Regulation of alkoxysilane on stereoregular polymerization of Butene-1 catalyzed by TiCl4/MgCl2 Ziegler-Natta catalysts

Zheng, Wenjie; Zhao, Yuanjin; Han, Meichen; Zhou, Chengsi; He, Aihua

doi:10.1016/j.polymer.2021.123925

Cited by 8 publications

(4 citation statements)

References 48 publications

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“…For both conventional MgCl 2 /TiCl 4 catalyst and POSS-MgCl/TiCl 4 catalyst, the addition of the external electron donor caused a slight diminution of the catalytic activity compared to the polymerization system without the external electron donor (entry 1 vs 2 and entry 7 vs 8). This phenomenon is the same as the decrease in polymerization activity of conventional Ziegler–Natta catalysts with the addition of an external electron donor reported by other researchers in previous reports, − which is mainly due to the coordination of external electron donor with alkylaluminum, which reduces the activity of TEA.…”

Section: Resultssupporting

confidence: 85%

Preparation of Polyhedral Oligomeric Silsesquioxane-Supported Ziegler–Natta Catalyst and Its Application for Stereoselective Propylene Polymerization

Yan,

Huang,

et al. 2024

ACS Appl. Polym. Mater.

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In this study, a polyhedral oligomeric silsesquioxane (POSS)-MgCl bisupported TiCl 4 catalyst was synthesized through the treatment of trisilanolisobutyl POSS with Grignard reagent, followed by anchoring TiCl 4 . The resulting catalyst could catalyze the propylene polymerization with very high activity after activation by a cocatalyst. Meanwhile, it is noteworthy that, as the cage structure of POSS contains a silicone ether structure, the isotactic index of the obtained polypropylene (PP) exceeds 90%, even in the absence of an electron donor. Additionally, because of the uniform dispersion of POSS in the PP matrix during polymerization and good interfacial compatibility, the obtained PP/POSS nanocomposites possess not only excellent thermal stability but also excellent mechanical properties. Therefore, a high-activity catalytic propylene stereoselective polymerization catalyst was developed and provided a feasible method for the fabrication of high-performance PP/POSS nanocomposites.

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Section: Resultssupporting

confidence: 85%

Preparation of Polyhedral Oligomeric Silsesquioxane-Supported Ziegler–Natta Catalyst and Its Application for Stereoselective Propylene Polymerization

Yan,

Huang,

et al. 2024

ACS Appl. Polym. Mater.

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“…[51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66] Similar deconvolution studies were used to understand the effect of polymerization conditions and catalyst formulations for the polymerization of ethylene and α-olefins with Ziegler-Natta [67][68][69][70][71][72][73][74][75][76][77][78][79][80][81] and Phillips/chromium catalysts. [82][83][84] Other studies used MWD deconvolution to identify active site populations for the polymerization of 1-octene, [85] 1-hexene, [86][87][88][89] and 1-butene [90,91] with Ziegler-Natta catalysts. An alternative MWD deconvolution algorithm, using the cumulative version of Flory distribution, has also been proposed but has not been widely adopted.…”

Section: Looking Back At the Literaturementioning

confidence: 99%

Polyolefin microstructural deconvolution methods: The good, the bad, and the ugly

Soares

2023

Can J Chem Eng

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The deconvolution of the molecular weight distribution (MWD) of polyolefins into Schultz–Flory most probable distributions has become the standard method to identify the number of site types on multiple‐site‐type olefin polymerization catalysts such as Ziegler–Natta, Phillips, and some supported metallocenes. This method has been used to quantify the effect of polymerization conditions and catalyst formulations on polyolefin MWD and olefin polymerization kinetics. Related methods have also been developed to deconvolute other polyolefin microstructure features, such as the chemical composition and comonomer sequence length distributions. In this paper, I explain the premises behind these deconvolution models and review the publications in this area, highlighting the advantages, disadvantages, and misuses of these methods. I also propose a revised formulation on how to model the MWD of polyolefins made with multiple‐site‐type catalysts using ratio distributions for propagation and chain transfer frequencies. The main objective of this overview article is to highlight the strengths, but also show the pitfalls, of polyolefin microstructure deconvolution methods.

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“…Butenes are important raw materials for synthetizing masses of industrial chemicals (such as 1,3-butadiene [1] and acetic acid [2]) and polymers (such as linear low density polyethylene and atactic polypropylene [3,4]). Meanwhile, butenes are the typical gaseous pollutants in petrochemical waste gas, which are unwanted byproducts in dehydrogenation and unreacted monomers in polyreactions.…”

Section: Introductionmentioning

confidence: 99%

The Decomposition of Dilute 1-Butene in Tubular Multilayer Dielectric Barrier Discharge Reactor: Performance, By-Products and Reaction Mechanism

Zhu

Wang

et al. 2023

Processes

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Butene is a typical component of exhaust gas in the petrochemical industry, the emission of which into the atmosphere would lead to air pollution. In this study, a tubular multilayer dielectric barrier discharge (TM-DBD) reactor was developed to decompose 1-butene at ambient pressure. The experimental results show that a decomposition efficiency of more than 99% and COx selectivity of at least 43% could be obtained at a specific energy density of 100 J/L with an inlet concentration of 1-butene ranging from 100 to 400 ppm. Increasing the volume ratio of O2/N2 from 0 to 20% and the specific energy density from 33 to 132 J/L were beneficial for 1-butene destruction and mineralization. Based on organic byproduct analysis, it was inferred that the nitrogenous organic compounds were the main products in N2 atmosphere, while alcohol, aldehyde, ketone, acid and oxirane were detected in the presence of O2. In addition, the contents of formaldehyde, acetaldehyde, ethyl alcohol, acetic acid and propionic acid increased with an increase in specific energy density, but the contents of propionaldehyde, ethyl oxirane, butyraldehyde and formic acid decreased. Three main pathways of 1-butene destruction were proposed involving Criegee intermediates and ozonolysis of the olefins, and the following degradation could be the dominant pathways rather than epoxidation. Overall, the developed TM-DBD system paved the way for scaling up the applications of plasma technology for gaseous pollutant decomposition.

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Regulation of alkoxysilane on stereoregular polymerization of Butene-1 catalyzed by TiCl4/MgCl2 Ziegler-Natta catalysts

Cited by 8 publications

References 48 publications

Preparation of Polyhedral Oligomeric Silsesquioxane-Supported Ziegler–Natta Catalyst and Its Application for Stereoselective Propylene Polymerization

Preparation of Polyhedral Oligomeric Silsesquioxane-Supported Ziegler–Natta Catalyst and Its Application for Stereoselective Propylene Polymerization

Polyolefin microstructural deconvolution methods: The good, the bad, and the ugly

The Decomposition of Dilute 1-Butene in Tubular Multilayer Dielectric Barrier Discharge Reactor: Performance, By-Products and Reaction Mechanism

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