Non-linear viscoelastic behavior of PVC plastisol / N. Nakajima in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 1 (03/2005)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 1 (03/2005) . - p. 8-14 Titre : Non-linear viscoelastic behavior of PVC plastisol Type de document : texte imprimé Auteurs : N. Nakajima, Auteur ; E. R. Harrell, Auteur Année de publication : 2005 Article en page(s) : p. 8-14 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de polyvinyle Viscoélasticité Index. décimale : 668.9 Polymères Résumé : Rheology of PVC plastisol is usually conducted with steady state flow. It is inadequate, because plastisol is viscoelastic, so that deformational experiment is also required. In the viscoelastic measurements, when either frequency or amplitude is increased, dynamic viscosity decreases first (pseudo-plastic), reaching a minimum and then, increases (dilatant). It is because the shear rate during the oscillation is a product of frequency and amplitude. The pseudo-plastic behavior is explained with stress-induced phase separation into an immobilized layer of packed particles and mobile phase of reduced particle concentration. The viscosity minimum corresponds to the yield point of the immobilized layer. The yielding obeys Coulomb’s criterion. After yielding the immobilized layer dilates with the further increase of shear rate. Two different modes of fracture are observed; one without yielding occurs at rather low shear stress, slightly higher than the cohesive strength of the immobilized layer. After yielding and dilation, the fracture occurs when shear stress becomes higher than normal stress. Before yielding the deformation of the immobilized layer is very small and accompanied with small fraction of particles moving over the neighboring particles. After yielding, deformation involves entire particles of the immobilized layer. DOI : 10.3139/217.1861 En ligne : https://drive.google.com/file/d/1-aljstGrhttsz30rX_bBRTxb3vaFFLxm/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3084 [article]

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Polymer processing problems from non-rheological causes / N. Nakajima in INTERNATIONAL POLYMER PROCESSING, Vol. XIV, N° 1 (03/1999)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIV, N° 1 (03/1999) . - p. 3-9 Titre : Polymer processing problems from non-rheological causes Type de document : texte imprimé Auteurs : N. Nakajima, Auteur Année de publication : 1999 Article en page(s) : p. 3-9 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : There are a variety of problems in polymer processing. In this paper those problems which arise from non-rheological causes are described. The examples were taken from the period from 1960 to 1970's. Even though remedial steps were taken at the time when problems occurred, similar problems may occur in the future. The problems are well-known among those who worked in the area, but may not be known widely, because very few have ever been published. Some of the problems may be eliminated in the course of improving polymerization and fabrication (processing) techniques. Some problem-solving will become easier with the improvement of sensitivity of analytical techniques. Some problems merit further scientific studies. Many problems provide seeds for inventions. Note de contenu : - Effect of additives - Blends - Single component polymer - Plasticized polymer - Thermoset resins - Cold forming (solid state forming) DOI : 10.3139/217.1505 En ligne : https://drive.google.com/file/d/1WJw7q3sPwQ0b-SP6PFnQO5r-2bG1O7OS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16105 [article]

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Preparation of foam from PVC plastisol / N. Nakajima in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 4 (09/2007)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 4 (09/2007) . - p. 352-358 Titre : Preparation of foam from PVC plastisol Type de document : texte imprimé Auteurs : N. Nakajima, Auteur Année de publication : 2007 Article en page(s) : p. 352-358 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de polyvinyle Mousses plastiques Index. décimale : 668.9 Polymères Résumé : The results of physical measurements and microscopic observation are presented to elucidate material behaviour at each stage of the foam preparation from PVC plastisol for use as a part of the cushion flooring. The paper also describes how the problems were solved by overcoming contradicting requirements in the process. DOI : 10.3139/217.1010 En ligne : https://drive.google.com/file/d/1xWFuLR2rebQGvEvcOAPTugJnSOoF0ibK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2698 [article]

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