Effect of nanoclay addition on morphology and elastomeric properties of dynamically vulcanized natural rubber/polypropylene nanocomposites / Natinee Lopattananon in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 3 (07/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 3 (07/2014) . - p. 332-341 Titre : Effect of nanoclay addition on morphology and elastomeric properties of dynamically vulcanized natural rubber/polypropylene nanocomposites Type de document : texte imprimé Auteurs : Natinee Lopattananon, Auteur ; S. Tanglakwaraskul, Auteur ; A. Kaesaman, Auteur ; M. Seadan, Auteur ; T. Sakai, Auteur Année de publication : 2014 Article en page(s) : p. 332-341 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères -- propriétés mécaniques Argile Caoutchouc Matériaux hybrides Mélanges-maîtres (chimie) Montmorillonite Nanoparticules Polypropylène Vulcanisation Index. décimale : 668.4 Plastiques, vinyles Résumé : Thermoplastic vulcanizate (TPV) nanocomposites based on 60/40 (%wt) natural rubber (NR)/polypropylene (PP) blends were prepared by melt blending in an internal mixer. Sodium montmorillonite (Na-MMT) was first added in natural rubber latex to obtain natural rubber/clay masterbatch, which was subsequently dynamically crosslinked while mixing with molten PP. The effect of Na-MMT content were examined concerning elastomeric properties of NR/PP blends dynamically vulcanized using phenolic resin as a curing agent. Morphology characterization observed by X-ray diffraction (XRD), transmission electron microscopy (TEM) and 3D microfocus X-ray computerized tomography showed that the dynamic vulcanization with nanoclay addition changed the blend morphology from a co-continuous-like structure to droplet-like phase one, and the clay remained within NR phase in intercalated and aggregated forms. Furthermore, the presence of clay induced the decrease in crosslinking of NR, but promoted the mixing between NR and PP during dynamic vulcanization. This suggested that nanoclay worked as a kind of morphology modifier during dynamic vulcanization. The addition of clay marginally enhanced the 100 % modulus and tensile strength, but led to the decrease of the elongation at break. The optimal level of tensile strength improvement was obtained with loading of 5 phr clay. The permanent set of the NR/PP/Clay TPV nanocomposites was well maintained at the acceptable level as elastomer. The resistances to oil and heat were improved with incorporation of clay, proportional to clay loading. The experimental results indicated that the nanoclay had a positive effect on improving the 60/40 NR/PP blend morphology, which provided a little benefit to strength of the TPVs. However, the addition of nanoclay offered an improvement in oil and thermal resistances due to a combined effect of the clay dispersion and improved morphology of NR and PP blends. Note de contenu : - EXPERIMENTAL : Materials - Preparation of TPV/clay nanocomposites - Characterization - RESULTS AND DISCUSSION : Dispersion of clay - Morphology of TPV/clay nanocomposites - Gel content of TPV/clay nanocomposites - Mechanical properties - Thermal stability - Oil swelling DOI : 10.3139/217.2935 En ligne : https://drive.google.com/file/d/1HcHWGqwmS10eZ3v8TTRo7EW18iPCsGxZ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21730 [article]

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Effects of zinc salts of sulfonated natural rubber on mechanical properties, morphology and compatibility of natural rubber/chlorosulfonated polyethylene blends / Natinee Lopattananon in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 4 (09/2007)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 4 (09/2007) . - p. 359-367 Titre : Effects of zinc salts of sulfonated natural rubber on mechanical properties, morphology and compatibility of natural rubber/chlorosulfonated polyethylene blends Type de document : texte imprimé Auteurs : Natinee Lopattananon, Auteur ; M. Seadan, Auteur ; K. Boonsong, Auteur Année de publication : 2007 Article en page(s) : p. 359-367 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Rubbery ionomer based on zinc salt of sulfonated natural rubber (Zn-SNR) was employed as a new compatibilizer to prepare blends of natural rubber (NR) and chlorosulfonated polyethylene (CSM) with different compositions by melt mixing process. Epoxidized natural rubber (ENR), known as an effective compatibilizer for such blends, was also incorporated into the blends. The role of ionomer and ENR on NR/CSM blend properties and morphology was evaluated by mean of tensile measurement, oil resistance testing, DMTA and SEM. The tensile properties and oil resistance of the blends were found to increase with respect to CSM content, and increased further on compatibilization with Zn-SNR and ENR. The blends compatibilized with Zn-SNR showed a similar or higher level of improvement in tensile strength and elongation at break as compared to those of ENR. The tensile strength for all of the compatibilized blends was greater than that of corresponding neat blends by 23 to 113 %. The mechanism for enhancing in tensile properties of the blends using the Zn-SNR compatibilizing agent has been proposed. The observation of DMTA and SEM showed that the blends were two-separated phase morphology. However, the addition of Zn-SNR to NR/CSM blends resulted in promoted compatibility as indicated by a shift in the tan d peak of CSM to lower temperature, a reduction in dispersed phase size and better adhesion between NR and CSM. These results demonstrated that the Zn-SNR is a new reactive compatibilizer for NR and CSM blends. DOI : 10.3139/217.2011 En ligne : https://drive.google.com/file/d/1vgejgzPAukGW74B8cyA7tZDzsLNwd6Tl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2699 [article]

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Sustainable biocomposites from rice flour and sisal fiber : effect of fiber loading, length and alkali treatment / Natinee Lopattananon in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 3 (07/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 3 (07/2009) . - p. 272-279 Titre : Sustainable biocomposites from rice flour and sisal fiber : effect of fiber loading, length and alkali treatment Type de document : texte imprimé Auteurs : Natinee Lopattananon, Auteur ; S. Songkaew, Auteur ; W. Throngruang, Auteur ; M. Seadan, Auteur Année de publication : 2009 Article en page(s) : p. 272-279 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Rice flour was modified with water and glycerol in single-screw extruder to obtain bioplastic of low manufacturing cost. Sisal fibers were used as reinforcing fillers to enhance rice flour-based bioplastic properties. The effects of short sisal fiber content (5 to 20 wt.%), length (0.2 to 6 mm) and alkali treatment (5% w/v NaOH) on the moisture content, tensile properties, impact properties, dynamic mechanical properties and morphology of the biocomposites were studied. The results showed that incorporation of the sisal fibers with a fixed fiber length into the bioplastics improved moisture resistance, tensile strength, impact strength and storage modulus, and that the improvement level increased with increasing sisal fiber content. The optimum reinforcement was achieved at 20 wt.% of fiber loading and 4 mm long fibers. The tensile strength of the biocomposite was about 4 times more than that of the neat rice flour-based bioplastic. The use of 5% NaOH aqueous solution further improved the moisture resistance and mechanical properties of the biocomposites, mainly resulting from better interfacial adhesion between the sisal fiber and rice flour matrix. Furthermore, the performance of the rice flour-based bioplastics synergistically combined with the sisal fibers suggests that they have great potential in development of environmentally friendly/sustainable biomaterial products from renewable resources. DOI : 10.3139/217.2258 En ligne : https://drive.google.com/file/d/11HsL34pDVKYtoIC6-Q7rgBTJwRxRlDIQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5931 [article]

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