Causes of cracks in petaloid bottom of carbonated PET bottle / M.-Y. Lyu in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 1 (03/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 1 (03/2001) . - p. 72-78 Titre : Causes of cracks in petaloid bottom of carbonated PET bottle Type de document : texte imprimé Auteurs : M.-Y. Lyu, Auteur ; H. C. Kim, Auteur ; J. S. Lee, Auteur ; H. C. Shin, Auteur ; Y. Pae, Auteur Année de publication : 2001 Article en page(s) : p. 72-78 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Petaloid design in bottom for carbonated PET bottles is wide spread. Crack problems exist in the bottom of the bottles. Through this paper we investigated the causes of bottom crack. We examined the physical properties of material and tensile yield stress variations according to the stretch ratio of PET. Then we analyzed stretch ratio and strength in the bottom of blown bottles. We also performed crack tests to observe crack phenomena. The distribution of effective stress and maximum principal stress were examined by computer simulation to seek the influence of bottom design on crack. We concluded that the bottom crack occurs not only because of insufficient stretch of PET but also coarse design of petaloid bottom. The stretch ratio at bottom in bottle blowing should be higher than strain hardening point of PET to have enhanced mechanical strength. The crack in the bottom of PET bottles occurred through crazing. The maximum principal stress at valleys in the petaloid bottom of bottles was higher than the other area in the bottom and this maximum principal stress strongly affected the crack in the bottom of bottles. DOI : 10.3139/217.1628 En ligne : https://drive.google.com/file/d/17GeWmzVSAXjGBIgIDJOEDHC_hPkaDv4k/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15887 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001015	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Investigation of the mechanical properties and chemical resistance of PC/PBT/Impact modifier blends / M.-Y. Lyu in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 4 (12/2003)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 4 (12/2003) . - p. 382-387 Titre : Investigation of the mechanical properties and chemical resistance of PC/PBT/Impact modifier blends Type de document : texte imprimé Auteurs : M.-Y. Lyu, Auteur ; Y. Pae, Auteur ; C. Nah, Auteur Année de publication : 2003 Article en page(s) : p. 382-387 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Molding - Mechanical properties, flow characteristics and chemical resistance of polycarbonate (PC)/poly(butylene terephthalate) (PBT)/impact modifier (IM) blends were investigated over the wide composition range of PC and PBT. Mechanical properties of the PC/PBT/IM blends for two different IMs, butadiene based IM and butyl acrylate based IM, were studied. For the study of chemical resistance of the PC/PBT/IM blends, test specimens were dipped in solvent, thinner, and then variations of mechanical properties were analyzed. Tensile and flexural strengths were increased linearly and heat distortion temperature (HDT) also increased as PC content in the blends increased. Impact strength increased drastically as PC content in the blends increased up to 50wt.-%, and then it leveled out for over 50wt.-% of PC. Flowability of the blends decreased as PC content increased. Impact strengths of the blends were different from IMs specially at low temperatures. The blends with butyl acrylate based IM showed slightly higher impact strength than the blends with butadiene based IM at 0°C and room temperature. However, the blends with butadiene based IM showed remarkably higher impact strength than the blends with butyl acrylate based IM at the temperatures below 0°C. After the chemical treatment of test specimens, tensile and flexural strengths decreased, and impact strength increased as PC content in the blends increased. PC in the blends would become mild and ductile when it contacted with solvent, thus the impact strength increased while tensile and flexural strengths decreased. Note de contenu : - EXPERIMENTAL : Material and test specimen - Measurement of mechanical property and viscosity - Analysis of Morphology - Analysis of Chemical resistance - Results and discussion : Mechanical property and viscosity of the blends - Comparison of impact modifiers - Chemical resistance of the blends DOI : 10.3139/217.1756 En ligne : https://drive.google.com/file/d/1A38Jtw84qFUfzNo9Nactq20rIwykX6Dm/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15822 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001026	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 2 / 2)