PP/clay nanocomposites: Effect of clay treatment on morphology and dynamic mechanical properties

Kodgire, Pravin; Kalgaonkar, Rajendra; Hambir, Sangeeta; Bulakh, Neelima; Jog, J. P.

doi:10.1002/app.1611.abs

Cited by 41 publications

(51 citation statements)

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“…The T −10% also showed a similar improvement to that of the T −5% . A similar improvement in thermal stability has already been reported, not only for PP/organoclay nanocomposites,39–41 but also for other polymer/organoclay nanocomposite systems, such as polystyrene nanocomposites, poly(dimethyl siloxane) (PDMS) nanocomposites, poly(methyl methacrylate) (PMMA) nanocomposites, poly(ethylene terephthalate) (PET) nanocomposites, etc 42…”

Section: Resultssupporting

confidence: 76%

“…The improvement in the thermal stability for polymer/organoclay nanocomposites is due to the formation of char which hinders the ‘out‐diffusion’ of the volatile decomposition products, as a direct result of the decrease in permeability. The latter decrease is usually observed in intercalated or exfoliated clay platelets in the polymer/organoclay nanocomposites 39, 42. According to Ray and Okamoto,42 the significant increases in the thermal stabilities of polymer/organoclay nanocomposites result from the exfoliated clay platelets retarding the diffusion of oxygen into the polymer matrix.…”

Section: Resultsmentioning

confidence: 86%

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Morphology, thermal and mechanical behavior of polypropylene nanocomposites toughened with poly(ethylene‐co‐octene)

Lim

Hassan

Rahmat

et al. 2006

Polymer International

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Rubber‐toughened polypropylene (PP) nanocomposites containing organophilic layered silicates were prepared by means of melt extrusion at 230 °C using a co‐rotating twin‐screw extruder in order to examine the influence of the organoclay and the addition of PP grafted with maleic anhydride (PPgMAH) as a compatibilizer on the morphological, mechanical and thermal properties. The mechanical properties of rubber‐toughened polypropylene nanocomposites (RTPPNCs) were studied through tensile, flexural and impact tests. Scanning electron microscopy (SEM) was used for investigation of the phase morphology and rubber particles size. X‐ray diffraction (XRD) was employed to characterize the formation of nanocomposites. The thermal properties were investigated by using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The dynamic mechanical properties were examined by using dynamic mechanical analysis (DMA). From the tensile and flexural tests, the optimum loading of organoclay in RTPP was found to be 6 wt%. The optimum loading of PPgMAH, based on the tensile and flexural properties, was also 6 wt%. The increase in the organoclay and PPgMAH content resulted in a severe embrittlement, manifested by a drop in the impact strength and tensile elongation at break. XRD studies revealed that intercalated RTPPNCs had been successfully prepared where the macromolecular PP segments were intercalated into the interlayer space of the organoclay. In addition, the organoclay was dispersed more evenly in the RTPPNC as the PPgMAH content increased. TGA results revealed that the thermal stability of the RTPPNC improved significantly with the addition of a small amount of organoclay. Copyright © 2006 Society of Chemical Industry

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Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 86%

Morphology, thermal and mechanical behavior of polypropylene nanocomposites toughened with poly(ethylene‐co‐octene)

Lim

Hassan

Rahmat

et al. 2006

Polymer International

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“…The data are tabulated in Table 1 and shown graphically in Fig. The enhanced thermal stability of the polymer/clay nanocomposites is attributed to the lower permeability of oxygen and the diffusibility of the degradation products from the bulk of the polymer caused by the exfoliated clay in the composites [21,22,23]. As seen in Fig.…”

Section: Tga Characterization Of Nanocompositesmentioning

confidence: 99%

Influence of Electron Beam Irradiation on PP/Clay Nanocomposites Prepared by Melt Blending

et al. 2007

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In this research, the melt blending technique was used to prepare various polypropylene (PP) based nanocomposites. A commercial organoclay (denoted 15A) served as the filler for PP matrix, and the maleic anhydride modified PP was used as compatibilizer. The specimens were subjected to electron beam (EB) irradiation. The purpose of the study focuses on the influences of EB irradiation on the thermal stability and mechanical properties of the nanocomposites. The morphology of the nanocomposites was studied using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD and SEM results showed that these nanocomposites are best described as intercalated systems. PP/Clay nanocomposites showed good thermal stability in the TGA analysis. TGA data at 500KGy showed that the EB irradiation has negative effect on thermal stability of the nanocomposites. Mechanical testing showed that the EB irradiation strongly influences the mechanical properties (tensile strength, Young's modulus and hardness) of PP/Clay nanocomposites. The value of tensile strength decreases remarkably for all specimens with increasing irradiation dose up to about 550 KGy, but this reduction for nanocomposites with 3% clay is less than that of the pure PP/PP-g-MA blend. In higher irradiation doses, reduction in tensile strength of PP nanocomposites is less than that of the pure PP/PP-g-MA blend. Optimum irradiation dose of Young's modulus for PP/Clay nanocomposites with 5% clay is 450 KGy. The hardness of the nanocomposites with 5% clay was found to decrease with increase in irradiation dose.

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“…6,7 The effects of two kinds of treatments of clay are discussed. Maleic anhydride (MAH) grafted PP is used as a compatibiliser.…”

Section: Polypropylene (Pp)mentioning

confidence: 99%

Crystallisation in polymer nanocomposites

Jog¹

2006

Materials Science and Technology

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Polymer nanocomposites are of interest as they exhibit extraordinary properties compared with the base polymer. The second phase dispersed in the polymer matrix can be carbon nanotubes, semi-conducting inorganic nanoparticles or layer silicates such as clay. Crystallisation in these materials is also of great interest. Polymers exhibit structures at various scales (e.g. lamella, unit cell and spherulites) and the presence of a second phase has a profound effect on crystallisation. General trends observed include acceleration/retardation of crystallisation, changes in spherulite morphology and, in a few cases, changes in the crystal structure. All these observations relate to the presence of a micrometre scale second phase. However, when the dimensions of the second phase are close to the chain dimensions, the effects on crystallisation become particularly interesting. An attempt is made in the present review to address the effect of a nanoscale second phase on aspects such as isothermal and non-isothermal crystallisation, spherulite growth, phase transformation and polymorphism.

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PP/clay nanocomposites: Effect of clay treatment on morphology and dynamic mechanical properties

Cited by 41 publications

References 0 publications

Morphology, thermal and mechanical behavior of polypropylene nanocomposites toughened with poly(ethylene‐co‐octene)

Morphology, thermal and mechanical behavior of polypropylene nanocomposites toughened with poly(ethylene‐co‐octene)

Influence of Electron Beam Irradiation on PP/Clay Nanocomposites Prepared by Melt Blending

Crystallisation in polymer nanocomposites

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