Modelling of phase transitions and residual thermal stress of CTBN rubber modified epoxy resins during a pultrusion process / L. Calabrese in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 2 (05/2007)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 2 (05/2007) . - p. 132-139 Titre : Modelling of phase transitions and residual thermal stress of CTBN rubber modified epoxy resins during a pultrusion process Type de document : texte imprimé Auteurs : L. Calabrese, Auteur ; A. Valenza, Auteur Année de publication : 2007 Article en page(s) : p. 132-139 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The implicit finite difference and fourth order Runge-Kutta method are used both to solve the heat transfer problem in the pultrusion reaction and to calculate the temperature and conversion distributions within a thermoset composite profile. The aim of our work is to study the influence of a rubbery phase added to the epoxy matrix in production conditions. The results have shown that the rubber modified systems have a low exothermic temperature peak value, so that neither the amount of cured resin nor the final product properties are limited. First of all we will show that the phase transition (gelation and vitrification) zones within the die change as the amount of rubber varies in the resin. The relationship between the position and of these zones and the resin systems will be discussed. We calculate the residual thermal stresses for all the investigated fibre/resin systems, showing a reduction when the rubber amount increases in the epoxy blend. DOI : 10.3139/217.0133 En ligne : https://drive.google.com/file/d/1mePqFXQ4P2_cZeSYT1aYWwd24RvHRPLA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2751 [article]

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Solidification behaviour of PA6/iPP blends at high cooling rates / C. Colletti in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 1 (03/2000)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XV, N° 1 (03/2000) . - p. 46-52 Titre : Solidification behaviour of PA6/iPP blends at high cooling rates Type de document : texte imprimé Auteurs : C. Colletti, Auteur ; S. Piccarolo, Auteur ; A. Valenza, Auteur Année de publication : 2000 Article en page(s) : p. 46-52 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The non isothermal crystallization behaviour of two model blends of immiscible polymers (an isotactic polypropylene and a polyamide-6) was examined by a quenching procedure within a range of cooling rates from 0.1 to above 1000°C/s in order to emulate the solidification conditions arising during polymer processing. The final structure of the blends was analyzed by density and WAXD and the transition from stable to metastable phases in the blends and the pure homopolymers was compared examining their dependence on cooling rate. This shows that crystallization in the blends is always faster since the transitions move to larger cooling rates. Observation of morphological details suggests that this can be due to enhanced nucleation at the interface. The density variation in the case of the polyamide-6 rich blend is larger than expected from an additive volume contribution which may be ascribed to development of microvoids at the interface. In the case of the isotactic polypropylene rich blend the additive volume contribution is consistent with experimental observations. DOI : 10.3139/217.1573 En ligne : https://drive.google.com/file/d/1pckF6tJ1S6jgy56fTmLPcvOsHVP6VOfl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16073 [article]

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