Demystifying the two-sided role of inorganic halides in the structure and performance of Ziegler–Natta catalysts

Jandaghian, Mohammad Hossein; Maddah, Yasaman; Hosseini, Shahin; Eshaghzadeh, Fahimeh; Sepahi, Abdolhannan; Nikzinat, Ehsan; Masoori, Maryam; Bazgir, Hossein; Rashedi, Reza

doi:10.1039/d2me00126h

Cited by 10 publications

(8 citation statements)

References 64 publications

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“…The obtained XRD pattern of the adsorbent ranging from 4 to 70° at 2θ is shown in Figure . The crystal structure of the material is assessed by the intensity, and the peak intensity reflects the crystallinity framework of them . As can be seen, the main diffraction peaks of the molecular sieve around 2θ of 7, 12, 24, 26, 27, 30, 34, 41, 47, 52, 54, 58, 66, and 69° are distinguishable, and these sharp peaks reveal the presence of a highly crystalline structure.…”

Section: Resultsmentioning

confidence: 99%

Adsorptive Desulfurization of Condensate Contains Aromatic Compounds Using a Commercial Molecular Sieve

et al. 2023

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This study is undertaken to evaluate the potential of a commercial molecular sieve to remove diverse sulfur compounds from condensate with high aromatic on an industrial scale. For the first part of this study, the adsorbent is characterized in detail using inductively coupled plasma optical emission spectroscopy, X-ray diffraction, field-emission scanning electron microscopy, and Brunauer−Emmett−Teller analysis. For the second part, dynamic breakthrough experiments on an industrial scale are performed to assess the dynamic adsorption performance of a commercial molecular sieve. Dynamic experiments show that the adsorbent effectively removes the sulfur compound from condensate that has approximately 900 ppmw S. In more detail, this commercial molecular sieve selectively desulfurizes condensate to about 12 ppmw S, and this is achieved when the concentration of non-sulfur aromatic is greater than 15 times higher than the total sulfur. As regeneration is a crucial part of the continuous adsorption− regeneration cycling process, the final part of this study is focused on finding a desorption method to avoid a sulfur concentration peak in tail gas.

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Section: Resultsmentioning

confidence: 99%

Adsorptive Desulfurization of Condensate Contains Aromatic Compounds Using a Commercial Molecular Sieve

et al. 2023

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“…DSC is an important test by which molecular architecture of the polymers can be explained better 49,50 . DSC thermograms of sintered PEEK/Al and PEEK/Al samples for Al or Ti concentrations of 10, 20, 30, and 40 vol% before FWP are shown in Figure 8a.…”

Section: Resultsmentioning

confidence: 99%

“…DSC is an important test by which molecular architecture of the polymers can be explained better. 49,50 FWP are shown in Figure 8a. Figure 8b depicts the DSC thermograms of FW PEEK/Al-PEEK/Ti joint samples for same concentration of reinforcements Al-Ti of 10-10, 20-20, 30-30 and 40-40 vol%.…”

Section: Dsc Analysismentioning

confidence: 99%

Friction welding joint analysis of dissimilar nanocomposites: PEEK/aluminum to PEEK/titanium

Senkathir,

Pramanik,

Mukherjee

2023

J of Applied Polymer Sci

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Welding of dissimilar materials is extremely challenging to the researchers. In present work, for the first time, poly(ether ether ketone) (PEEK) based aluminum (Al), titanium (Ti) reinforced nanocomposites with varying reinforcements of 10, 20, 30, and 40 vol% were developed using powder metallurgy technology. Additionally, for the first time, the two dissimilar nanocomposites of PEEK/Al and PEEK/Ti were successfully welded by friction welding (FW) process to produce FW PEEK/Al‐PEEK/Ti nanocomposites with equal metallic reinforcements (viz., 10–40 vol% Ti or Al). The nanocomposites were characterized precisely and correlated by physical, microstructural, structural, thermal, and micromechanical tests. Crystallinity being a factor of melting temperature affects significantly the micromechanical characteristics influenced by reinforced particle‐concentrations. The FW PEEK/30Al‐PEEK/30Ti was found as best material since it showed highest nanohardness (0.652 GPa) and elastic modulus (15.902 GPa) in FW Joint at 40 mN compared to other FW nanocomposites. At the FW joint section, it was discovered that the reinforced particles were being transferred through an interdiffusion mechanism. Mobility of the nanoparticles was influenced by the concentration of the reinforced particles, which further modified the matrix's crystallization behavior and consequently influenced the FW nanocomposites' micromechanical properties. Therefore, the present work has suggested a feasible route for applying thermoplastic nanocomposites in the biomedical and aerospace industries.

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“…In adherence to a standard protocol, all utilized equipment underwent a double washing procedure with distilled water and subsequent drying at 115 C. Before polymerization, each piece of equipment received treatment with a solution of triethylaluminium (TEA, 25 wt% in toluene), followed by an extended nitrogen purge lasting multiple hours. 11,12 Rigorous precautions were implemented to guarantee the absence of oxygen or water during these processes.…”

Section: Methodsmentioning

confidence: 99%

Splitting for strength: Manipulating polymerization reactor split ratios to control mechanical and rheological properties in bimodal polyethylene resins

Jandaghian,

Sepahi,

Hosseini

et al. 2023

J of Applied Polymer Sci

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This study integrates advanced mathematical modeling and experimental methodologies to investigate the simultaneous impact of modifications in the split ratio and molecular weight (MW) of chains on the rheological and mechanical properties of bimodal polyethylene (BiPE) resins. The outcomes underscored the viability of fine‐tuning the molecular weight distribution (MWD) of a BiPE resin by augmenting the MW of high molecular weight (HMW) chains while simultaneously diminishing their proportion in the final alloy formulation. In addition, the experimental results illuminated the prospect of attaining a targeted melt flow index for the final polymers by elevating the MW of HMW chains alongside an increase in the proportion of low molecular weight chains. Significantly, these adjustments resulted in remarkable enhancements in the shear thinning index and strain hardening modulus of the fabricated resins.

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Demystifying the two-sided role of inorganic halides in the structure and performance of Ziegler–Natta catalysts

Abstract: Inorganic halide additives can act as dopants and/or chlorine-donating species in Ziegler–Natta recipes.

Cited by 10 publications

References 64 publications

Adsorptive Desulfurization of Condensate Contains Aromatic Compounds Using a Commercial Molecular Sieve

Adsorptive Desulfurization of Condensate Contains Aromatic Compounds Using a Commercial Molecular Sieve

Friction welding joint analysis of dissimilar nanocomposites: PEEK/aluminum to PEEK/titanium

Splitting for strength: Manipulating polymerization reactor split ratios to control mechanical and rheological properties in bimodal polyethylene resins

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