Preparation and study of bi-supported Ziegler-Natta catalyst with nano graphene oxide and magnesium ethoxide supports for polymerization of polyethylene

Kheradmand, Amanj; Abadi, Ahmad Ramazani Saadat; Khorasheh, Farhad; Baghalha, Morteza; Bahrami, Hiva

doi:10.1134/s156009041603009x

Cited by 5 publications

(9 citation statements)

References 26 publications

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“…According to the literature, materials that have hydroxyl groups on their surface can be used as suitable bases for the Ziegler-Natta catalyst. 23,59 Furthermore, the depicted absorbance bonds including the bending vibration of NH 2 (3273 cm −1 ), asymmetric vibration, and bending vibration of the Si O Si network (1120 and 614 cm −1 ) and Si OH (1073 cm −1 ) shown in Figure 2(c) confirm the presence of silane molecules grafted on the GO nanosheets surface. 61,66 GO(SiO 2 )-UHMWPE Nanocomposites Characterization VAMW Measurement.…”

Section: Go(sio 2 ) Nanohybrids Characterizationmentioning

confidence: 68%

“…As shown in Figure (c), there are various absorbance peaks including CH 2  (2930 cm −1 ), CO (1747 cm −1 ), C=C (1640 cm −1 ), and a strong OH peak at 3400 cm −1 indicating the carboxyl and hydroxyl groups presented on the GO nanosheets surface. According to the literature, materials that have hydroxyl groups on their surface can be used as suitable bases for the Ziegler–Natta catalyst …”

Section: Resultsmentioning

confidence: 99%

“…In addition, UHMWPE chains in GOSPE‐0 sample have considerable interactions in the form of physical entanglements . Consequently, opening of these physical entanglements and rearrangement of the chains through the tensile test occurs at higher elongations than for the nanocomposite samples.…”

Section: Resultsmentioning

confidence: 99%

“…Synthesis of Mg(OEt) 2 /GO(SiO 2 )-supported Ziegler-Natta catalyst was performed based on our method presented our previous publications. 31,32,42,59 A brief description is provided here. GO(SiO 2 ) (5 g) and Mg(OEt) 2 (2 g) were added into a flask.…”

Section: Zeigler-natta Catalysts Preparationmentioning

confidence: 99%

“…The in situ ethylene monomers polymerization was carried out according to the procedure presented in our previous publications. 31,32,42,59 A 1 L Buchi reactor (Versoclave; BUCHI AG, Flawil, Switzerland) was degassed using argon (1.1 bar pressure) at 90 C to move out the impurities and humidity remained in the reactor. Then, n-hexane (400 mL) and TIBA were syringed into the reactor under stirring.…”

Section: In Situ Polymerization Of Go(sio 2 )-Uhmwpe Nanocompositesmentioning

confidence: 99%

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SiO₂‐covered graphene oxide nanohybrids for in situ preparation of UHMWPE/GO(SiO₂) nanocomposites with superior mechanical and tribological properties

Haddadi

Ramazani

Kheradmand

et al. 2019

J of Applied Polymer Sci

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The modified Hummer technique was used in the preparation of graphene oxide (GO) nanosheets, and then SiO2 decorated GO [GO(SiO2)] nanosheets were synthesized via the sol–gel method. Then, ultrahigh‐molecular‐weight polyethylene (UHMWPE) nanocomposites loaded with 0.5, 1, 1.5, and 2 wt % of GO(SiO2) were prepared using magnesium ethoxide/GO(SiO2)‐supported Ziegler–Natta catalysts via the in situ polymerization. Morphological study of the prepared polymer powders was assessed using field‐emission scanning electron microscopy, which showed that GO(SiO2) nanohybrids have been uniformly dispersed and distributed into the UHMWPE matrix. Also, the neat UHMWPE and its nanocomposites were evaluated with different analyses, including viscosity‐average molecular weight measurement, differential scanning calorimetry, thermogravimetric analysis, tensile test, scratch hardness, and pin‐on‐disk test. The characterization of the UHMWPE nanocomposites indicated that many characterizations, including the mechanical, thermal, and tribological properties of UHMWPE, were significantly improved by incorporation of these new nanosheets in spite of the molecular weight reduction of the polymeric matrix and the improved flowability and processability of the produced nanocomposite. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47796.

