Influence of uniaxial extension on the mechanical properties of PET and PEN films / J. H. Wang in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 1 (03/2008)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIII, N° 1 (03/2008) . - p. 17-23 Titre : Influence of uniaxial extension on the mechanical properties of PET and PEN films Type de document : texte imprimé Auteurs : J. H. Wang, Auteur ; J. H. Kim, Auteur ; H. J. Kang, Auteur ; F. E. Talke, Auteur Année de publication : 2008 Article en page(s) : p. 17-23 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Films plastiques -- Propriétés mécaniques Polyéthylène naphtalate Polyéthylène téréphtalate Index. décimale : 668.9 Polymères Résumé : The modulus and hardness of poly(ethylene terephthalate)-(PET) and poly(ethylene naphthalate)(PEN) films are studied as a function of the uniaxial draw ratio using nanoindentation and macro-scale tensile testing equipment. Nanoindentation tests were conducted in the machine-transverse plane, the transvers-normal plane, and the machine-normal plane of the PET and PEN films to determine mechanical properties (hardness and modulus of elasticity) of the uniaxially stretched films at the nano-scale. The films were then re-tested using a tensile tester to determine the modulus on the macro-scale. The results from the two methods show large differences. Birefringence measurements indicate that the macro-scale and nano-scale moduli are strongly influenced by the chain orientation after uniaxial stretching. In addition, the influence of chain orientation is found to be much larger on the macro-scale than on the nano-scale. DOI : 10.3139/217.1002 En ligne : https://drive.google.com/file/d/1KPZxPsTGSWHcTKs1Af5Np4No01oiOWx6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2656 [article]

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Tubular film extrusion stability of metallocene linear low density polyethylene / K. Kim in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 1 (03/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 1 (03/2006) . - p. 81-85 Titre : Tubular film extrusion stability of metallocene linear low density polyethylene Type de document : texte imprimé Auteurs : K. Kim, Auteur ; H. J. Kang, Auteur Année de publication : 2006 Article en page(s) : p. 81-85 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Extrusion Métallocènes Polyéthylène basse densité linéaire Index. décimale : 668.9 Polymères Résumé : The bubble stability of tubular film extrusion in metallocene linear low density polyethylene(m-LLDPE) and metallocene linear low density polyethylene/linear low density polyethylene( m-LLDPE/LLDPE) blend was investigated. Unstable bubble characteristics in m-LLDPE were found at low draw down ratio (DR) with a symmetric periodic bubble instability at low blow up ratio (BUR) and a helical instability at high blow up ratio. However, m-LLDPE showed better operation windows in tubular film extrusion than that of LLDPE, especially in bubble instability at low BUR. Both bubble instability and helical instability in LLDPE tubular film extrusion were enhanced by the blending with m-LLDPE. m-LLPE possesses higher melt elasticity as compared to m-LLDPE and LLDPE due to the long chain branching introduced by 1-octene co-monomer during polymerization. Blending resulted in broadening of molecular weight distribution (MWD) and thus increase in activation energy. DOI : 10.3139/217.0077 En ligne : https://drive.google.com/file/d/1903LcU-R_J0e-SWDIb3wxnqzTqqVRCom/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2932 [article]

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