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Effect of nanoclay surface modifier chemical reactivity on morphology and rheological properties of PP/PA6 blend nanocomposite / G. R. Pircheraghi in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 4 (08/2013)
[article]
Titre : Effect of nanoclay surface modifier chemical reactivity on morphology and rheological properties of PP/PA6 blend nanocomposite Type de document : texte imprimé Auteurs : G. R. Pircheraghi, Auteur ; Hossein Nazockdast, Auteur ; M. M. Salehi, Auteur Année de publication : 2013 Article en page(s) : p. 354-360 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères
Argile
Cations
DiamineUne diamine est un type de polyamine contenant exactement deux groupes amine. Les diamines sont principalement utilisées comme monomères pour synthétiser des polyamides, des polyimides et des polyurées. La principale diamine produite est le 1,6-diaminohexane, précurseur du Nylon 6-6, suivie de l'éthylènediamine1. L'hydrazine (H2NNH2) n'est en général pas considérée comme une diamine puisque ce n'est ni une amine (pas de carbone), ni une dibase.
Morphologie (matériaux)
Nanoparticules
Polyamide 6
Polypropylène
Rhéologie
Traîtements de surfaceIndex. décimale : 668.4 Plastiques, vinyles Résumé : An attempt was made to explore the role of nanoclay surface modifier chemical reactivity on the morphology and the rheological properties of a polypropylene/polyamide6 (PP/PA6 75/25) nanocomposite blend. The Na-MMT surface was modified with two types of cations; a) diamine cation (D-Clay), and b) a combination of diamine and quaternary alkylammonium cations (A-Clay) via cation exchange reaction. The „nanocomposites samples compatibilized with PP-g-MA were prepared by melt compounding in an internal mixer. The XRD patterns indicated the intercalated/exfoliated microstructure for both nanocomposite samples. The SEM results showed a significant decreases in the PA6 droplet size, from 3.2?m of the simple blend to the 0.4?m in the D-Clay containing sample. Moreover, in the sample containing A-Clay the average droplet size was found to be 1?m. The D-Clay containing sample showed the rheological properties similar to a simple blend in high frequencies with a nonterminal be„havior in low frequencies storage modulus. This was explained by locating of D-Clay layers in the interphase and hence, significantly reducing the effective interfacial tension, ?/R. In contrast, the sample containing A-Clay showed an increased complex viscosity and storage modulus within a range of frequencies, which was attributed to presence of a large amount of A-Clay layers in the PP matrix. These types of nanoclay partitioning were explained by the possibility of chemical reaction between amine group of nanoclay surface modifier and maleic group of PP-g-MA compatibilizer or in-situ formed block copolymer. Consequently, the D-Clay layers bounded with PP-g-MA is preferentially located in the interphase, while, the non reactive nanoclay layers (containing alkylammonium cations) is dispersed in the PP matrix by assistance of PP-g-MA. These findings were also evidenced by TEM micrograph of both nanocomposite samples. Note de contenu : - EXPERIMENTAL/MODELING/SIMULATION : Materials - Na-MMT surface modification - Nanocomposite preparation
- CHARACTERIZATIONDOI : 10.3139/217.2680 En ligne : https://drive.google.com/file/d/1_UVNJId8hAvNEJDYdeG9PJdPTXD622Ly/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19279
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 4 (08/2013) . - p. 354-360[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15396 - Périodique Bibliothèque principale Documentaires Disponible The role of organoclay on in-situ microfibril formation of epoxy in poly(butylene terephtalate) nanocomposites / M. M. Salehi in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 2 (05/2013)
[article]
Titre : The role of organoclay on in-situ microfibril formation of epoxy in poly(butylene terephtalate) nanocomposites Type de document : texte imprimé Auteurs : M. M. Salehi ; Hossein Nazockdast ; G. R. Pircheraghi Année de publication : 2013 Article en page(s) : p. 199-206 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile
Epoxydes
Extrusion filage
Fibrillation
Matériaux hybrides
Matières plastiques -- Extrusion:Polymères -- Extrusion
Polybutylène téréphtalateIndex. décimale : 668.9 Polymères Résumé : The main objective of the present work was to study the role of organoclay on the microfibrillation process of epoxy phase in Poly(butylene terephtalate), PBT, matrix both in presence and absence of epoxy curing agent. The PBT/epoxy blend samples with constant blend ratio (60/40) were prepared by melt mixing in a twin screw extruder. The elongational flow imposed by drawing the extrudate at the die exit permitted controlled generation of fibrile morphology of the dispersed epoxy phase, with a fiber diameter of 0.8 lm and an aspect ratio greater than 100. It was shown that when the curing agent was added into the extruder, its reactivity with epoxy at high temperature was high enough and selectively affected on the epoxy phase. The SEM results showed smaller epoxy droplet size for samples containing nanoclay compared to simple blends. This could be explained in terms of hindrance effect of nanoclay in reducing the coalescence as a dominating parameter due to presence of nanoclay in both phases. These results were supported by the melt linear viscoelastic results which showed enhanced low frequency viscosity and storage modulus for these samples. Addition of nanoclay was found to have little effect on extent of fibrillation epoxy droplet in stretched samples. The rheological results obtained for stretched samples showed very strong increase in low frequency solid body response whose extent was increase with increasing draw ratio. This mainly attributed to special 3-D network formed between microfibrils whose shape was stabilized by either presence of nanoclay or accelerated curing process of fibrillated epoxy. From SEM micrographs and linear viscoelastic measurements it can be deduced that curing process has small changes on the extent of fibrillation epoxy droplet in stretched samples. But it leads to improvement of interfacial interaction between two phases in the nanocomposites. Note de contenu : - EXPERIMENTAL/MODELING/SIMULATION : Materials - Sample preparation - Sample characterization
- RESULTS AND DISCUSSION : Residence time distribution in extruder and kinetics of epoxy curing - PBT/epoxy blendsDOI : 10.3139/217.2681 En ligne : https://drive.google.com/file/d/1LutPvUwI20tFsaMar7vQOg7LG7x8AM5O/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18433
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 2 (05/2013) . - p. 199-206[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15050 - Périodique Bibliothèque principale Documentaires Disponible