Effects of monomer length on α‐olefins polymerization using a conventional Ziegler–Natta catalyst

Shirbakht, Sedigheh; Mirmohammadi, Seyed Amin; Didehban, Khadijeh; Sadjadi, Samahe; Bahri‐Laleh, Naeimeh

doi:10.1002/adv.21934

Cited by 15 publications

(4 citation statements)

References 33 publications

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“…The decrease in oligomerization energy is due to the sterically hindered side chain, which affects oligomers formation. The exceptional behavior of octene has also been observed by Shirbakht and coworkers 56 . They have reported the effect of monomer length on polymerization of polyolefins using the Ziegler‐Natta catalyst 56 .…”

Section: Resultsmentioning

confidence: 59%

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First‐principles based theoretical investigation of impact of polyolefin structure on photooxidation behavior

et al. 2021

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Despite their mass production and large applications, polyolefins' stability and durability toward the air, moisture, and weather resistance is a challenge for the ecosystem. After long-term exposure to ultraviolet (UV) radiation or high-temperature or erosion, polyolefins undergo degradation generating microplastics (MPs). The MPs generated after the degradation of these polyolefins are hazardous for the ecosystem. In the present work, we have carried out density functional theory (DFT) studies to investigate the photodegradation of six different polyolefins ranging from polyethylene to polydecene, differing in side-chain. Herein, we have investigated photooxidized derivatives of different polyolefins and analyzed their relative stability, conformations, UV-visible spectral behavior, and carbonyl index. The photooxidized derivatives of various polyolefins formed during degradation are examined. The timedependent density functional theory analysis confirms that the carbonyl groups of photooxidized products show absorption peak in Infrared (IR) and visible region, acting as light-absorbing species. The relative stabilities of hydroperoxide formed during photo/thermal oxidation of different polyolefins have been evaluated to explain the degradation behavior. The oligomerization and stabilization energies of their corresponding hydroperoxide's were computed and analyzed to explain the degradation behavior of the polyolefins. The computed results suggest that polyolefins in their pristine state are stable toward photooxidation, but chemical impurities like carbonyl, unsaturated carbonyl, carboxylic acid, and hydroperoxide derivatives make them prone to undergo degradation, a fundamental process leading to generation of MPs. The comparative results confirmed that the side-chain length affects the stability and degradation of different polyolefins toward photooxidation.

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Section: Resultsmentioning

confidence: 59%

“…The exceptional behavior of octene has also been observed by Shirbakht and coworkers. 56 They have reported the effect of monomer length on polymerization of polyolefins using the Ziegler-Natta catalyst. 56 As seen from…”

Section: Oligomerization Energy Of Different Polyolefinsmentioning

confidence: 99%

First‐principles based theoretical investigation of impact of polyolefin structure on photooxidation behavior

et al. 2021

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“…In this study we focus on the backbone, in particular on the study of how the absence of ether bonds in the polymer matrix improves the chemical stability of anion exchange ionomers, synthesizing the copolymer poly(VBCl-co-hexene). We chose the Ziegler-Natta polymerization (ZNp) because this technique of polymerization is the most suitable for the synthesis of poly alpha-olefins [35] and co-polymerization of alpha-olefins with styrenic monomers [36]. It has also been employed for the homopolymerization of styrenic monomers [37].…”

Section: Introductionmentioning

confidence: 99%

Aliphatic Anion Exchange Ionomers with Long Spacers and No Ether Links by Ziegler–Natta Polymerization: Properties and Alkaline Stability

et al. 2022

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In this work we report the synthesis of poly(vinylbenzylchloride-co-hexene) copolymer grafted with N,N-dimethylhexylammonium groups to study the effect of an aliphatic backbone without ether linkage on the ionomer properties. The copolymerization was achieved by the Ziegler–Natta method, employing the complex ZrCl4 (THF)2 as a catalyst. A certain degree of crosslinking with N,N,N′,N′-tetramethylethylenediamine (TEMED) was introduced with the aim of avoiding excessive swelling in water. The resulting anion exchange polymers were characterized by 1H-NMR, FTIR, TGA, and ion exchange capacity (IEC) measurements. The ionomers showed good alkaline stability; after 72 h of treatment in 2 M KOH at 80 °C the remaining IEC of 76% confirms that ionomers without ether bonds are less sensitive to a SN2 attack and suggests the possibility of their use as a binder in a fuel cell electrode formulation. The ionomers were also blended with polyvinyl alcohol (PVA) and crosslinked with glutaraldehyde. The water uptake of the blend membranes was around 110% at 25 °C. The ionic conductivity at 25 °C in the OH− form was 29.5 mS/cm.

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“…Polymer blending is usually known as physical mixing of two or more homopolymers or copolymers to improve physical, mechanical (especially toughness), thermal and other important properties for particular applications [7][8][9][10][11][12]. Lots of polymers are available to enhance PLA properties like polyethylene glycol, polycarbonates (PCs), polystyrene, poly(ethylene-co-glycidylmethacrylate), polyethylene, polypropylene, polymethyl methacrylate, poly(acrylonitrile-butadiene-styrene), polyvinyl acetate, starch and so on [12,13].…”

Section: Introductionmentioning

confidence: 99%

Preparation of an enhanced nanohybrid alloy based on polylactic acid/polycarbonate/nanosilica

Irani-Kolash

Moshiri-Gomchi

Talebi-Liasi

et al. 2020

Plastics, Rubber and Composites

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In order to enhance properties of polylactic acid (PLA), its blend with polycarbonate (PC) and silica nanofiller were prepared and their properties were compared with neat PLA and PLA/ PC alloy. To have a better exchange reaction between PLA and PC and also an enhanced dispersion of nanosilica throughout the organic polymeric matrix, tin(II) 2-ethylhexanoate (TEH) and poly(ethylene-co-glycidyl methacrylate) (PEGM) were used as two different compatibilisers for the transesterification reactions between PLA, PC and nanosilica and chemical grafting of PEGM to PLA, PC and nanosilica. Performed analyses including X-ray diffraction, transmission electron microscopy, differential scanning calorimetry, melt flow index, tensile and thermogravimetric analysis demonstrated that although PEGM, which contains reactive epoxide groups, has a positive effect to promote the properties of its related nanohybrid, the best results were obtained in the presence of TEH as an effective coordination catalyst. Results showed that an enhanced industrial nanocomposite alloy can be fabricated with this efficient catalyst.

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Effects of monomer length on α‐olefins polymerization using a conventional Ziegler–Natta catalyst

Cited by 15 publications

References 33 publications

First‐principles based theoretical investigation of impact of polyolefin structure on photooxidation behavior

First‐principles based theoretical investigation of impact of polyolefin structure on photooxidation behavior

Aliphatic Anion Exchange Ionomers with Long Spacers and No Ether Links by Ziegler–Natta Polymerization: Properties and Alkaline Stability

Preparation of an enhanced nanohybrid alloy based on polylactic acid/polycarbonate/nanosilica

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