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Section: Go(sio 2 ) Nanohybrids Characterizationmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Zeigler-natta Catalysts Preparationmentioning

confidence: 99%

Section: In Situ Polymerization Of Go(sio 2 )-Uhmwpe Nanocompositesmentioning

confidence: 99%

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SiO₂‐covered graphene oxide nanohybrids for in situ preparation of UHMWPE/GO(SiO₂) nanocomposites with superior mechanical and tribological properties

Haddadi

Ramazani

Kheradmand

et al. 2019

J of Applied Polymer Sci

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Effect of exfoliated molybdenum disulfide oxide on friction and wear properties of ultra high molecular weight polyethylene

Amini

Ramazani

Varjouy

et al. 2018

Polymers for Advanced Techs

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The aim of this work is to investigate the effect of molybdenum disulfide on tribological properties of Ultra-high-molecular-weight polyethylene (UHMWPE). UHMWPE/ MoS 2 nano-composites were prepared using in-situ polymerization and Ziegler-Natta catalytic system. Studies showed that, in order to obtain the optimum tribological properties, interlayer distance between nanosheets should be as high as possible.Therefore, the nanosheets were subjected to oxidation using the required oxidants followed by thermal shock and ultrasound. Fourier-transform infrared spectroscopy (FTIR) analysis was used to determine the formation of functional groups which indicate the formation of S═O bond in the molybdenum disulfide oxide. Then, in order to exfoliate and increase the interlayer distance of nanosheets, thermal shock and ultrasonic were conducted Field Emission Scanning Electron Microscopy (FESEM) analyses. Finally, the obtained sample was used as the second support of catalyst in in-situ polymerization process. Then, under specified and constant operational conditions, the synthesis of samples containing 0.5%, 1%, and 2% nanoparticles were conducted. The results of the morphological study with FESEM indicate that the filler is uniformly distributed in the matrix, and X-ray Powder Diffraction (XRD) analysis showed that completely exfoliated nanocomposites were resulted and in low nanoparticle content. Addition of MoS 2 as reinforcing agent had a significant effect on friction coefficient of the nanocomposites. With the addition of 0.5 wt% of MoS 2 , the friction coefficient declined by approximately 35%. Furthermore, negligible decrease in sample's weight after the wear test is an indication of a strong interaction between MoS 2 and the matrix. Scratch resistance test revealed that with the addition of filler, the resistance increased from 23 to 60 MPa.

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Synthesis and evaluation of a new three-metallic high-performance Ziegler–Natta catalyst for ethylene polymerization: experimental and computational studies

et al. 2021

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Preparation and study of bi-supported Ziegler-Natta catalyst with nano graphene oxide and magnesium ethoxide supports for polymerization of polyethylene

Cited by 5 publications

References 26 publications

SiO₂‐covered graphene oxide nanohybrids for in situ preparation of UHMWPE/GO(SiO₂) nanocomposites with superior mechanical and tribological properties

SiO₂‐covered graphene oxide nanohybrids for in situ preparation of UHMWPE/GO(SiO₂) nanocomposites with superior mechanical and tribological properties

Effect of exfoliated molybdenum disulfide oxide on friction and wear properties of ultra high molecular weight polyethylene

Synthesis and evaluation of a new three-metallic high-performance Ziegler–Natta catalyst for ethylene polymerization: experimental and computational studies

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Preparation and study of bi-supported Ziegler-Natta catalyst with nano graphene oxide and magnesium ethoxide supports for polymerization of polyethylene

Cited by 5 publications

References 26 publications

SiO2‐covered graphene oxide nanohybrids for in situ preparation of UHMWPE/GO(SiO2) nanocomposites with superior mechanical and tribological properties

SiO2‐covered graphene oxide nanohybrids for in situ preparation of UHMWPE/GO(SiO2) nanocomposites with superior mechanical and tribological properties

Effect of exfoliated molybdenum disulfide oxide on friction and wear properties of ultra high molecular weight polyethylene

Synthesis and evaluation of a new three-metallic high-performance Ziegler–Natta catalyst for ethylene polymerization: experimental and computational studies

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Product

Resources

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SiO₂‐covered graphene oxide nanohybrids for in situ preparation of UHMWPE/GO(SiO₂) nanocomposites with superior mechanical and tribological properties

SiO₂‐covered graphene oxide nanohybrids for in situ preparation of UHMWPE/GO(SiO₂) nanocomposites with superior mechanical and tribological properties