Polyethylene nanocomposite prepared by a metallocene catalyst supported on MMT using a new pretreatment method

Hakim, Shokoufeh; Safajou-Jahankhanemlou, Majid; Zeynali, Mohammad Ebrahim

doi:10.1007/s10965-013-0129-1

Cited by 5 publications

(4 citation statements)

References 21 publications

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“…At temperature range between 200 and 350 ∘ C, PE/clay nanocomposite degraded slower than pure PE observed from the lower weight loss percentage, whereas the nanocomposite with 20 wt% of clay loading exhibited faster degradation. The weight loss at this temperature range is related mainly to the organic surface modifier degradation and also the degradation of remained MAO that cannot participate in the polymerizations [9]. In effect, the nanocomposite with 20 wt% of clay loading, which naturally has the highest content of the organic surface modifiers among all the samples and also has the highest content of the remained inactive MAO due to the lowest catalytic activity, thus degraded fastest in this temperature range.…”

Section: Dispersion Of Nanoclaymentioning

confidence: 97%

“…For enhancing the adhesion between two phases, modification of nanoclay with appropriate agent is usually used for this purpose. Hakim et al [9] investigated clay nanoplatelets treated (modified) with ammonia and dodecylamine at different conditions in the in situ ethylene polymerization system with metallocene catalyst (Cp 2 ZrCl 2 ). It was found that the treated clays provided the higher catalytic activity than the untreated clays.…”

Section: Introductionmentioning

confidence: 99%

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Polyethylene/Clay Nanocomposites Produced by In Situ Polymerization with Zirconocene/MAO Catalyst

Panupakorn

Chaichana

Praserthdam

et al. 2013

Journal of Nanomaterials

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Two commercial nanoclays were used here as catalytic fillers for production of polyethylene (PE) and linear low-density polyethylene (LLDPE) nanocomposites viain situpolymerization with zirconocene/MAO catalyst. It was found that both types of nanoclays designated as clay A and clay B can improve thermal stability to the host polymers as observed from a thermal gravimetric analysis (TGA). The distribution of the clays inside the polymer matrices appeared good due to thein situpolymerization system into which the clays were introduced during the polymer forming reaction. Upon investigating the clays by X-ray diffractometer (XRD) and Fourier transform infrared spectroscopy (FTIR), it was observed that the crucial differences between the two clays are the crystallite sizes (A < B) and the amounts of amine group (A < B). The higher amount of amine group in clay B was supposed to be a major reason for the lower catalytic activity of the polymerization systems compared to clay A resulting from its deactivating effect on zirconocene catalyst. However, for both clays, increasing their contents in the polymerization systems reduced the catalytic activity due to the higher steric hindrance occurring.

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Section: Dispersion Of Nanoclaymentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Polyethylene/Clay Nanocomposites Produced by In Situ Polymerization with Zirconocene/MAO Catalyst

Panupakorn

Chaichana

Praserthdam

et al. 2013

Journal of Nanomaterials

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“…In polymer-layered silicate nanocomposite systems, the proper addition of layered silicates leads to a great improvement in the properties of the matrix such as thermal stability and mechanical performance [8,9]. For insulating dielectric material, experiments have proven that the addition of an appropriate amount of montmorillonite (MMT) to silicone rubber, polypropylene, polyethylene, and ethylene-vinyl acetate (EVA) produces the nanocomposite with improved ability to inhibit electrical tree development as well as enhanced breakdown strength and heat resistance [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Improved Electric Strength and Space Charge Characterization in LDPE Composites with Montmorillonite Fillers

Liao

Bai

Yang

et al. 2013

Journal of Nanomaterials

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Space charge distribution and breakdown strength were investigated in composites of low density polyethylene (LDPE) and various contents of montmorillonite (MMT). The disperse performance of MMT in LDPE was observed with scanning electron microscopy (SEM) and X-ray diffraction. For MMT concentration of 1 wt%, the better intercalation of LDPE into MMT interlayers and the tighter interface structure between polymer-filler were observed, relative to MMT concentration of 3 and 5 wt%. Space charge profiles were obtained using the pulsed electroacoustic (PEA) method. Less space charge accumulated in the LDPE/MMT with MMT content of 1 wt% than that in pure LDPE, and space charge in the central of LDPE/MMT was much more uniformly. On the other hand, when MMT concentration was up to 3 and 5 wt%, large amounts of heterocharges were accumulated in the sample bulk. In MMT doped samples the dielectric strength increased up to a maximum at 1 wt% loading, and then decreases at 3 and 5 wt%.

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“…Thus, it is interesting to see how the nanoclay improves the various properties further with the help of a compatibilizer. Only limited work on mPE/clay nanocomposites was reported recently [9][10][11][12][13][14][15][16][17][18][19] . Kuo et al 9 found that the incorporation of nanoclay into the mPE matrix could increase the crystallization rate.…”

Section: Introductionmentioning

confidence: 99%

Effect of Clay Types on the Properties of Silane Compatibilzied Metallocene Polyethylene/Clay Nanocomposites

Chen

Lai

Yang

et al. 2015

Polymers and Polymer Composites

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The interaction between the intercalant within clay and the compatibilizer is essential to the properties of nanocomposites, and the compatibilizer properties are often neglected. In this work, we have deliberately used a low crystallinity polyolefin elastomer as a compatibilizer to investigate if the inferior mechanical properties of the compatibilizer compared with those of the matrix would counteract the effects of high dispersion of clay in the mPE/clay systems. Melt-mixed mPE (metallocene polyethylene)/clay nanocomposites were thus prepared using a low-crystallinity polyolefin elastomer (mPE-g-silane) as a compatibilizer under two different types of commercial clay (Cloisite 20A and 30B) with different organic affinities to mPE-g-silane, to investigate both intercalant and compatibilizer effects. According to X-ray diffraction and transmission electron microscopy analyses, all 20A-filled nanocomposites showed fairly well-dispersed clay within the mPE matrix in comparison with 30B-filled cases due to a larger d-spacing of 20A for easier access of the compatibilizer, even though a higher affinity between 30B and the compatibilizer was expected. Measurable gel content was observed for 20A-filled systems, but not for 30B-filled systems. Tensile properties and tear strength of 20A-filled samples were higher than those of 30B-filled samples, again due to the high dispersion effect in 20A-filled samples. Thus, the affinity of 20A clay with silane agent was quite essential for these compatibilized mPE/clay systems, despite of the weak mechanical properties of the compatibilizer. Clearly, a subtle balance of the interfacial interaction, interface properties and clay dispersion is essential to attain the good mechanical properties of mPE/clay nanocomposites.

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Polyethylene nanocomposite prepared by a metallocene catalyst supported on MMT using a new pretreatment method

Cited by 5 publications

References 21 publications

Polyethylene/Clay Nanocomposites Produced by In Situ Polymerization with Zirconocene/MAO Catalyst

Polyethylene/Clay Nanocomposites Produced by In Situ Polymerization with Zirconocene/MAO Catalyst

Improved Electric Strength and Space Charge Characterization in LDPE Composites with Montmorillonite Fillers

Effect of Clay Types on the Properties of Silane Compatibilzied Metallocene Polyethylene/Clay Nanocomposites

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