinkThe effects of compression pressure on injection compression molding / C.-M. Chen in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 2 (06/2000)
PermalinkThe evaluation of miscibility of poly(vinyl chloride) and poly(ethylene oxide) blends by DSC, refractive index and XRD analyses / S. Ramesh in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 4 (09/2009)
PermalinkThe filling behavior of reinforcing glass fiber in micro injection molding / G. L. Liou in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 4 (09/2010)
PermalinkThe flow behavior of core material and breakthrough phenomenon in sandwich injection molding / D. Watanabe in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 4 (12/2003)
PermalinkThe flow behavior of core material and breakthrough phenomenon in sandwich injection molding / D. Watanabe in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 4 (12/2003)
PermalinkThe gloss of injection-moulded recovered polypropylene / F. Pisciotti in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 3 (09/2005)
PermalinkThe Ici polyurethanes book / Georges Woods / ICI Polyurethanes (1990)
PermalinkThe influence of moisture and laminate setup on the de-consolidation behavior of PA6/GF thermoplastic matrix composites / Christian Gröschel in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 5 (11/2014)
PermalinkThe kinetics and mechanism of the direct fluorination of polyethylenes / Alexander P. Kharitonov in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 88, B3 (09/2005)
PermalinkThe linear viscoelastic behavior of a series of 3-hydroxybutyrate-based copolymers / D. H. Melik in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 5 (11/2007)
PermalinkThe (love & hate) role of entropy in process metallurgy / Halvard Tveit in MATERIAUX & TECHNIQUES, Vol. 107, N° 5 (2019)
PermalinkThe mapping method for mixing optimization / P. G. M. Kruijt in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 2 (06/2001)
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