Synthesis of highly spherical Ziegler–Natta catalyst by employing Span 80 as an emulsifier suitable for UHMWPE production

Rezaeian, Amin; Hanifpour, Ahad; Teimoury, Hamid reza; Nekoomanesh‐Haghighi, Mehdi; Ahmadi, Mostafa; Bahri‐Laleh, Naeimeh

doi:10.1007/s00289-022-04122-4

Cited by 13 publications

(9 citation statements)

References 49 publications

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“…In the current study, 11 MgCl 2 .nEtOH adducts (Add‐1 to Add‐11) were prepared via melt quenching method under different conditions of Table 1, according to our previously reported procedure 39 . The so‐called method belongs to the chemical activation category, employed for the treatment of natural MgCl 2 34 .…”

Section: Resultsmentioning

confidence: 99%

“…In the current study, 11 MgCl 2 .nEtOH adducts (Add-1 to Add-11) were prepared via melt quenching method under different conditions of Table 1, according to our previously reported procedure. 39 The so-called method belongs to the chemical activation category, employed for the treatment of natural MgCl 2 . 34 In the melt quenching method, MgCl 2 is dissolved in ethanol, followed by the regeneration of support particles in an oil media, which eventually undergo thermal deallocation to furnish desired MgCl 2 .nEtOH adducts.…”

Section: Analysis Of the Synthesized Adducts And Related Catalystsmentioning

confidence: 99%

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Effect of adduct synthesis parameters on the ethylene polymerization kinetics of Ziegler Natta catalysts

Nouri-Ahangarani

Bahri‐Laleh

Abedini

et al. 2023

J of Applied Polymer Sci

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Here, it is aimed to clarify the structure-performance relationship in MgCl 2 based Ziegler Natta catalysts toward ethylene polymerizations. In this regard, 11 different adduct precursors were prepared through industrially appreciated melt quenching method employing various: (i) reaction times for dissolving magnesium chloride inside ethanol; (ii) ethanol/MgCl 2 molar ratios in the feed; (iii) heating rates during thermal dealcoholation; (iv) N 2 flows during thermal dealcoholation and (v) alcohol content after thermal dealcoholation. Among the studied parameters, heating rate and N 2 flow during thermal dealcoholation have the most pronounced effect on the porosity and particle size of the resulted adducts. Related Ziegler Natta catalysts were subsequently employed in ethylene polymerizations. According to the kinetic curves, catalyst productivity and form of kinetic curve (as decay or build-up type) can be precisely tailored by proper choosing of the mentioned variables during adduct synthesis. Microstructure analysis of the prepared polyethylenes reveals that alcohol content in the final adduct has the most significant effect on the H 2 response, in terms of molar mass and its distribution, of the related Ziegler Natta catalysts. The overall results help polyethylene producers in choosing proper reaction conditions during adduct synthesis for the production of different polymer grades, when productivity or H 2 response is targeted.

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Section: Resultsmentioning

confidence: 99%

Section: Analysis Of the Synthesized Adducts And Related Catalystsmentioning

confidence: 99%

Effect of adduct synthesis parameters on the ethylene polymerization kinetics of Ziegler Natta catalysts

Nouri-Ahangarani

Bahri‐Laleh

Abedini

et al. 2023

J of Applied Polymer Sci

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“…It has been proved that using metal halides increases the degree of comonomer incorporation and improves the distribution of comonomers within polymeric chains. [60][61][62][63][64][65][66][67][68][69][70][71][72][73]…”

Section: Elemental Analysismentioning

confidence: 99%

Clarifying the effects of comonomer distribution between short and long chains on physical and mechanical properties of ethylenic copolymers

Jandaghian

Sepahi²,

Hosseini³

et al. 2022

Polymer Engineering & Sci

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In this paper, two Zigler‐Natta catalysts (ZNCs) were used to synthesize a commercially available linear low‐density polyethylene (LLDPE), widely used in the packaging industry, on an industrial scale. The catalysts differ only in their ability to distribute comonomers between short and long chains. Both catalysts were fully characterized in the first section, and two similar ethylene/1‐butene copolymers were made using them. Afterward, the produced copolymers were fully characterized using different techniques; namely, differential scanning calorimetry (DSC), successive self‐nucleation and annealing (SSA), oxygen induction time (OIT), melt flow index (MFI), rheometric mechanical spectroscopy (RMS), and a wide range of mechanical experiments. It was revealed that while the presence of comonomers in short chains can reduce their resistance against oxidation (by more than 30%) and can cause a dramatic change in friction coefficients (by more than 20%), some of the other main mechanical properties of the made copolymers were independent of comonomer distribution between long and short chains. In addition, it was shown that ethylenic copolymers' strain hardening modulus (SHM) takes advantage of the homogenous distribution.

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“…This preference is grounded in the remarkable capacity of BiPE resins to offer a diverse spectrum of mechanical and physical properties. 1,2 The production of BiPE resins involves various processes, yielding final products comprising two distinct categories of chains with specific functions. The ethylenic homopolymers, constituting the majority of low molecular weight (LMW) chains in the resin, play a crucial role in regulating the ease with which the molten polymer can be processed due to their notably low viscosity.…”

Section: Introductionmentioning

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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Synthesis of highly spherical Ziegler–Natta catalyst by employing Span 80 as an emulsifier suitable for UHMWPE production

Cited by 13 publications

References 49 publications

Effect of adduct synthesis parameters on the ethylene polymerization kinetics of Ziegler Natta catalysts

Effect of adduct synthesis parameters on the ethylene polymerization kinetics of Ziegler Natta catalysts

Clarifying the effects of comonomer distribution between short and long chains on physical and mechanical properties of ethylenic copolymers

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

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