Ethylene Polymerization
Ethylene Polymerization - Related Videos
07:28
Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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2015
A protocol for the high-throughput analysis of polymerization catalyst, chain transfer polymerizations, polyethylene characterization, and reaction kinetic analysis is presented.
04:20
Investigating the Bacterial Response to Ethylene Using an Ethylene-Releasing Compound
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2025
Source: Augimeri, R. V. et. al., Utilizing the Ethylene-releasing Compound, 2-Chloroethylphosphonic Acid, as a Tool to Study Ethylene Response in Bacteria. J. Vis. Exp. (2016)This video demonstrates the effect of ethylene generated by 2-chloroethylphosphonic acid (CEPA) on bacterial growth and cellulose production. Ethylene activates signaling pathways that stimulate cellulose synthesis, resulting in enhanced pellicle formation. These results highlight the bacterial response to ethylene.
08:51
Utilizing the Ethylene-releasing Compound, 2-Chloroethylphosphonic Acid, as a Tool to Study Ethylene Response in Bacteria
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Cited by 1 •
2016
The protocols outlined herein facilitate the convenient investigation of bacterial ethylene responses by utilizing 2-chloroethylphosphonic acid (CEPA). Ethylene is produced in situ through the decomposition of CEPA in an aqueous bacterial growth medium, circumventing the requirement for pure ethylene gas.
15:33
Microwave-assisted Functionalization of Poly(ethylene glycol) and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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Cited by 32 •
2013
This video will illustrate a rapid, efficient method to methacrylate poly(ethylene glycol), enabling chain polymerizations and hydrogel synthesis. It will demonstrate how to similarly introduce methacrylamide functionalities into peptides, detail common analytical methods to assess functionalization efficiency, provide suggestions for troubleshooting and advanced modifications, and demonstrate typical hydrogel characterization techniques.
08:56
Catalytic Reactor: Hydrogenation of Ethylene
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2023
Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA The hydrogenation of ethylene (C2H4) to ethane (C2H6) has often been studied as a model reduction reaction in characterizing new metal catalysts.1-2 While supported nickel is not the most active metal catalyst for this reaction, it is active enough that reaction can take place at < 200°C. The reaction typically involves adsorbed, dissociated hydrogen (H2) reacting...
FAQs
During chain growth, the catalyst activates ethylene’s carbon-carbon double bond, creating a reactive site where another monomer can attach. Repeated additions extend the polymer chain rather than producing a small molecule as a byproduct. This mechanism explains why changes in catalyst behavior can alter chain length and the resulting polyethylene structure.
Catalyst selection and reaction conditions influence how polymer chains form and develop. These variables can change branching, molecular weight, and overall chain structure, which in turn affect material properties. Controlling them allows chemists to produce polyethylene with characteristics suited to different uses instead of obtaining one uniform material for every application.
Coordination catalysts and high-pressure radical conditions provide two distinct industrial routes for linking ethylene molecules. Their different reaction environments influence the architecture of the resulting polyethylene, including branching and molecular weight. Comparing these routes helps chemists connect processing conditions with material behavior and select an approach for a desired polyethylene grade.
Industrial production uses either coordination-catalyst processes or high-pressure radical conditions. In both approaches, ethylene molecules are linked into polymer chains, but the selected route affects chain architecture and therefore the final material properties. This process choice supports production of multiple polyethylene grades rather than a single material with limited performance.
Branching and molecular weight are important structural features because they influence polyethylene’s material properties. Adjusting catalyst type and reaction conditions changes these features, allowing the polymer to range from flexible materials used in films to more rigid forms used in containers and engineering components. The architecture therefore connects molecular control with practical performance.
Polyethylene grades support applications in packaging, construction, electrical insulation, and engineering components. Flexible grades can serve film applications, while more rigid grades can support containers and structural or technical uses. Studying the polymerization process helps chemists tailor chain structure and improve manufacturing efficiency for these varied application requirements.